🦀 Rust EtherNet/IP Driver

A high-performance, production-ready EtherNet/IP communication library specifically designed for Allen-Bradley CompactLogix and ControlLogix PLCs. Built in pure Rust with focus on PC applications, offering exceptional performance, memory safety, and comprehensive industrial features.

📦 Available on crates.io

🎯 Current Development Focus

We are currently focusing on polishing the .NET stack (C# wrappers and examples) to production quality.

🎯 Active Development:
- C# wrapper library (RustEtherNetIp.dll)
- WinForms example application
- WPF example application
- ASP.NET example application
- Advanced features: TagGroup, Statistics, Batch Operations, STRING support, UDT arrays
⏸️ On Hold:
- Go wrapper and applications (will resume after .NET stack is complete)
- Python wrapper and applications (will resume after .NET stack is complete)

This focused approach ensures we deliver a robust, well-tested, production-ready .NET integration before expanding to other language ecosystems. The .NET stack serves as the reference implementation for future language bindings.

🎯 Project Focus

This library is specifically designed for:

Allen-Bradley CompactLogix (L1x, L2x, L3x, L4x, L5x series)
Allen-Bradley ControlLogix (L6x, L7x, L8x series)
PC Applications (Windows, Linux, macOS)
Industrial Automation software and SCADA systems
High-performance data acquisition and control

✅ v0.6.0 New Features

🔧 Generic UDT Format: New UdtData struct with symbol_id and raw bytes
- Works with any UDT without requiring prior knowledge of member structure
- Supports reading and writing UDTs generically
- Enables parsing UDT members using UDT definitions when needed
📊 Array Element Access: Full read/write support for array elements using intelligent workaround
- Controller-scoped arrays: gArrayTest[0], gArrayTest[1], etc.
- Program-scoped arrays: Program:MainProgram.ArrayTest[0]
- BOOL array support: Automatic DWORD bit extraction for BOOL arrays
- Automatic detection and workaround for array element access
✍️ Array Element Writing: Write individual array elements with automatic array modification
- Reads entire array, modifies element, writes back seamlessly
- Supports all data types (DINT, REAL, BOOL, etc.)
- Works with both controller-scoped and program-scoped arrays
✅ Library Health: All 31 unit tests passing, production-ready core library

✅ v0.5.4 Features

🔍 UDT Definition Discovery: Automatic UDT structure detection from PLC
🏷️ Enhanced Tag Discovery: Full attribute support with permissions and scope
📦 Packet Size Negotiation: Dynamic optimization for firmware 20+
🛣️ Route Path Support: Slot configuration and multi-hop routing
💾 Cache Management: Smart caching for UDT definitions and tag attributes
🔧 CIP Services: Full implementation of Services 0x03 and 0x4C
🎯 Program Tag Support: Fixed program-scoped tag access with correct CIP path format
🧠 Enhanced UDT Parsing: Intelligent multi-member UDT parsing with byte alignment detection
⚡ Advanced Chunked Reading: Multiple strategies for large UDTs with intelligent error recovery
🎯 .NET Stack Focus: Comprehensive C# wrapper with WinForms, WPF, and ASP.NET examples

🎉 Major Milestone Achieved!
v0.6.0 introduces a new generic UDT format (UdtData) that works with any UDT without requiring prior knowledge of member structure. The library core is production-ready with all 31 unit tests passing.

✨ Key Features

🔍 UDT Discovery & Management (v0.5.4)

Automatic UDT Structure Detection: No more manual offset/size/type specifications
CIP Service 0x03: Get Attribute List for comprehensive tag metadata
CIP Service 0x4C: Read Tag Fragmented for large data structures
Smart Caching: UDT definitions and tag attributes cached for performance
Template Management: Full UDT template parsing and member discovery
Program-Scoped Discovery: Find tags within specific program scopes

🛣️ Route Path Support (v0.5.4, Enhanced in v0.6.0)

Slot Configuration: Support for slots 0-31 (✅ Fully implemented and tested)
Backplane Routing: Direct communication with CPUs in different slots (✅ Fully implemented)
Network Routing: Multi-hop routing through network addresses and ports (✅ Implemented)
CIP Path Building: Automatic CIP route path byte generation (✅ Implemented)
ControlLogix Support: Tested with ControlLogix systems with CPUs in different slots
Remote Rack Connections: Basic support exists, needs additional testing
Dynamic Path Building: Automatic CIP route path generation from slots, ports, and addresses

📦 Packet Size Optimization (v0.5.4)

Dynamic Negotiation: Automatically negotiates optimal packet size with PLC
Firmware 20+ Support: Enhanced performance for modern PLCs
Adaptive Sizing: Adjusts packet size based on PLC capabilities
Performance Boost: 20-30% improvement for large data transfers

🧠 Enhanced UDT Processing ✅ NEW in v0.5.4

Intelligent Multi-Member Parsing: Automatically detects and parses multiple UDT members (DINT, DINT, REAL)
Byte Alignment Detection: Smart alignment detection with reasonableness checks
Advanced Chunked Reading: Multiple strategies for large UDTs with intelligent error recovery
Cross-Language Support: All improvements work seamlessly across Rust, Go, and C# wrappers
Performance Optimized: Sub-5ms response times for complex UDT operations

🔧 Connection Robustness

Automatic session management with proper registration/unregistration
Connection health monitoring with configurable timeouts
Network resilience handling for industrial environments
Comprehensive error handling with detailed CIP error mapping

⚠️ Known Limitations

The following operations are not supported due to PLC firmware restrictions. These limitations are inherent to the Allen-Bradley PLC firmware and cannot be bypassed at the library level.

STRING Tag Writing

Cannot write directly to STRING tags (e.g., gTest_STRING, Program:TestProgram.gTest_STRING).

Root Cause: PLC firmware limitation (CIP Error 0x2107). The PLC rejects direct write operations to STRING tags, regardless of the communication method used.

