The 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.

Reaction on 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: 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: It is possible to specify here whether the master enters (or stays in) the "Clear" state as long as either at least one MC slave (the "Only MC-Slaves" setting) or any slave (the "All Slaves" setting) does not respond correctly (has a DpState other than 0) (see the Error Reactions section).

Windows-Watchdog: Here a watchdog can be activated, which, in case of a PC crash, will cause the FC310x to enter the STOP state and terminate the data exchange with all configured slaves (see Error Reactions). The time is important in Redundancy Mode of the primary master.

Set WD individually for each Slave: It can be selected here, if the DP-Watchdog should be set for each slave individually (on the tab PROFIBUS of the box)

DP-Watchdog-Time: If the Check-Box "Set WD individually for each Slave" is not selected, a unique DP-Watchdog for all slaves can be set here.

Calculate DP-Slave Watchdog Time: This will set the DP watchdog time for all the DP slaves to a reasonable value.