Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 545

Ex.2)
Not detecting "OPERATION ERROR" (error code: 4140) in the ANDE instruction
[Ladder mode]
In the ladder block starting from the step 104, the ANDE<= instruction of the step 105 is not executed when the
M101 (valid data flag) is off.
The ANDE<= instruction of the step 105 is not executed when the M101 is off in the LD instruction of the step 104
in the program above. Therefore, when the M101 is off, "OPERATION ERROR" (error code: 4140) will not be
detected even if a "special value" is stored in D100.
Ex.3)
Detecting "OPERATION ERROR" (error code: 4140) in the ANDE instruction
[Ladder mode]
In the ladder block starting from the step 104, the ANDE<= instruction of the step 106 and the ORE>= instruction
of the step 110 are not executed when the M101 (valid data flag) is off.
However, if the M90 is on in the LD instruction of the step 105, the ANDE<= instruction of the step 106 is
executed. Therefore, even when the M101 is off, "OPERATION ERROR" (error code: 4140) will be detected in
the ANDE<= instruction of the step 106 if the M90 is on and a "special value" is stored in D100.
For the method of avoiding "OPERATION ERROR", refer to Page 544, Appendix 5.4.2 (2).
APPENDICES
[List mode]
[List mode]
A
543