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CHAPTER 1 OVERVIEW
This manual provides information on the specifications, functions, preoperational procedure, programming and
troubleshooting of the QJ71GP21-SX and QJ71GP21S-SX CC-Link IE Controller Network modules (hereinafter
referred to as CC-Link IE Controller Network module).
When applying a program example introduced in this manual to the actual system, make sure to examine the
applicability and confirm that it will not cause system control problems.
The CC-Link IE Controller Network module allows connection of MELSEC-Q series programmable controllers to the
CC-Link IE Controller Network, realizing high-speed and large-volume data communications between the controllers in
the network.
● The existing MELSECNET/G network module has been integrated into the CC-Link IE Controller Network module.
● The CC-Link IE Controller Network is an improved system that has a higher processing speed and a larger data capacity
than the MELSECNET/H network system (PLC to PLC network).
The Appendix in this manual describes the comparison between CC-Link IE Controller Network and MELSECNET/H.
( Page 612, Appendix 4)
● One network (of the same network No.) cannot contain both CC-Link IE Controller Network and MELSECNET/H
modules. (Different networks must be used.)
• CC-Link IE Controller Network module: Used for CC-Link IE Controller Network
• MELSECNET/H module: Used for MELSECNET/H or MELSECNET/10
Duplex loop
High-speed and
large-volume data
communications
CC-Link IE Controller Network
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