Startup/fault settings dialog

SetPrm unlock before DP start-up
Normally, during DP start-up, the DP master removes the cyclic connections, so that the DP slave can always recognize that the DP master has restarted. In redundancy mode, however, it may be specifically desirable for the DP slave to remain unaware of this, because the switch-over from the primary master to the redundant master should not have any interactions for the DP slave (see the Master Redundancy section).

SetPrm unlock at DP shutdown
Normally, during DP shut-down, the DP master removes the cyclic connections, so that the DP slave can always recognize that the DP master has stopped. In redundancy mode, however, it may be specifically desirable for the DP slave to remain unaware of this, because the switch-over from the primary master to the redundant master should not have any interactions for the DP slave (see the Master Redundancy section).

Operate delay
The DP master changes automatically, observing the Auto-Clear-Mode, into the operate state when the task is started. The transition from Clear to Operate can be delayed or with the Operate delay time. In the Clear state, all the outputs are set to 0 (if the DP slave does not support Fail_Safe values) or to the Fail_Safe value (if the DP slave supports Fail_Safe), whereas in the Operate state the outputs have the values specified by the task.

Response to task STOP
It is possible to specify here whether the DP master should set the outputs to 0 when reaching a PLC stop or breakpoint, or should leave them unchanged (see the Fault Reactions section).

Task watchdog (EtherCAT watchdog)
The DP master changes automatically into the clear mode (the outputs of the slaves are set either to 0 or to the fail-safe value) when it ceases to receive an interrupt from the associated task (e.g. a PLC breakpoint has been reached, or the system has crashed). It is possible to specify here how many missing tasks cycles can be tolerated before the master switches into the clear mode. This setting is independent of the setting in the Clear mode.

Clear mode
Here you can specify that the master should switch to or remain in "Clear" state, as long as at least one MC slave (setting: "if an MC slave fails") or any slave (setting: "if a slave fails") does not respond correctly (i.e. DpState is not equal 0) (see section Error Reactions).

Windows watchdog (only FC310x)
Not relevant for EL6731.

Set WD individually for each slave
Here you can select whether the WD should be set individually for each slave (on the Profibus tab of the box).

DP watchdog time
If the checkbox "Set WD individually for each slave" is not ticked, the DP watchdog can be set here to a uniform value for all slaves.

Calculate DP slave watchdog time
This is used to set the DP watchdog time for all DP slaves to a suitable value.