10
DEVICE EXPLANATION
10
- 45
10.2 Internal User Devices
10.2.13 Link register (W)
(b) When link register is used for 32-bit instruction
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 in the DMOV instruction, the lower
16 bits are stored in W12, and the upper 16 bits are stored in W13.
Two link registers can store a range of numeric data from -2147483648 to
2147483647 or from 0
H
to FFFFFFFF
H
. (The most significant bit in a 32-bit
configuration is a sign bit.)
(3) Holding of stored data
Data stored by the link register is maintained until another data is save.
The data stored in the link register is initialized when the PLC is powered OFF or the
CPU module is reset.
POINT
• Although the number of device points for link registers in the CC-Link IE
controller network module is 131072 points, the default number of points
for link registers in the CPU module is 2048 points (Basic model QCPU)
or 8192 points (High Performance model QCPU, Process CPU,
Redundant CPU, and Universal model QCPU).
• Although the number of device points for link registers in the
MELSECNET/H network module is 16384 points, the default number of
points for link registers in the CPU module is 2048 points (Basic model
QCPU) or 8192 points (High Performance model QCPU, Process CPU,
Redundant CPU, and Universal model QCPU).
To use link registers exceeding the point described above, change the device
point setting for link registers on the Device tab of PLC parameter in GX
Developer or use file registers.
Figure 10.41 Data transfer by 32-bit instruction and storage destination
K500000 W12
DMOV
W13
W12
Processing object: W12, W13
Upper 16 bits Lower 16 bits
