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Want to know the process parameters and other IO status in S7-400R Redunant PLC System when there is changeover of CPU due to failure of one of the CPU of communication sub system
We have been proposed with a configuration of Siemens S7-400R PLC with Redundant CPUs, Redundant I/O Bus (Profibus DP) and Redundant IM modules. I want to know in case of any CPU or IM module failure, what will be the status of the following:
a) Closed loop control status including SV and MV
b) Start / Stop and valve On/off commands
c) Any forced Digital inputs or outputs
Whether the CPU changeover will be seamless without affecting the process or plant to trip ?
We have been proposed with a configuration of Siemens S7-400R PLC with Redundant CPUs, Redundant I/O Bus (Profibus DP) and Redundant IM modules. I want to know in case of any CPU or IM module failure, what will be the status of the following:
a) Closed loop control status including SV and MV
b) Start / Stop and valve On/off commands
c) Any forced Digital inputs or outputs
Whether the CPU changeover will be seamless without affecting the process or plant to trip ?
