Safety Watchdog Time Zero (V2 CPU)

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The safety watchdog time value (F_WD_Time) is 0 ms in an AC500 V2 non-safety CPU PM5xx system. This indicates an invalid or unconfigured watchdog timer, critical for maintaining safe PROFIsafe communication.

• Safety watchdog timer in the V2 CPU has expired.
• Application program is not executing within the expected time frame.
• Program logic is too slow or has a deadlock.
• Incorrect F_WD_Time parameter value.

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1. 1

   Check the safety PLC configuration for the "F_WD_Time" parameter.