Mitsubishi MELSEC QS Series, User Manual

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9
DEVICE EXPLANATION
9
- 30 9.2 Internal User Devices
9.2.11 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
The number of device points for link registers is 16384 in the CC-Link IE controller
network module and MELSECNET/H module, but 2048 in the CPU module by
default.
To use link registers exceeding the device point range described above, change
the number of device points for link registers on the Device setting tab of PLC
parameter in GX Developer.
Diagram 9.35 Data transfer by 32-bit instruction and storage destination
K500000 W12 DMOV
W13 W12
Processing object: W12, W13
Upper 16 bits Lower 16 bits