What Works:

✅ Reading STRING tags: gTest_STRING (read successfully)
✅ Reading STRING members in UDTs: gTestUDT.Member5_String (read successfully)

What Doesn't Work:

❌ Writing simple STRING tags: gTest_STRING (write fails - PLC limitation)
❌ Writing program-scoped STRING tags: Program:TestProgram.gTest_STRING (write fails - PLC limitation)
❌ Writing STRING members in UDTs directly: gTestUDT.Member5_String (write fails - must write entire UDT)

Workaround for STRING Members in UDTs: If the STRING is part of a UDT structure, you can write it by reading the entire UDT, modifying the STRING member in memory, then writing the entire UDT back:

// Read entire UDT
let mut udt = client.read_tag("gTestUDT").await?;

// Modify STRING member in memory (if UDT structure is known)
// ... modify UDT structure ...

// Write entire UDT back
client.write_tag("gTestUDT", udt).await?;

Note: For standalone STRING tags (not part of a UDT), there is no workaround at the communication library level. Alternative approaches may include using PLC ladder logic or other PLC-side mechanisms to update STRING values.

UDT Array Element Member Writing

Cannot write directly to members of UDT array elements (e.g., gTestUDT_Array[0].Member1_DINT).

Root Cause: PLC firmware limitation (CIP Error 0x2107). The PLC does not support direct write operations to individual members within UDT array elements.

What Works:

✅ Reading UDT array element members: gTestUDT_Array[0].Member1_DINT (read successfully)
✅ Writing entire UDT array elements: gTestUDT_Array[0] (write full UDT structure)
✅ Writing UDT members (non-array): gTestUDT.Member1_DINT (write individual members of non-array UDTs)
✅ Writing simple array elements: gArray[5] (write elements of simple arrays like DINT[], REAL[], etc.)

What Doesn't Work:

❌ Writing UDT array element members: gTestUDT_Array[0].Member1_DINT (write fails - PLC limitation)
❌ Writing program-scoped UDT array element members: Program:TestProgram.gTestUDT_Array[0].Member1_DINT (write fails - PLC limitation)

Workaround: Use a read-modify-write pattern:

// Read entire UDT array element
let mut element = client.read_tag("gTestUDT_Array[0]").await?;

// Modify member in memory (if UDT structure is known)
// ... modify UDT structure ...

// Write entire UDT array element back
client.write_tag("gTestUDT_Array[0]", element).await?;

Summary of Limitations

Test Results (392 tags tested):

✅ 333/392 tags (84.9%) successfully read and written
❌ 59/392 tags failed due to PLC firmware limitations:
- 55 tags: UDT array element member writes (e.g., gTestUDT_Array[0].Member1_DINT)
- 2 tags: Simple STRING tag writes (e.g., gTest_STRING)
- 2 tags: STRING member writes in UDTs (e.g., gTestUDT.Member5_String)

Important Notes:

These limitations are PLC firmware restrictions, not library bugs
The library correctly implements the EtherNet/IP and CIP protocols
All read operations work correctly for all tag types
Workarounds are available for UDT array element members and STRING members in UDTs
Standalone STRING tag writes have no workaround at the communication library level

📚 For detailed technical information about these limitations, including official Rockwell documentation references and technical background, see AB_String_UDT_Write_Limitations.md.

📍 Advanced Tag Addressing ✅ COMPLETED

Program-scoped tags: Program:MainProgram.Tag1 ✅ FIXED in v0.5.4
Array element access: MyArray[5], MyArray[1,2,3] ✅ WORKING in v0.5.5
- Automatic workaround: Reads entire array and extracts element
- Supports read and write operations
- Works with controller-scoped and program-scoped arrays
- Special handling for BOOL arrays (DWORD bit extraction)
Bit-level operations: MyDINT.15 (access individual bits)
UDT member access: MyUDT.Member1.SubMember
String operations: MyString.LEN, MyString.DATA[5]
Complex nested paths: Program:Production.Lines[2].Stations[5].Motor.Status.15

📊 Complete Data Type Support ✅ COMPLETED

All Allen-Bradley native data types with proper CIP encoding:

BOOL - Boolean values (CIP type 0x00C1)
SINT - 8-bit signed integer (-128 to 127, CIP type 0x00C2)
INT - 16-bit signed integer (-32,768 to 32,767, CIP type 0x00C3)
DINT - 32-bit signed integer (-2.1B to 2.1B, CIP type 0x00C4)
LINT - 64-bit signed integer (CIP type 0x00C5)
USINT - 8-bit unsigned integer (0 to 255, CIP type 0x00C6)
UINT - 16-bit unsigned integer (0 to 65,535, CIP type 0x00C7)
UDINT - 32-bit unsigned integer (0 to 4.3B, CIP type 0x00C8)
ULINT - 64-bit unsigned integer (CIP type 0x00C9)
REAL - 32-bit IEEE 754 float (CIP type 0x00CA)
LREAL - 64-bit IEEE 754 double (CIP type 0x00CB)
STRING - Variable-length strings (CIP type 0x00DA)
UDT - User Defined Types with full nesting support (CIP type 0x00A0)

🔗 Language Bindings

C# Integration 🎯 CURRENT FOCUS - Active Development

Complete C# wrapper with all data types
22 FFI functions for seamless integration
Type-safe API with comprehensive error handling
Cross-platform support (Windows, Linux, macOS)
Production-ready examples: WinForms, WPF, ASP.NET
Advanced features: TagGroup, Statistics, Batch Operations, STRING support
Status: Actively being polished to production quality

Go Integration ⏸️ ON HOLD

CGO wrapper with comprehensive API coverage
Type-safe Go bindings for all PLC data types
Connection management and health monitoring
Error handling with Go-idiomatic patterns
Full-stack example with Go backend + Next.js frontend (see example)
Status: Development paused until .NET stack is complete

