App - 51
APPENDIX
Appendix4 Precautions for Utilizing the Existing Sequence Programs for A2USHCPU-S1,
A2USCPU(S1), or A2ASCPU(S1/S30)
This section explains the precautions for utilizing the sequence programs created for the
A1SHCPU, A2SHCPU to the A2USHCPU-S1, A2USCPU(S1), A2ASCPU(S1/S30).
POINT
(1) The following 3 instructions dedicated to the AnUCPU can be used by adding
to the existing sequence program.
ZNWR instruction
.......... For writing word devices of MELSECNET/10 connection station
ZNRD instruction
.......... For reading word devices of MELSECNET/10 connection station
ZCOM instruction
.......... For MELSECNET/10 network refresh instruction
(2) All of the sequence programs for the A1SHCPU and A2SHCPU can be used.
(3) The following instructions are inexecutable for the A2USHCPU-S1,
A2USCPU(S1) and A2ASCPU(S1/S30).
Note that, if the instructions are used by mistake, they are handled differently
among the A2USHCPU-S1, A2USCPU(S1) and A2ASCPU(S1/S30).
(4) When frequently executing the FROM/TO instruction to special function
module in short scan time, the targeted module may not be processed
normally.
When executing the FROM/TO instruction, match the processing time and
conversion time of the special function module using timer or constant
scanning.
Item A2USHCPU-S1
A2USCPU(S1),
A2ASCPU(S1/S30)
LED, LEDC instruction No error occurs. "INSTRCTCODE ERR." occurs.
CHG instruction Error code 13 occurs. Error code 10 occurs.
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