Mitsubishi MELSEC-WS series, User Manual

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Chapter 10
87
Diagnostics
Table 52:
Error codes and error messages of the MELSEC-WS safety controller and possible rectification measures
*1 After one of the dual channel inputs is set to ON and another is OFF, when the discrepancy time
passes, “Discrepancy error at dual channel input Ii” should occur. This discrepancy can be cleared
when both inputs turn OFF (the left side figure below). However both inputs turn ON during the
discrepancy, it is not cleared and this error should occur (the right side figure below).
Behavior of a discrepancy error
*2 “Unequal input data from safety I/O module” may occur by following signal inputs.
1) “A dual channel input has 2 single dips (high to low) with a time distance of 2ms.”
Behavior of unequal input data
2) “A signal channel input changes state in intervals of 4ms for a duration of 40ms or more.”
Behavior of unequal input data