Python Integration ⏸️ ON HOLD

PyO3-based Python wrapper with full API coverage
Type-safe Python bindings for all PLC data types
Synchronous and asynchronous APIs for flexible usage
Comprehensive error handling with Python exceptions
Easy installation via pip or maturin
Cross-platform support (Windows, Linux, macOS)
Status: Development paused until .NET stack is complete

⚠️ Comprehensive Error Handling ✅ COMPLETED

Detailed CIP error mapping with 40+ error codes
Network-level diagnostics and troubleshooting
Granular error types for precise error handling
Automatic error recovery for transient issues

🏗️ Build System ✅ COMPLETED

Automated build scripts for Windows and Linux/macOS
Cross-platform compilation with proper library generation
Comprehensive testing with 30+ unit tests
CI/CD ready with GitHub Actions examples

⚡ Real-Time Subscriptions ✅ NEW in v0.4.0

Real-time tag monitoring with configurable update intervals (1ms - 10s)
Event-driven notifications for tag value changes
Multi-tag subscriptions supporting hundreds of concurrent monitors
Automatic reconnection and error recovery
Memory-efficient engine with minimal CPU overhead

🚀 High-Performance Batch Operations ✅ NEW in v0.4.0

Batch read operations - read up to 100+ tags in a single request
Batch write operations - write multiple tags atomically
Parallel processing with concurrent execution
Transaction support with rollback capabilities
2,000+ ops/sec throughput with intelligent packet packing

🏭 HMI/SCADA Production Demo

Experience a professional-grade HMI dashboard showcasing real-world industrial data tracking and monitoring capabilities. This demo demonstrates the library's potential for building production-ready SCADA systems and industrial dashboards.

HMI/SCADA Production Demo

🎯 Demo Features

📊 Real-time Production Monitoring - Live production counts, targets, and progress tracking
📈 OEE Analysis - Overall Equipment Effectiveness with availability, performance, and quality metrics
🌡️ Process Parameters - Temperature, pressure, vibration monitoring with color-coded alerts
⚙️ Machine Status - Real-time machine state, shift information, and operator tracking
🔧 Maintenance Management - Scheduled maintenance tracking and history
📱 Responsive Design - Works seamlessly on desktop, tablet, and mobile devices

🚀 Perfect for Demonstrations

This demo showcases:

High-frequency data collection (1-second intervals)
Professional HMI aesthetics with industrial-grade visualizations
Real-world metrics that matter to production managers
Scalable architecture for larger SCADA systems
Modern web technologies for cross-platform deployment

🏷️ Required PLC Tags

The demo reads 13 industrial tags including machine status, production metrics, process parameters, and OEE data. See the Go + Next.js example for complete tag specifications and setup instructions.

Try it now: Navigate to the "HMI Demo" tab in the Go + Next.js fullstack example!

🚀 Performance Characteristics

Optimized for PC applications with excellent performance:

🆕 Latest Performance Improvements (v0.6.0)

Recent optimizations and improvements:

Generic UDT Format: New UdtData struct enables universal UDT handling

Memory allocation improvements: 20-30% reduction in allocation overhead for network operations

Batch operations: 3-10x faster than individual operations

Code quality: Enhanced with idiomatic Rust patterns and clippy optimizations

Network efficiency: Optimized packet building with pre-allocated buffers

Library Health: All 31 unit tests passing, production-ready core

Operation	Throughput	Latency	Memory Usage
Single Tag Read	3,000+ ops/sec	<1ms	~800B
Single Tag Write	1,500+ ops/sec	<2ms	~800B
Batch Operations	2,000+ ops/sec	5-20ms	~2KB
Real-time Subscriptions	1,000+ tags/sec	1-10ms	~1KB
Tag Path Parsing	10,000+ ops/sec	<0.1ms	~1KB
Connection Setup	N/A	50-200ms	~4KB
Memory per Connection	N/A	N/A	~4KB base

📋 Development Roadmap

🔥 Phase 1: Core Enhancements ✅ COMPLETED - January 2026

Basic tag read/write operations
Connection management and session handling
Enhanced tag path parsing (Program-scoped, arrays, bit access)
Complete data type support (All Allen-Bradley types)
C# wrapper integration (22 FFI functions)
Comprehensive testing (30+ unit tests)
Build automation (Cross-platform build scripts)
Documentation (Examples, API docs, guides)

⚡ Phase 2: Advanced Features ✅ COMPLETED - January 2026

Batch operations (multi-tag read/write) ✅ COMPLETED
Real-time subscriptions (tag change notifications) ✅ COMPLETED
Performance optimizations (20% faster operations + memory improvements) ✅ COMPLETED
Enhanced error handling & recovery ✅ COMPLETED

🎯 Phase 3: Production Ready ✅ COMPLETED - January 2026

Production monitoring - Comprehensive metrics and health checks
Configuration management - Production-ready config system
Error handling - Detailed CIP error mapping and recovery
Performance optimization - Batch operations and connection pooling
Generic UDT Format - Universal UDT handling with UdtData struct (v0.6.0)
Library Testing - All 31 unit tests passing
Code Quality - Comprehensive examples and tests updated for new API
Community features - Discord server, GitHub discussions, sponsorship program

🚀 Phase 4: Industrial Routing Support ✅ PARTIALLY IMPLEMENTED

Basic slot configuration - Support for CPUs in slots 0-31 (✅ Implemented in v0.6.0)
Simple backplane routing - Direct backplane communication (✅ Implemented in v0.6.0)
Route path building - CIP route path construction (✅ Implemented in v0.6.0)
Network routing - Multi-hop network routing via addresses and ports (✅ Implemented in v0.6.0)
Path validation - Route path verification and CIP byte construction (✅ Implemented in v0.6.0)
Remote rack support - Connect to remote racks via network (⚠️ Basic support exists, needs testing)
Advanced routing - Complex network topologies (⚠️ Basic support exists, needs validation)
Route discovery - Automatic path detection (❌ Not implemented)

Note: ControlLogix systems with CPUs in different slots can be tested using the RoutePath API. Use EipClient::with_route_path() or set_route_path() with RoutePath::new().add_slot(slot_number) to connect to ControlLogix CPUs in slots 0-31.

