App - 53
APPENDIX
Appendix4.2 Special relays and special registers with different specifications
The A2USHCPU-S1, A2USCPU(S1) and A2ASCPU(S1/S30) do not use the following
special relays and special registers.
Although no error occurs even if the following special relays and registers in the original
program remains in the newly created program (they will be ignored), it is recommended to
delete them from the program.
• M9010 ........... Turns ON when an operation error occurs and OFF when the error
is removed.
• M9053 ........... Turns ON when executing the EI instruction with the link refresh
enable instruction or the program interrupt enable instruction and
the DI instruction with the link refresh disable instruction or the
program interrupt disable instruction.
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