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(4) Index modification using extended data register (D) and extended link register (W)
(Universal model QCPU(except Q00UJCPU))
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).
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).
MOV K1234
MOV K1234
User Program
Z0=0
Z0=1000
Z1=0
Z1=2000
Index modification in internal
user device
D100
D20000
D1100
D22000
Index modification in
extended data register
Image of D device
Internal user
device
Extended data
register
MOV K1234
User Program
Z0=0
Z0=20000
Index modification in internal
user device
D100
D20100
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
Internal user
device
Extended data
register