Mitsubishi MELSEC-Q/L Programming Manual page 98

(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
MOV K1234
MOV K1234
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).
User Program
MOV K1234
Index modification where the device number
crosses over the boundary between the
internal user device and the extended data
96
Index modification in internal
user device
Z0=0
Z0=1000
Z1=0
Z1=2000
Index modification in
extended data register
Index modification in internal
user device
Z0=0
Z0=20000
register is not possible.
Image of D device
Internal user
D100
device
D1100
Extended data
D20000
register
D22000
Image of D device
Internal user
D100
device
Extended data
D20100
register