Appendix4.1 Instructions With Different Specifications - Mitsubishi MELSEC-A A2USHCPU-S1 User Manual

APPENDIX

Appendix4.1 Instructions with different specifications

This section explains how to modify the sequence program when instructions with
different specifications are used.
Basically, the instructions which are not listed in this section do not require
modifications.
(1)
(2)
(3)
(4)
CHK instruction.......Modifications are required when the A1SHCPU or A2SHCPU is
used in the refresh mode.
DI/EI instruction ....... Modifications are required when the special relay M9053 is ON.
• When M9053 has been turned ON, the Enable/Disable setting of the link refresh
instruction (EI, DI) are excutable.
• As the A2USHCPU-S1, A2USCPU(S1) and A2ASCPU(S1/S30) perform the link
refresh in the END processing, enabling or disabling the link refresh during the
sequence program execution is not allowed.
Therefore, modify the sequence program.
LEDA/LEDB instruction
SUB, SUBP instruction ....... Unusable
• As the A2USCHCPU-S1, A2USCPU(S1) and A2ASCPU(S1/S30) cannot store the
microcomputer program, the SUB instruction is inexecutableA2USHCPU-S1,
A2USCPU(S1).
• For use in the A2USHCPU-S1,A2USCPU(S1) or A2ASCPU(S1/S30), all the data
processed in the microcomputer program area must be changed into those of the
dedicated instrutions.
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