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

7
PROGRAMS REPLACEMENT

7.4 Special Relay Replacement

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

7.4.1 Replacement of A0J2HCPU with QCPU

A special relay different from A0J2HCPU is used with QCPU.
Automatic conversion using the Change PLC type is possible when replacing the A0J2HCPU special
relay (M9000 onwards) with the Basic Model QCPU special relay (SM). (Refer to Section 7.1.2)
Point
Some A0J2HCPU special relays are not compatible with QCPU. The special relay not compatible with
QCPU is converted to a dummy special relay (SM1255)
the PLC type, retrieve the dummy special relay (SM1255) and correct the program if necessary.
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when changing the PLC type. After changing