Toshiba TR PMIU, User Manual, Page: 67 / 182

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3 3 3 3. . . .3 3 3 3. . . .6 6 6 6
Index modification
You can change the tag address of some instruction according to the value of Index register. This called “Index
modification”. If you use index modification, select instruction and set options in the properties of the
instruction (shown in right side of ladder editing area).
If “Tag Index Type” exists in the instruction property, you can use
index modification for the tag address. Click “Tag Index Type” of
operand, and select Index tag to use.
There is 3 index tags (I0000, J0000, K0000), you cannot add or delete.
“None” means that index modification is not used. Allowable range of
index register is from -32768 to 32767.So, you can move the address in
this range.
Refer above image. Index modification is used to destination address of MOV instruction, and used Index
register is “I 0000”. In this case…
Value of I 0000 = “0” The data “2501” is stored in D 0007 (Original destination address).
Value of I 0000 = “4” “2501” is stored in D 0011 (Destination address moves to 4 address backward).
Value of I 0000 = “-5” “2501” is stored in D 0011 (Destination address moves to 5 address forward).
You can use this to double word register. In this case, when original address is D0201xD0200 and value of index
register is “1”, the address is moved to D0202xD0201, if value of index register is “-2”, address is moved to
D0199xD0198. Note that the address moves by every one word (register length is not considered).
Note that tag address range is not checked. Do not exceed the range of the Tag address by the index
modification.