AC450 RMC WITH 4 NOS PM511V116 CPU with OB fault repeated randomly

ac450 RMC rack for rolling mill application, we are getting "ob" fault randomly on individual controller.
we have taken halt code, attached
question is the system was working fine for last 10 years
now is this HW problem or sw problem ?

C--Users-insusat-Des.zip

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suresh Rank: 840

Asked 1 month ago

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For a standard AC450 (not a RMC version) 0B on the processor module PM511V16 means: " System program check sum test error. RAM test." with corrective action "Replace the processor module".

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