Mitsubishi MELSEC LJ71C24, User Manual

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6 SETTING AND WIRING
Item When the "Current Value" is 1 (ON) Corrective action
Error in the CPU module. Remove errors in the CPU module.
Insufficient power supply capacity. Examine the power supply capacity.
Module is not connected correctly. Reinstall the module properly.
CH C/N
Error in the cable, CPU module, or
the C24.
Check each module and remove the
cause of the error.
Reconnect the cable correctly.
Reinstall the module properly.
CH ERR.
CH1: CH1 side communication error
CH2: CH2 side communication error Reconnect the cable correctly.
Examine the test wiring connection.