🛠️ Installation

📦 Rust Library (Crates.io)

The easiest way to get started is by adding the crate to your Cargo.toml:

[dependencies]

rust-ethernet-ip = "0.5.3"

tokio = { version = "1.0", features = ["full"] }



### Rust Library

Add to your `Cargo.toml`:



```toml

[dependencies]

rust-ethernet-ip = "0.6.0"

tokio = { version = "1.0", features = ["full"] }

C# Wrapper

Install via NuGet:

<PackageReference Include="RustEtherNetIp" Version="0.6.0" />

Or via Package Manager Console:

Install-Package RustEtherNetIp

Python Wrapper

Install via pip:

pip install rust-ethernet-ip

Or build from source using maturin:

cd pywrapper

maturin develop

📖 Quick Start

UDT Discovery (v0.5.4)

use rust_ethernet_ip::{EipClient, RoutePath};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Connect to PLC
    let mut client = EipClient::connect("192.168.0.1:44818").await?;
    
    // Discover UDT structure automatically
    let definition = client.get_udt_definition("Part_Data").await?;
    println!("UDT: {}", definition.name);
    
    for member in &definition.members {
        println!("  {}: {} (offset: {}, size: {} bytes)", 
            member.name, 
            get_data_type_name(member.data_type),
            member.offset, 
            member.size
        );
    }
    
    // Read UDT data using discovered structure
    let udt_data = client.read_udt_chunked("Part_Data").await?;
    
    // Read individual members using discovered offsets
    for member in &definition.members {
        let value = client.read_udt_member_by_offset(
            "Part_Data",
            member.offset as usize,
            member.size as usize,
            member.data_type
        ).await?;
        
        println!("{}: {:?}", member.name, value);
    }
    
    Ok(())
}

Route Path Support (v0.5.4)

// Create route path for slot 2
let route = RoutePath::new()
    .add_slot(0)  // Backplane slot 0
    .add_slot(2); // Target slot 2

// Connect with route path
let mut client = EipClient::with_route_path("192.168.0.1:44818", route).await?;

// Read tags through the route
let value = client.read_tag("TestTag").await?;

Basic Usage

use rust_ethernet_ip::{EipClient, PlcValue};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Connect to CompactLogix PLC
    let mut client = EipClient::connect("192.168.1.100:44818").await?;
    
    // Read different data types
    let motor_running = client.read_tag("Program:Main.MotorRunning").await?;
    let production_count = client.read_tag("Program:Main.ProductionCount").await?;
    let temperature = client.read_tag("Program:Main.Temperature").await?;
    
    // Write values
    client.write_tag("Program:Main.SetPoint", PlcValue::Dint(1500)).await?;
    client.write_tag("Program:Main.StartButton", PlcValue::Bool(true)).await?;
    
    println!("Motor running: {:?}", motor_running);
    println!("Production count: {:?}", production_count);
    println!("Temperature: {:?}", temperature);
    
    Ok(())
}

C# Usage

using RustEtherNetIp;

using var client = new EtherNetIpClient();
if (client.Connect("192.168.1.100:44818"))
{
    // Read different data types
    bool motorRunning = client.ReadBool("Program:Main.MotorRunning");
    int productionCount = client.ReadDint("Program:Main.ProductionCount");
    float temperature = client.ReadReal("Program:Main.Temperature");
    
    // Write values
    client.WriteDint("Program:Main.SetPoint", 1500);
    client.WriteBool("Program:Main.StartButton", true);
    
    Console.WriteLine($"Motor running: {motorRunning}");
    Console.WriteLine($"Production count: {productionCount}");
    Console.WriteLine($"Temperature: {temperature:F1}°C");
}

Python Usage

from rust_ethernet_ip import PyEipClient

def main():
    # Create a client and connect to the PLC
    client = PyEipClient(addr="192.168.0.1")
    if not client.connect():
        print("Failed to connect to PLC")
        return

    try:
        # Read a DINT value
        value = client.read_dint("TestDINT")
        print("Read TestDINT:", value)
        
        # Write a new value
        client.write_dint("TestDINT", 42)
        print("Wrote 42 to TestDINT")
        
    except Exception as e:
        print("Error:", e)

if __name__ == "__main__":
    main()

Advanced Tag Addressing

// Program-scoped tags
let value = client.read_tag("Program:MainProgram.Tag1").await?;

// Array elements (v0.5.5 - automatic workaround)
let array_element = client.read_tag("Program:Main.MyArray[5]").await?;
// Writing array elements
client.write_tag("gArrayTest[0]", PlcValue::Dint(100)).await?;
// BOOL arrays work too
let bool_value = client.read_tag("gArrayBoolTest[5]").await?;
client.write_tag("gArrayBoolTest[5]", PlcValue::Bool(true)).await?;
let multi_dim = client.read_tag("Program:Main.Matrix[1,2,3]").await?;

// Bit access
let bit_value = client.read_tag("Program:Main.StatusWord.15").await?;

// UDT members
let udt_member = client.read_tag("Program:Main.MotorData.Speed").await?;
let nested_udt = client.read_tag("Program:Main.Recipe.Step1.Temperature").await?;

// String operations
let string_length = client.read_tag("Program:Main.ProductName.LEN").await?;
let string_char = client.read_tag("Program:Main.ProductName.DATA[0]").await?;

Complete Data Type Examples

// All supported data types
let bool_val = client.read_tag("BoolTag").await?;           // BOOL
let sint_val = client.read_tag("SintTag").await?;           // SINT (-128 to 127)
let int_val = client.read_tag("IntTag").await?;             // INT (-32,768 to 32,767)
let dint_val = client.read_tag("DintTag").await?;           // DINT (-2.1B to 2.1B)
let lint_val = client.read_tag("LintTag").await?;           // LINT (64-bit signed)
let usint_val = client.read_tag("UsintTag").await?;         // USINT (0 to 255)
let uint_val = client.read_tag("UintTag").await?;           // UINT (0 to 65,535)
let udint_val = client.read_tag("UdintTag").await?;         // UDINT (0 to 4.3B)
let ulint_val = client.read_tag("UlintTag").await?;         // ULINT (64-bit unsigned)
let real_val = client.read_tag("RealTag").await?;           // REAL (32-bit float)
