Mitsubishi MELSEC-A Series Programming Manual page 359

8. MICROCOMPUTER MODE
REMARK
Communication of input/output information with an input/output module is executed only in the
address range indicated below.
A1FX: X/Y20 to FF
A1SH, A1SJH: X/Y0 to FF
A2SH: X/Y0 to 1FF
A2SH-S1: X/Y0 to 3FF
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MELSEC-A