Mitsubishi Electric MELSEC Q Series Programming Manual page 230

6 TROUBLESHOOTING
Error step
(2) Confirmation of step No. where error occurred and correction of
sequence program
The step where an error occurred can be confirmed using the PLC comparison
function.
• Edit data : Select the original sequence program file of GX Works2/
GX Developer.
• Module data : Select the sequence program file where an error occurred
"ERRLAD-0" of the Motion CPU.
After performing the PLC comparison, the contents of the mismatch are
displayed as the example below.
GX Works2 side
This is a step where the NOP instruction part of the Motion CPU is faulty. Double-
clicking the corresponding part displays the corresponding part of the file of
GX Works2/GX Developer to edit. Then correct the sequence program and write
it in the Motion CPU again by PLC write.
Verify
Motion CPU side
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<Screen: GX Works2>