Storing 32-Bit Data In Index Registers - Mitsubishi MELSEC-A Series Programming Manual

3. INSTRUCTION STRUCTURE

3.8.5 Storing 32-bit data in index registers

It is possible to store 32-bit data in the index registers (Z1 to Z6, V1 to V6) extended
by the AnA, A2AS, AnU, QCPU-A (A Mode) and A2USH board.
The following index registers are used in pairs to store 32-bit data.
1) Z1 and V1
2) Z2 and V2
Since Zn is regarded as the device for lower 16 bits, Vn cannot be used in 32-bit
3) Z3 and V3
instructions.(Programs cannot be entered.)
4) Z4 and V4
5) Z5 and V5
6) Z6 and V6
Any pairs other than those mentioned above cannot store 32-bit data. If one of
paired devices is specified for index qualification in an instruction, data in such index
register is regarded as 16-bit data for index qualification.
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MELSEC-A