CI854 - Watchdog Time Monitoring
I'd like to know if it's possible monitor (in real time) Watchdog Time parameter from CI854.
Is there any interface that I can check/monitor its value? Can I create a logic in Control Builder M (for System 800xA 6.0.1) to monitor it?
Thanks for attention.
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That concept is used for example for two PLC communication or for communication with drives. I think is enough to check HW status of other profibus slaves whether communication is alive.
The help for CI854 module explains, that it has a fixed 1 sec watchdog timer - see below.
I don't think that you can monitor it (and there is no sense to do that for 1 sec period). It should be enough to read the unit status word for errors in the unit.
The other story is if you like to watch the activity in the slaves. In case you have DI and DO in it, you can do a simple logic. For example connect DO to DI, pulse DO and read DI.
System error handling.
The PROFIBUS DP-V1 master unit has a watchdog that expires if it is not triggered every second by the controller. Once the watchdog expires, the red Fault LED switches on. To get the master unit running again a reset of the controller has to be performed. When the watchdog expires, all connections are disconnected and the outputs on the connections are set to their defined SafeState if supported.
Source: CBM help for CI854