let lreal_val = client.read_tag("LrealTag").await?;         // LREAL (64-bit double)
let string_val = client.read_tag("StringTag").await?;       // STRING
let udt_val = client.read_tag("UdtTag").await?;             // UDT

⚡ Batch Operations ✅ COMPLETED

Dramatically improve performance with batch operations that execute multiple read/write operations in a single network packet. Perfect for data acquisition, recipe management, and coordinated control scenarios.

🚀 Performance Benefits

3-10x faster than individual operations
Reduced network traffic (1-5 packets instead of N packets for N operations)
Lower PLC CPU usage due to fewer connection handling overheads
Better throughput for data collection and control applications

📊 Use Cases

Data acquisition: Reading multiple sensor values simultaneously
Recipe management: Writing multiple setpoints at once
Status monitoring: Reading multiple status flags efficiently
Coordinated control: Atomic operations across multiple tags

🔧 Basic Batch Reading

use rust_ethernet_ip::{EipClient, BatchOperation, PlcValue};

// Read multiple tags in a single operation
let tags_to_read = vec![
    "ProductionCount",
    "Temperature_1", 
    "Temperature_2",
    "Pressure_1",
    "FlowRate",
];

let results = client.read_tags_batch(&tags_to_read).await?;
for (tag_name, result) in results {
    match result {
        Ok(value) => println!("📊 {}: {:?}", tag_name, value),
        Err(error) => println!("❌ {}: {}", tag_name, error),
    }
}

✏️ Basic Batch Writing

// Write multiple tags in a single operation
let tags_to_write = vec![
    ("SetPoint_1", PlcValue::Real(75.5)),
    ("SetPoint_2", PlcValue::Real(80.0)),
    ("EnableFlag", PlcValue::Bool(true)),
    ("ProductionMode", PlcValue::Dint(2)),
    ("RecipeNumber", PlcValue::Dint(42)),
];

let results = client.write_tags_batch(&tags_to_write).await?;
for (tag_name, result) in results {
    match result {
        Ok(()) => println!("✅ {}: Write successful", tag_name),
        Err(error) => println!("❌ {}: {}", tag_name, error),
    }
}

🔄 Mixed Operations (Reads + Writes)

use rust_ethernet_ip::BatchOperation;

let operations = vec![
    // Read current values
    BatchOperation::Read { tag_name: "CurrentTemp".to_string() },
    BatchOperation::Read { tag_name: "CurrentPressure".to_string() },
    
    // Write new setpoints
    BatchOperation::Write { 
        tag_name: "TempSetpoint".to_string(), 
        value: PlcValue::Real(78.5) 
    },
    BatchOperation::Write { 
        tag_name: "PressureSetpoint".to_string(), 
        value: PlcValue::Real(15.2) 
    },
    
    // Update control flags
    BatchOperation::Write { 
        tag_name: "AutoModeEnabled".to_string(), 
        value: PlcValue::Bool(true) 
    },
];

let results = client.execute_batch(&operations).await?;
for result in results {
    match result.operation {
        BatchOperation::Read { tag_name } => {
            match result.result {
                Ok(Some(value)) => println!("📊 Read {}: {:?} ({}μs)", 
                    tag_name, value, result.execution_time_us),
                Err(error) => println!("❌ Read {}: {}", tag_name, error),
            }
        }
        BatchOperation::Write { tag_name, .. } => {
            match result.result {
                Ok(_) => println!("✅ Write {}: Success ({}μs)", 
                    tag_name, result.execution_time_us),
                Err(error) => println!("❌ Write {}: {}", tag_name, error),
            }
        }
    }
}

⚙️ Advanced Configuration

use rust_ethernet_ip::BatchConfig;

// High-performance configuration
let high_perf_config = BatchConfig {
    max_operations_per_packet: 50,      // More operations per packet
    max_packet_size: 4000,              // Larger packets for modern PLCs
    packet_timeout_ms: 1000,            // Faster timeout
    continue_on_error: true,            // Don't stop on single failures
    optimize_packet_packing: true,      // Optimize packet efficiency
};

client.configure_batch_operations(high_perf_config);

// Conservative/reliable configuration
let conservative_config = BatchConfig {
    max_operations_per_packet: 10,      // Fewer operations per packet
    max_packet_size: 504,               // Smaller packets for compatibility
    packet_timeout_ms: 5000,            // Longer timeout
    continue_on_error: false,           // Stop on first error
    optimize_packet_packing: false,     // Preserve exact operation order
};

client.configure_batch_operations(conservative_config);

📈 Performance Comparison Example

use std::time::Instant;

let tags = vec!["Tag1", "Tag2", "Tag3", "Tag4", "Tag5"];

// Individual operations (traditional approach)
let individual_start = Instant::now();
for tag in &tags {
    let _ = client.read_tag(tag).await?;
}
let individual_duration = individual_start.elapsed();

// Batch operations (optimized approach)  
let batch_start = Instant::now();
let _ = client.read_tags_batch(&tags).await?;
let batch_duration = batch_start.elapsed();

let speedup = individual_duration.as_nanos() as f64 / batch_duration.as_nanos() as f64;
println!("📈 Performance improvement: {:.1}x faster with batch operations!", speedup);

🚨 Error Handling

// Batch operations provide detailed error information per operation
match client.execute_batch(&operations).await {
    Ok(results) => {
        let mut success_count = 0;
        let mut error_count = 0;
        
        for result in results {
            match result.result {
                Ok(_) => success_count += 1,
                Err(_) => error_count += 1,
            }
        }
        
        println!("📊 Results: {} successful, {} failed", success_count, error_count);
        println!("📈 Success rate: {:.1}%", 
            (success_count as f32 / (success_count + error_count) as f32) * 100.0);
    }
    Err(e) => println!("❌ Entire batch failed: {}", e),
}

🎯 Best Practices

Use batch operations for 3+ operations to see significant performance benefits
Group similar operations (reads together, writes together) for optimal packet packing
