Three Siemens PLCs are all reporting BF and SF errors at the same time, what’s going on?
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Three sets of coal mills, three PLC cabinets – do the SF and BF lights come on simultaneously in all three PLC cabinets?
BF Bus Fault: Bus failure – the SF System Fault indicator lights up in this case; System Fault: Hardware or software failure of the module – the indicator lights up in this situation
What is the relationship between the 3 PLCs? Under what operating conditions was the fault reported?
The three PLCs are independent; there are three sets of coal mills, which is why there are three PLCs. They serve as backups for one another, so it’s no problem. All three sets of mills are currently shut down, and it is a fault that has been reported.