Struct profirust :: fdl :: ParametersBuilder Copy item path

impl ParametersBuilder

pub fn new(address: u8, baudrate: Baudrate) -> Self

Start building parameters for an FDL master with the given address.

address must be a valid PROFIBUS address (<= 125).
baudrate is the baudrate the is used for this PROFIBUS network.

pub fn slot_bits(&mut self, slot_bits: u16) -> &mut Self

Configure non-standard T_SL (slot time in bits)

The slot time must be larger than the maximum T_SDR of all peripherals. build_verified() will check that this is the case.

The slot time must be creater than the default slot time:

Baudrate	Minimum Slot Time (in Bits)
<=187500	100
500000	200
1500000	300
3000000	400
6000000	600
12000000	1000

pub fn highest_station_address(&mut self, hsa: u8) -> &mut Self

Set the highest projected station address.

The HSA is used when scanning for other FDL masters who want to participate on the bus.

The HSA also affects what addresses will appear in the live list recorded by this master.

By default, all addresses are scanned (HSA = 126). This means all masters will be found but it also means that the time until a master can join the token ring is rather long. It is advisable to choose low addresses for all masters and then set the HSA accordingly to optimize recovery time after a master drops from the bus.

pub fn token_rotation_bits(&mut self, ttr: u32) -> &mut Self

Set the projected token rotation time (in bits).

The TTR is used to ensure each FDL master gets a chance to communicate with its peripherals in deterministic time.

It is important that the TTR is not too small as this unnecessarily slows down communication. Defaults to 32436.

pub fn gap_wait_rotations(&mut self, gap_wait: u8) -> &mut Self

Set how many token rotations to wait before restarting the GAP scan.

The GAP scan is used to detect other FDL masters who want to communicate on the bus.

This factor is the wait time between scan cycles. A low value means stations are found very quickly but the tradeoff is a higher average cycle time.

pub fn max_retry_limit(&mut self, max_retry_limit: u8) -> &mut Self

Set the maximum number of retries when communication with a peripheral fails.

After this amount of retries, the peripheral is considered offline and will need to be reconfigured once it appears again.

On a bus that is electrically sound, no retries should ever be necessary. When you have to increase the retry count to keep your bus working, it is recommended to check for electrical and/or noise problems.

Default value is 1, meaning a telegram is retried once when no response was received.

pub fn min_tsdr(&mut self, min_tsdr_bits: u8) -> &mut Self

Set the minimum response time that peripherals should adhere to.

This value can be increased when peripherals responding after 11 bits is too fast for the bus to settle.

pub fn watchdog_timeout(&mut self, wdg: Duration) -> &mut Self

Set the watchdog timeout that peripherals should use to fail-safe after loosing communication.

pub fn build(&self) -> Parameters

Build the parameters struct.

pub fn build_verified(&self, dp_master: &DpMaster<'_>) -> Parameters

Build the parameters struct and verify it against the given DP master.

This ensures that, for example, the selected T_SL is greater than the max Tsdr of all peripherals currently tracked by the DP master.

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impl UnwindSafe for ParametersBuilder

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