Appendix4 Precautions for Utilizing the Existing Sequence Programs for the QCPU-A
This section explains the precautions for utilizing the sequence programs created for the
A1SHCPU, A2SHCPU to the QCPU-A.
The sequence programs created for the A2USCPU(S1) can directly be used for the
(1) The following three instructions dedicated to the AnUCPU can be used by
adding to the existing sequence program.
.....For writing word devices of MELSECNET/10 connection station
.....For reading word devices of MELSECNET/10 connection station
.....For MELSECNET/10 network refresh instruction
(2) All of the sequence programs for the A1SHCPU and A2SHCPU can be used.
(3) The following instructions cannot be used by the QCPU-A as they cannot be
used by the A2USCPU(S1), A2USHCPU-S1. However, note that the
processing is different between the A2USCPU(S1) and QCPU-A when they
are mistakenly operated.
No error occurs.
Can be used.
(4) When frequently performing the FROM/TO instruction for the special function
module in short scan time, it may cause an operation error in the target
special function module.
When executing the FROM/TO instruction, match the processing time and
conversion time for the special function module using timer or constant scan
"CAN'T EXECUTE(P)" (error code
App - 48
ERR." (error code