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MELSEC-Q
11 TROUBLESHOOTING
11.2.16 Flowchart for when UNIT VERIFY ERR. occurs
The following shows the flowchart to be followed when UNIT VERIFY ERR. occurs at
PLC power-on or during operation.
Is the module of
the applicable slot installed
properly?
Install the module properly.
Is the "ERR." LED
turned off?
UNIT. VERIFY ERR. occurs.
NO
YES
NO YES
YES
NO YES
NO
Replace the applicable module.
Error detection
Proper operation
Are all the
extension cables of the
base module connected
properly?
Check the slot where error occurred
with the GX Developer.
Replace the CPU module.
Replace the applicable
base unit.
Completion
Hardware fault
Please consult your local Mitsubishi
service center or representative,
explaining a detailed description
of the problem.
Error detection
Error detection
Proper operation
Proper operation
Is the "ERR." LED
turned off?
Install the extension cable properly.