Link Registers (W) - Mitsubishi Electric MELSEC-Q Series User Manual

10 DEVICES

10.2.13 Link registers (W)

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(1) Definition
(a) A link register is the Basic model QCPU memory used to refresh the Basic
model QCPU with data from the link registers (LW) of intelligent function
modules including MELSECNET/H network module.
Link registers are used to store numeric data (-32768 to 32767, or 0000
FFFF ).
H
Basic model QCPU
Link register
W0
When used outside the MELSECNET/H network system's range, link
registers can serve as data registers.
(b) Link registers consist of 16 bits per point, with reading and writing executed
in 16-bit modules.
b15
Wn
(c) If the link registers are used for 32-bit instructions, the data is stored in
registers Wn and Wn + 1. The lower 16 bits of data are stored in the link
register No. (Wn) designated in the sequence program, and the higher 16
bits of data are stored in the designated register No. + 1 (Wn + 1).
For example, if link register W12 is designated at the DMOV instruction, the
lower 16 bits are stored in W12, and the upper 16 bits are stored in W13.
In two link register points, -2147483648 to 2147483647 or 0
FFFFFFFF
(d) Data stored by the sequence program is maintained until another data save
operation occurs.
REMARK
The MELSECNET/H network module has 16384 link register points. The Basic
model QCPU has 2048 link register points. When subsequent points after Point
2048 are used for link registers, change a "number of points" setting of link registers
on the Device sheet of the PLC Parameter dialog box.
Link refresh
DMOV K500000 W12
data can be stored.
H
MELSECNET/H network module
Link register
LW0
b0
Processing object: W12, W13
W13 W12
Upper 16 bits Lower 16 bits
MELSEC-Q
to
H
Link refresh
setting range
to
H
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