Adjust max_operations_per_packet based on your PLC's capabilities (10-50 typical)
Use higher packet sizes (up to 4000 bytes) for modern CompactLogix/ControlLogix PLCs
Enable continue_on_error for data collection scenarios where partial results are acceptable
Disable optimize_packet_packing if precise operation order is critical for your application

🏗️ Building

Quick Build

# Windows

build.bat


# Linux/macOS

./build.sh

Manual Build

# Build Rust library

cargo build --release --lib


# Copy to C# project (Windows)

copy target\release\rust_ethernet_ip.dll csharp\RustEtherNetIp\


# Build C# wrapper

cd csharp/RustEtherNetIp

dotnet build --configuration Release

See BUILD.md for comprehensive build instructions.

🧪 Testing

Run the comprehensive test suite:

# Rust unit tests (30+ tests)

cargo test


# C# wrapper tests

cd csharp/RustEtherNetIp.Tests

dotnet test


# Run examples

cargo run --example advanced_tag_addressing

cargo run --example data_types_showcase

🎯 Examples

Explore comprehensive examples demonstrating all library capabilities across different platforms:

🌐 TypeScript + React Dashboard (Recommended)

Modern web-based PLC dashboard with real-time monitoring and advanced features.

# Start backend API

cd examples/AspNetExample

dotnet run


# Start frontend (new terminal)

cd examples/TypeScriptExample/frontend

npm install && npm run dev

Features:

✅ Modern UI/UX with glassmorphism design and responsive layout
✅ Real-time monitoring with live tag updates and performance metrics
✅ Complete data type support for all 13 Allen-Bradley types
✅ Advanced tag addressing with interactive examples
✅ Type-safe API with comprehensive TypeScript interfaces
✅ Professional features including benchmarking and activity logging

Perfect for: Web applications, dashboards, remote monitoring, modern industrial HMIs

🖥️ WPF Desktop Application

Rich desktop application with MVVM architecture and modern UI.

cd examples/WpfExample

dotnet run

Features:

✅ MVVM architecture with CommunityToolkit.Mvvm
✅ Real-time tag monitoring with automatic refresh
✅ Advanced tag discovery with type detection
✅ Performance benchmarking with visual metrics
✅ Comprehensive logging with timestamped activity

Perfect for: Desktop HMIs, engineering tools, maintenance applications

🪟 WinForms Application

Traditional Windows Forms application with familiar UI patterns.

cd examples/WinFormsExample

dotnet run

Features:

✅ Classic Windows UI with familiar controls
✅ Connection monitoring with automatic reconnection
✅ Tag operations with validation and error handling
✅ Performance testing with real-time metrics
✅ Industrial styling with professional appearance

Perfect for: Legacy system integration, simple HMIs, maintenance tools

🌐 ASP.NET Core Web API

RESTful API backend providing HTTP access to PLC functionality.

cd examples/AspNetExample

dotnet run

Features:

✅ RESTful endpoints for all PLC operations
✅ Swagger documentation with interactive API explorer
✅ Type-safe operations with comprehensive validation
✅ Performance monitoring with built-in benchmarking
✅ Production-ready with proper error handling and logging

Perfect for: Web services, microservices, system integration, mobile backends

🦀 Rust Examples

Native Rust examples demonstrating core library functionality.

# Advanced tag addressing showcase

cargo run --example advanced_tag_addressing


# Complete data types demonstration

cargo run --example data_types_showcase


# Batch operations performance demo

cargo run --example batch_operations_demo

Features:

✅ Advanced tag parsing with complex path examples
✅ All data types with encoding demonstrations
✅ Performance examples with async/await patterns
✅ Error handling with comprehensive error types
✅ Batch operations with performance comparisons and configuration examples

Perfect for: Rust applications, embedded systems, high-performance scenarios

🐹 Go + Next.js Fullstack Example (NEW in v0.4.0!)

Modern fullstack demo with a Go backend (using the Rust Go wrapper) and a Next.js (TypeScript) frontend for real-time, batch, and performance operations.

# Start backend

cd examples/gonextjs/backend

go run .


# Start frontend (new terminal)

cd ../frontend

npm install && npm run dev

Features:

✅ Go backend using the Rust EtherNet/IP Go wrapper (FFI)
✅ Next.js frontend (TypeScript, Tailwind, App Router)
✅ Batch read/write and individual tag operations
✅ Performance benchmarking (ops/sec, latency)
✅ Real-time tag updates via WebSocket
✅ Comprehensive PLC data type support
✅ Modern, responsive UI
✅ 🏭 Professional HMI/SCADA Demo - Production-ready dashboard with OEE analysis, process monitoring, and industrial data visualization

Perfect for: Modern web dashboards, Go/TypeScript fullstack apps, real-time industrial monitoring, HMI/SCADA systems

⚡ Vue.js 3 + TypeScript Frontend (NEW in v0.4.0!)

Modern Vue.js 3 frontend with TypeScript, Tailwind CSS, and Pinia state management, designed to integrate with ASP.NET Core backends.

# Start backend API

cd examples/AspNetExample

dotnet run


# Start Vue.js frontend (new terminal)

cd examples/VueExample

npm install && npm run dev

Features:

✅ Vue.js 3 with Composition API and TypeScript
✅ Tailwind CSS for modern, responsive design
✅ Pinia state management for application state
✅ Backend detection system for automatic ASP.NET Core port discovery
✅ Component-based architecture with reusable UI components
✅ Real-time connection monitoring with PLC status display
✅ Tag operations interface for read/write operations
✅ Professional dashboard with metrics and activity logging
✅ Development tools including BackendDetector for debugging

Perfect for: Modern web applications, Vue.js-based HMIs, industrial dashboards, ASP.NET Core integration

🚀 Quick Start Guide

Choose your platform:
- Web/Modern UI → TypeScript + React Dashboard or Vue.js 3 + TypeScript
- Desktop/Windows → WPF or WinForms Application
- Web API/Services → ASP.NET Core Web API
- Native/Performance → Rust Examples
Start the backend (for web examples):
```
cd examples/AspNetExample

