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

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REPLACEMENT OF PROGRAM

7.4 Replacement of Special Relay

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

7.4.1 Replacing the AnSCPU with the QCPU

The QCPU uses a different special relay from the one for the AnSCPU.
With " Change PLC type " , the automatic conversion is applied to the replacement of the AnSCPU
special relay (M9000 and after) with the QCPU special relay (SM). (Refer to Section 7.1.2)
Point
Some AnSCPU special relays are not compatible with the QCPU.
Those special relays not compatible with the QCPU are converted to dummy special relays (SM1255)
when changing programmable controller type. Search the dummy special relays (SM1255) and correct
the programs as required.

7.4.2 Replacing the QnASCPU with the QCPU

Basically, special relays 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.
*1
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