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For our steam turbine control we are using S7-300 PLC with WinCC SCADA. Since a few days we face a very strange problem in this system. We found some motors are not operating from the SCADA graphic page. Later we found out that these same motors are operating when we changeover the PLC CPU. We have redundancy for CPU 315-2DP and for the interface modules. By changeover I mean is that when we switch over to CPU no. 2 from no. 1.
We have checked thoroughly the program residing in both the CPUs and found exactly identical. The netwoking with the SCADA is by MPI port and networking of peripherals is by PROFIBUS.
Can anybody out there give some hints for trouble shooting this problem? Thanks.
We have checked thoroughly the program residing in both the CPUs and found exactly identical. The netwoking with the SCADA is by MPI port and networking of peripherals is by PROFIBUS.
Can anybody out there give some hints for trouble shooting this problem? Thanks.