dotnet run
```
Run your chosen example and connect to your PLC at 192.168.0.1:44818
Explore features:
- Tag discovery with advanced addressing
- Real-time monitoring and benchmarking
- All 13 Allen-Bradley data types
- Professional error handling and logging

📁 Example Structure

examples/
├── TypeScriptExample/          # React + TypeScript dashboard
│   ├── frontend/              # Modern web UI
│   ├── start-backend.bat      # Backend startup script
│   └── start-frontend.bat     # Frontend startup script
├── VueExample/                 # Vue.js 3 + TypeScript frontend
│   ├── src/                   # Vue.js source code
│   ├── start-frontend.bat     # Frontend startup script
│   └── README.md              # Comprehensive documentation
├── WpfExample/                # WPF desktop application
├── WinFormsExample/           # WinForms desktop application
├── AspNetExample/             # ASP.NET Core Web API
├── gonextjs/                  # Go + Next.js fullstack example
└── rust-examples/             # Native Rust examples
    ├── advanced_tag_addressing.rs
    ├── data_types_showcase.rs
    └── batch_operations_demo.rs

Each example includes comprehensive documentation, setup instructions, and demonstrates different aspects of the library's capabilities.

📚 Documentation

API Documentation - Complete API reference
Examples - Practical usage examples
Build Guide - Comprehensive build instructions
C# Wrapper Guide - C# integration documentation
Changelog - Version history and changes
Crates.io Page - Official crate registry page

💖 Sponsor This Project

This project is developed for the industrial automation community. If you find this library valuable for your projects, please consider sponsoring its development!

🎯 Why Sponsor?

🚀 Accelerate Development - Help fund new features, performance improvements, and platform support
🐛 Priority Bug Fixes - Get faster resolution of issues affecting your production systems
💡 Feature Requests - Influence the roadmap with your specific industrial automation needs
📚 Enhanced Documentation - Support creation of comprehensive guides and tutorials
🔧 Professional Support - Access to direct developer support for complex implementations

💰 Sponsorship Tiers

☕ Coffee - Show appreciation for the project
🚀 Feature Sponsor - Fund specific feature development
🏭 Enterprise Sponsor - Priority support and custom development
🌟 Platinum Sponsor - Direct collaboration and roadmap input

🎁 Sponsor Benefits

Priority issue resolution for production-critical bugs
Direct access to development team for technical questions
Early access to new features and beta releases
Custom feature development for your specific use cases
Recognition in project documentation and releases

Sponsor on GitHub →

💬 Feedback & Feature Requests

We value your input! Help us improve the library by sharing:

🐛 Bug Reports

Production Issues - Critical bugs affecting your systems
Performance Problems - Slow operations or memory issues
Compatibility Issues - Problems with specific PLC models or configurations
Error Handling - Unexpected errors or unclear error messages

💡 Feature Requests

New Data Types - Additional Allen-Bradley data type support
Platform Support - New operating systems or architectures
Performance Features - Batch operations, caching, or optimization requests
Integration Features - New language bindings or framework integrations
Industrial Features - SCADA-specific functionality, alarms, or trending

📊 Use Case Sharing

Success Stories - How you're using the library in production
Performance Metrics - Real-world performance data from your applications
Integration Examples - Custom implementations or workarounds
Best Practices - Tips for other users in similar industries

Submit Feedback →

🤝 Community & Support

Discord Server - Community discussions, support, and development updates
GitHub Issues - Bug reports and feature requests
GitHub Discussions - General questions and ideas
Crates.io - Official Rust package registry

🙏 Inspiration

This project draws inspiration from excellent libraries in the industrial automation space:

pylogix - Python library for Allen-Bradley PLCs
pycomm3 - Python library for Allen-Bradley PLCs
gologix - Go library for Allen-Bradley PLCs
libplctag - Cross-platform PLC communication library

🚀 Contributing

We welcome contributions! Please see our Contributing Guide for details on:

Code style and standards
Testing requirements
Pull request process
Development setup

⚠️ Disclaimer and Liability

Use at Your Own Risk

This library is provided "AS IS" without warranty of any kind. Users assume full responsibility for its use in their applications and systems.

No Warranties

The developers and contributors make NO WARRANTIES, EXPRESS OR IMPLIED, including but not limited to:

Merchantability or fitness for a particular purpose
Reliability or availability of the software
Accuracy of data transmission or processing
Safety for use in critical or production systems

Industrial Safety Responsibility

🏭 Industrial Use: Users are solely responsible for ensuring this library meets their industrial safety requirements
🔒 Safety Systems: This library should NOT be used for safety-critical applications without proper validation
⚙️ Production Systems: Thoroughly test in non-production environments before deploying to production systems
📋 Compliance: Users must ensure compliance with all applicable industrial standards and regulations

Limitation of Liability

Under no circumstances shall the developers, contributors, or associated parties be liable for:

Equipment damage or malfunction
Production downtime or operational disruptions
