Vishakha

 

zako_

Maybe you should open a Service Request to be in contact with the drive experts directly. For example we don´t know if you have a SIMATIC PLC or a 3rd party system.

 Yes u r right that PLC is third party PLC (Allen Braley).

Also after changing the control unit to a newer one, same problem persists so even i feel that  PLC side there is a problem. But what can be the issue , i mean configuration is correct + telegram , still 8501 fault is coming.

Hi, we experience the same problems having Allen Bradley redundant PLCs with ca 25 G120X drives on Ethernet IP ring. Sometime in the middle of production the drives shut down due to fault 8501 and sometimes fault 8502. the fault usually can be reset from the drive panel. and put back to work. But it's still very dangerous as the pumps shut down spontaneously. We increase communication cycle time already from 50ms to 200ms, but still the same error sometimes on a few drives.  This can happen after hours of production. 

Does anyone have any solution idea for it?

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Split from FAULT 8501 CU240E-2 PN .