slave not exist
We have a ABB DCS control system. it's consist of tow AC800F works redundantly .but suddenly we lose all system in a second and many fault appears in a log file consist of:
SL_2F1_3 slave not exist
SL_2F1_4 slave not exist
SL_2F1_5 slave not exist
but after second it will be fix and after about 14 days it comes again.pls help me
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