Data loss or corruption
Personal injury or property damage
Financial losses of any kind
Consequential or indirect damages

User Responsibilities

By using this library, you acknowledge and agree that:

You have the technical expertise to properly implement and test the library
You will perform adequate testing before production deployment
You will implement appropriate safety measures and fail-safes
You understand the risks associated with industrial automation systems
You accept full responsibility for any consequences of using this library

Indemnification

Users agree to indemnify and hold harmless the developers and contributors from any claims, damages, or liabilities arising from the use of this library.

⚠️ IMPORTANT: This disclaimer is an integral part of the license terms. Use of this library constitutes acceptance of these terms.

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

Built for the industrial automation community

📦 Examples

C# + React: Modern web and desktop examples using the C# wrapper
Go + Next.js: Fullstack Go backend + Next.js frontend example (NEW in v0.4.0!)
Vue.js 3 + TypeScript: Modern Vue.js frontend with ASP.NET Core integration (NEW in v0.4.0!)
TypeScript + ASP.NET: Classic React + ASP.NET example
...and more in the examples/ directory

🏗️ Build All

To build all wrappers, libraries, and examples (including Go + Next.js and Vue.js):

./build-all.bat

This script builds:

Rust library (DLL/SO/DYLIB)
C# wrapper and tests
Go wrapper and tests
All example backends and frontends (C#, Go, TypeScript, Next.js, Vue.js)

See BUILD.md for details.

🆕 Version

Current Release: v0.6.0 (CHANGELOG.md)

📝 Changelog

v0.6.0 (January 2026) - CURRENT 🎉

🔧 Generic UDT Format: New UdtData struct with symbol_id and raw bytes
✅ Library Health: All 31 unit tests passing, production-ready core
📊 Array Element Access: Full read/write support for array elements
✍️ Array Element Writing: Write individual array elements with automatic array modification
🚀 C# Wrapper Enhancements: Batch operations, TagGroup, Statistics, Data Quality & Timestamp
🔧 Connection Fixes: Fixed RoutePath handling in WinForms, WPF, and ASP.NET applications
📚 Documentation: Comprehensive documentation for STRING and UDT array write limitations

v0.5.5 (December 2025)

📊 Array Element Access: Full read/write support for array elements using intelligent workaround
✍️ Array Element Writing: Write individual array elements with automatic array modification
🔧 BOOL Array Support: Automatic DWORD bit extraction for BOOL arrays

v0.5.4 (October 2025)

🔍 UDT Definition Discovery: Automatic UDT structure detection from PLC
🏷️ Enhanced Tag Discovery: Full attribute support with permissions and scope
📦 Packet Size Negotiation: Dynamic optimization for firmware 20+
🛣️ Route Path Support: Slot configuration and multi-hop routing
💾 Cache Management: Smart caching for UDT definitions and tag attributes
🔧 CIP Services: Full implementation of Services 0x03 and 0x4C
🧪 Comprehensive Testing: 14 new unit tests for UDT discovery features
📚 Documentation: Complete API documentation and examples

See CHANGELOG.md for a full list of changes.

🚀 Release Notes

See RELEASE_NOTES_v0.5.0.md for detailed release notes and migration info.

🚀 Quick Start: Go + Next.js Fullstack Example

See examples/gonextjs/README.md for step-by-step instructions.
Features: Go backend (using Rust FFI), Next.js frontend, batch ops, real-time, performance, and more.

rust-ethernet-ip 0.6.0

🦀 Rust EtherNet/IP Driver

🎯 Current Development Focus

🎯 Project Focus

✅ v0.6.0 New Features

✅ v0.5.4 Features

✨ Key Features

🔍 UDT Discovery & Management (v0.5.4)

🛣️ Route Path Support (v0.5.4, Enhanced in v0.6.0)

📦 Packet Size Optimization (v0.5.4)

🧠 Enhanced UDT Processing ✅ NEW in v0.5.4

🔧 Connection Robustness

⚠️ Known Limitations

STRING Tag Writing

UDT Array Element Member Writing

Summary of Limitations

📍 Advanced Tag Addressing ✅ COMPLETED

📊 Complete Data Type Support ✅ COMPLETED

🔗 Language Bindings

C# Integration 🎯 CURRENT FOCUS - Active Development

Go Integration ⏸️ ON HOLD

Python Integration ⏸️ ON HOLD

⚠️ Comprehensive Error Handling ✅ COMPLETED

🏗️ Build System ✅ COMPLETED

⚡ Real-Time Subscriptions ✅ NEW in v0.4.0

🚀 High-Performance Batch Operations ✅ NEW in v0.4.0

🏭 HMI/SCADA Production Demo

🎯 Demo Features

🚀 Perfect for Demonstrations

🏷️ Required PLC Tags

🚀 Performance Characteristics

📋 Development Roadmap

🔥 Phase 1: Core Enhancements ✅ COMPLETED - January 2026

⚡ Phase 2: Advanced Features ✅ COMPLETED - January 2026

🎯 Phase 3: Production Ready ✅ COMPLETED - January 2026

🚀 Phase 4: Industrial Routing Support ✅ PARTIALLY IMPLEMENTED

🛠️ Installation

📦 Rust Library (Crates.io)

C# Wrapper

Python Wrapper

📖 Quick Start

UDT Discovery (v0.5.4)

Route Path Support (v0.5.4)

Basic Usage

C# Usage

Python Usage

Advanced Tag Addressing

Complete Data Type Examples

⚡ Batch Operations ✅ COMPLETED

🚀 Performance Benefits

📊 Use Cases

🔧 Basic Batch Reading

✏️ Basic Batch Writing

🔄 Mixed Operations (Reads + Writes)

⚙️ Advanced Configuration

📈 Performance Comparison Example

🚨 Error Handling

🎯 Best Practices

🏗️ Building

Quick Build

Manual Build

🧪 Testing

🎯 Examples

🌐 TypeScript + React Dashboard (Recommended)

🖥️ WPF Desktop Application

🪟 WinForms Application

🌐 ASP.NET Core Web API

🦀 Rust Examples

🐹 Go + Next.js Fullstack Example (NEW in v0.4.0!)

⚡ Vue.js 3 + TypeScript Frontend (NEW in v0.4.0!)

🚀 Quick Start Guide

📁 Example Structure

📚 Documentation

💖 Sponsor This Project

🎯 Why Sponsor?

💰 Sponsorship Tiers

🎁 Sponsor Benefits

💬 Feedback & Feature Requests

🐛 Bug Reports

💡 Feature Requests