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When I downloaded a program to the CPU module, a fatal fault occurred. I checked fault diagnosis and found both the CPU and I/O modules were indicated as being unconnected.
When I downloaded a program to the CPU module, a fatal fault occurred. I checked fault diagnosis and found both the CPU and I/O modules were indicated as being unconnected.
Answer
This is because the SX bus loop-back plug is not connected.
Connect a loop-back plug to the base board.