Communication I/F Module - LG MASTER-K 120S Series User Manual

Chapter 8 Communication Functions

8.5.2 Communication I/F module

MASTER-K120S series supports various kinds of communication I/F module.
In this time, Built-In Cnet in main unit must be set to 'Off' as below and only one communication module can be extended
BUILT_IN CNET
ON
ROM MODE
1) Usage of G7L-CUEB
Using G7L-CUEB, MASTER-K120S can connect to other PLC by dedicated modem or dial-up modem
• Set TM/TC switch to 'On' when uses remote connection function
• Set TM/TC switch to 'Off' when uses data communication function
• Data communication and remote connection function are not allowed simultaneously
• Data communication mode supports every communication protocol but In remote connection function supports dedicated
protocol only.
2) Usage of G7L-CUEC
Channel 0 can be used as RS-422/485 I/F by using G7L-CUEC I/F module
Operating method is same as built-in Cnet interface and wiring is as below
RDA
RDB
SDA
SDB
SG
Master
OFF
Must be off
RDA
RDB
SDA
SDB
SG
Slave
Wiring Example : RS-422 I/F
TM/TC Switch
RDA
RDB
SDA
SDB
SG
Slave
8-76
RDA
RDB
SDA
SDB
Terminating
SG
resistor
Slave