374
4.2.14 Link special register (SW)
The link special register (SW) is used to store communication status data and error data of intelligent function modules,
such as CC-Link IE module and MELSECNET/H module.
Because the data link information is stored as numeric data, error locations and causes can be checked by monitoring
the link special register.
(1) Number of link special register points
The points for the link special register in the CPU module are 2048 (SW0 to SW7FF). However, the number of
points can be changed in the Device tab of the PLC parameter dialog box. ( Page 446, Appendix 1.2.8) The
link special register points for intelligent function modules (such as CC-Link IE modules and MELSECNET/H
modules) are 512. Assign the link special register points as shown below. This enables data in the link special
register (SW) of the CC-Link module to be refreshed to the link special relay (SW) of the CPU module.
For details of the link special register, refer to the manual for each intelligent function module that has the link
special register.
SW200
SW3FF
SW400
SW5FF
SW600
SW7FF
SW0
SW1FF
Link special register
For 1st network module
For 2nd network module
For 3rd network module
For 4th network module
SW800
SW9FF
For 1st CC-Link module
512
points
512
points
512
points
512
points
512
points
2560
points
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