Replacement Of Special Register; Replacing The Anscpu With The Qcpu; Replacing The Qnascpu With The Qcpu - Mitsubishi Electric MELSEC Q Series Handbook

7
REPLACEMENT OF PROGRAM

7.5 Replacement of Special Register

A special register is an internal register that has a set application in a programmable controller.
This section explains how to replace special register when replacing the AnSCPU programs for the
QCPU.
Some AnS/QnASCPU special registers not compatible with the QCPU, for details please refer to QCPU
Users Manual (Function Explanation, Program Fundamentals)/Programming Manual (Common
Instruction).

7.5.1 Replacing the AnSCPU with the QCPU

The QCPU uses a different special register from the one for the AnSCPU.
With " Change PLC type " , the automatic conversion is applied to the replacement of the AnSCPU.
special register (D9000 and after) with the QCPU special register (SD).
Point
Some AnSCPU special registers are not compatible with the QCPU.
Those special registers not compatible with the QCPU are converted to dummy special registers
(SD1255) when changing programmable controller type. Search the dummy special registers (SD1255)
and correct the programs as required.

7.5.2 Replacing the QnASCPU with the QCPU

Basically, special registers for the QnASCPU can be used without modification in the QCPU.
Note that, however, some of them are not compatible with the QCPU.
*1 When programs for the QnASCPU are replaced with those for the Universal model QCPU by "Change PLC type", devices
for the QnASCPU, SM1000 to SM1255, and SD1000 to SD1255, are replaced with those for the QCPU.
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*1