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Downloading to PMAC with project running causes watchdog fault


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We are using a PowerPMAC dual core 465 CPU (firmware version


When a project is loaded and running, a new download (via IDE to the PMAC will often cause it to watchdog. This is very inconvenient, because it causes us to re-enable / re-home all of our machine motors.


Once we power cycle the PMAC, the build and download succeeds.


Is there something we can do to prevent watch dogging the PMAC on downloads?

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Is this a hardware watchdog? Does PMAC have a red light? Did you see it in the Global Status window?


If this is a soft watchdog, you should be able to prevent it by setting Sys.WDTReset and Sys.BgWDTReset to large values in pp_disable.txt. They should be set back to their default value of zero in pp_startup.txt. pp_disable is ran before the build and download to disable PMAC, pp_startup is ran once PMAC finishes the download.


It may also help to use pp_disable.txt to disable PLC other processes that you believe may be an issue.


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