PaulZ Posted February 8, 2019 Report Share Posted February 8, 2019 I am trying to find a way to detect that the PLC OS (application) is not running anymore. If I program micro controllers I just use a watchdog timer system, either internally or externally. But I have no idea how to do this in the PLC world. So my questions are: - What happens to the outputs of the PLC in case the PLC "stops" for whatever reason? Do they remain in the same state as just before the crash, or will they all go to inactive? - What is the normal / standard way to detect this in the PLC world? 🙂 - Does a watchdog reset happen, resetting the PLC, or does that require additional circuitry? Of course power failure is easy to detect by using one output which is always active when running... There is also a chance that I am worrying too much about it all, and it is "not really" needed... Thanks in advance for your time...! Paul Quote Link to comment Share on other sites More sharing options...
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