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Appendix 4 Precautions For Utilizing The Existing Sequence Programs For The Qcpu-a - Mitsubishi Electric MELCEC Q Series User Manual

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APPENDICES
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
QCPU-A.
POINT
(1) The following three 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 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.
Item
Q06HCPU-A
LED, LEDC
No error occurs.
instruction
CHG
Can be used.
instruction
(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
function.
Q02(H)CPU-A
A2USHCPU-S1
"CAN'T EXECUTE(P)" (error code
134) occurs.
App - 48
A2USCPU(S1)
"INSTRCT CODE
ERR." (error code
101) occurs.

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