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We are using the latest in Siemens technology which are PCS7 for the hardware and WinCC for the HMI. There are two redundant CPUs for each
plant and we all know that when the primary (Master) fails, the second CPU will take over. At first, the process seem alright. Until
recently, when the master CPU experienced a fault, naturally it will go into STOP mode. But the second CPU did not take over. This is very
alarming for a redundant system to shutdown at the same time. We tried to figure out all the diagnostics, check the time of scanning but all
seem okay. Is there any apparent reason for this simultaneous shutdown of CPU? Thanks in advance..
plant and we all know that when the primary (Master) fails, the second CPU will take over. At first, the process seem alright. Until
recently, when the master CPU experienced a fault, naturally it will go into STOP mode. But the second CPU did not take over. This is very
alarming for a redundant system to shutdown at the same time. We tried to figure out all the diagnostics, check the time of scanning but all
seem okay. Is there any apparent reason for this simultaneous shutdown of CPU? Thanks in advance..