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What are some common causes for a Concept IEC Quantum Hot Standby configuration not going into Standby Mode?

  • CRP modules not present / linked together. The CRP modules must be in place and connected to each other with coax cable.
  • CHS modules not linked properly. Make sure that the fiber cable is good and the proper polarity is followed between CHS modules.
  • Program mismatch. The programs in the PLCs must be equal and share a time stamp. Load one and use the key switch transfer for the other one.
  • Mismatched Hardware. The CPU/CRP and CHS modules must use the same firmware. Do not mix ROHS and non ROHS CHS modules.
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