Index Modification; For Models With Extended Index Modification - Mitsubishi Electric M800VW Series Programming Manual

M800V/M80V Series PLC Programming Manual (1/2)
6 Explanation of Instructions and Functions

6.4 Index Modification

6.4 Index Modification
Index modification is an indirect setting made by using an index register.
When an index modification is used in a sequence program, the device to be used will be [the device number designated
directly] plus [the contents of the index register].
For example, if D2Z1 has been designated, and the content of Z1 is 3, D(2+3), or D5, will be the designated device.

6.4.1 For Models with Extended Index Modification

 Index register (Z0 to Z13) can be set from -32768 to 32767 with sign.
 Index modification is available in most instructions. (Refer to each instruction's explanation for specification details of
instructions.)
Methods for using index register
 Transferring data to index register
MOV
Kn or Hn is used.
 Example of modification
X0
MOV K-1
X0
MOV D10Z0 Z0
↓
Index qualification
IB-1501667-B
MOV Kn Zn
Z0 to Z13
Z0 -1 is stored in Z0
"D10Z0 = D{10+(-1)} = D9"
data is stored in D0
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