Mitsubishi QJ71LP21 Reference Manual page 230

8 TROUBLESHOOTING
<Cause 1>
<Troubleshooting 1>
<Cause 2>
<Troubleshooting 2>
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M/S error or SW error is assumed.
1) Check for duplicate station number, remote master station duplication
or switch setting error.
2) Take corrective action according to the contents of SW47 and the
error code stored in SW48.
PLC CPU or remote I/O station error is assumed.
Check the PLC CPU or remote I/O station error in the PLC diagnostics
and restore the CPU to normal. (See Section 8.2.1.)
E
MELSEC-Q
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