Mitsubishi MELSEC Q Series Programming Manual page 108

(4) Index modification using extended data register (D) and extended link register (W)
(Universal model QCPU (excluding Q00UJCPU) and LCPU)
Like index modification using data register (D) and link register (W) of internal user device, a
device can be specified by index modification within the range of the extended data register
(D) and extended link register (W).
User Program
User Program
3-18
Index modification in internal
user device
MOV K1234
MOV K1234
Index modification in
extended data register
1) Index modification where the device number crosses over the boundary
between the internal user device and the extended data register (D) or
extended link register (W)
The specification of index modification where the device number crosses over
the boundary between the internal user device and the extended data register
(D) or extended link register (W) cannot be made.
If doing so, an error occurs when the device range check is enabled at index
modification (error code: 4101).
Index modification in internal
user device
MOV K1234
Index modification where the device number
crosses over the boundary between
theinternal user device and the extended data
register is not possible.
Image of D device
Z0=0
D100
D1100
Z0=1000
Z1=0
D20000
D22000
Z1=2000
Image of D device
Z0=0
D100
D20100
Z0=20000
Internal user
device
Extended data
register
Internal user
device
Extended data
register