Mitsubishi MELSEC Q Series - Page 109

4 INTELLIGENT COMMUNICATION MODULE REPLACEMENT
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4.5.2 Buffer memory
(1) Replacement of intelligent communication modules AD51H-S3/A1SD51S
There is no difference between the QD51(-R24) and the AD51H-S3/A1SD51S.
(2) Replacement of intelligent communication module AD51-S3
No difference is identified between the QD51(-R24) and the AD51-S3.