Mitsubishi Electric MELSEC iQ-R-R04CPU - Device for Which Index Modification Can be Performed; Index Register Setting

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21 DEVICES
21.8 Index Register (Z/LZ)
Device for which Index modification can be performed
The following table lists the devices that can be targeted for index modification.
*1 The devices can be used for the contact, coil and current value.
*2 For network numbers and the specification source of I/O numbers, 32-bit index modification cannot be performed.
*3 When the devices are used as an interrupt pointer, index modification cannot be performed.
*4 If specifying the devices with the programmable controller CPU or Process CPU, check the versions of the CPU module and
engineering tool used. ( Page 1008 Added and Enhanced Functions)
Note that the devices cannot be specified with the SIL2 Process CPU or Safety CPU.
Index register setting
The following window allows to specify the number of points for the index register (Z) and long index register (LZ) and the
range where they are used as a local device. The total number of points of the index register (Z) and the long index register
(LZ) must be set to 24 words.
[CPU Parameter]  [Memory/Device Setting]  [Index Register Setting]
Window
Displayed items
Item Description
16-bit index modification X, Y, M, L, B, F, SB, V, S
*4
, T
*1
, LT
*1
, ST
*1
, LST
*1
, C
*1
, LC
*1
, D, W, SW, SM, SD, Jn\X, Jn\Y, Jn\B, Jn\SB, Jn\W,
Jn\SW, Un\G, U3En\G, U3En\HG, R, ZR, RD, P
*3
, I
*3
, BLn\S
*4
, J, U, K, H
32-bit index modification M, B, SB, T
*1
, LT
*1
, ST
*1
, LST
*1
, C
*1
, LC
*1
, D, W, SW, Jn\B
*2
, Jn\W
*2
, Un\G
*2
, U3En\G
*2
, U3En\HG
*2
, R, ZR, RD, K, H
Item Description Setting range Default
Number of
points
setting
Total Points Check the total number of points for index register and
long index register.

Index register (Z) Set the number of points for the index registers. 0 to 24 points (in
two-point
increments)
20 points
Long index register (LZ) Set the number of points for the long index registers. 0 to 12 points (in
one-point
increments)
2 points
Local
setting
Number of
points
setting
Local Index register (Z) Set the number of points for index registers used as a
local device. Set within the range of the index register.
0 to 24 points (in
one-point
increments)
0 points
Local long index register (LZ) Set the number of points for long index registers used as
a local device. Set within the range of the long index
register.
0 to 12 points (in
one-point
increments)
0 points
Head Index register (Z) Set the start number for the local index registers. Set
within the range of the index register.
0 to 23 0
Long index register (LZ) Set the start number for the local long index registers.
Set within the range of the long index register.
0 to 11 0