Special Register Replacement; Replacement Of A0J2Hcpu With Qcpu - Mitsubishi Electric MELSEC-A0J2H Series Handbook

7
PROGRAMS REPLACEMENT

7.5 Special Register Replacement

The special register is an internal register with applications determined within the programmable
controller.
This section explains the replacement of special registers when replacing the A0J2HCPU program with
QCPU.
For details on AnS/QnASCPU and QCPU special registers, refer to the QCPU User's Manual (Function
Explanation, Program Fundamentals) and MELSEC-Q/L Programming Manual (Common Instruction).

7.5.1 Replacement of A0J2HCPU with QCPU

A special register different from A0J2HCPU is used with QCPU.
Automatic conversion using the Change PLC type is possible when replacing the A0J2HCPU special
register (D9000 onwards) with QCPU special register (SD). (Refer to Section 7.1.2)
Point
Some A0J2HCPU special registers are not compatible with QCPU. The special register not compatible
with the Basic model QCPU is converted to a dummy special register (SD1255)
PLC type. After changing the PLC type, retrieve the dummy special register (SD1255) and correct the
program if necessary.
*1
when changing the
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