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9.2.13 Link register (W)
(1) Definition
The link register (W) is a memory in the CPU module, which is refreshed with link register (LW) data of an
intelligent function module such as a MELSECNET/H network module.
In the link register, numeric data (-32768 to 32767, or 0000
H to FFFFH) are stored.
(2) Bit structure of the link register
(a) Bit structure and read/write unit
One point of the link register consists of 16 bits, and data can be read or written in units of 16 bits.
● Link register data are handled as signed data.
In the case of the hexadecimal notation, 0000
H to FFFFH can be stored. However, because the most significant bit
represents a sign bit, decimal values that can be specified are -32768 to 32767.
● The area range in the link register, which is not used for a MELSECNET/H network module, can be used as a data
register.
Figure 9.40 Link refresh
Figure 9.41 Bit structure of the link register
Link registerLink register
W0
LW0
CPU module MELSECNET/H network module
Link refresh
Link refresh
Wn
b15
to
b0
setting range
