• GLOBAL > PLC > SPH > Error > 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 indica...
  • No : 1335
  • Displayed Date : 2023/04/25 19:00
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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.
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Answer

This is because the SX bus loop-back plug is not connected. Connect a loop-back plug to the base board.