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(b) When using a 32-bit instruction for the link register
For a 32-bit instruction, two consecutive points of the data register (Wn and Wn+1) are the target of the
processing.
The lower 16 bits correspond to the link register number (Wn) specified in the sequence program, and the
higher 16 bits correspond to the specified link register number + 1.
When W12 is specified in the DMOV instruction, W12 represents the lower 16 bits and D13
Example
represents the higher 16 bits.
Figure 9.41 Data transfer with a 32-bit instruction and storage location
Data of -2147483648 to 2147483647 or 0
(The most significant bit in a 32-bit structure is a sign bit.)
(3) Retention of stored data
The data stored in the link register are held until other different data are stored.
Note that the stored data are initialized when the CPU module is powered off or reset.
• Although the number of points for the link register in a CC-Link IE controller network module is 131072 points, the
default value for the link register in the CPU module is 8192 points.
• Although the number of points for the link register of a MELSECNET/H network module is 16384 points, the
default value for the link register in the CPU module is 8192 points.
To use the link register exceeding the above points, change the link register points in the Device tab of the PLC parameter
dialog box in GX Developer or use a file register.
(4) Using the link register in a network system
Network parameters must be set.
The area range that is not set by network parameters can be used as a data register.
Remark
For the network parameters, refer to the following.
Reference manual for each network module
DMOV
K500000 W12
Processing target: W12, W13
W13
Upper 16 bits Lower 16 bits
to FFFFFFFF
can be stored in a two-point area of the link register.
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H
CHAPTER9 DEVICES
W12
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