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Our manager wants a new PLC system for 40+ PID loops. In addition to the PLC, they are requesting backup stand alone loop controllers for all 40+ loops. The concern is if the PLC fails, there is no way to run the plant.
I have questions on the following topics:
1) Wiring of the analog outputs (analog inputs should be OK)
2) Preventing windup of the backup controller
3) Switching between the PLC and single loop controller
4) How to deal with Cascaded Loops
5) Any other thoughts you guys may have to consider?
I have questions on the following topics:
1) Wiring of the analog outputs (analog inputs should be OK)
2) Preventing windup of the backup controller
3) Switching between the PLC and single loop controller
4) How to deal with Cascaded Loops
5) Any other thoughts you guys may have to consider?