LG GLOFA-GM Series User Manual page 304

Chapter 8 Exercising program
User's definition
8.7.2
Example of protocol-defined communication between GM7 basic units is described in system configuration as below.
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GM7 basic unit
(Master : station No.0)
Data in M area of master station is sent to slave station, successively saved in M area as received by slave
station, output to direct variable, and then transmitted to the master station again as processed.
Master saves the received data to M area again, outputs to direct variable, processes and then sends the
data to slave station again repeatedly.
G7E-DR10A G7L-CUEC
8-53
RS-422/485 communication cable
GM7 basic unit
(Slave : station No.1)
G7L-CUEC