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Chapter 7 Communication function

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7.1.5 User defined communication for Gm7 series

GM7 Cnet I/F module sets mode and defines protocol in GMWIN(Ver.3.3 or later) differently from other Cnet I/F

modules. For user defined protocol communication, the contents of the protocol to use shall be exactly informed to

communicate data. User-prepared protocol frame can be downloaded to GM7 basic unit via GMWIN(Ver.3.3 or later)

and the saved data is kept inside GM7 basic unit indelibly for use even if powered off. However, when

communication parameters are downloaded as changed, or when data can be no more backup due to lowered

voltage of backup battery than average, damage on protocol frame may occur. For user-defined mode service,

programming via Function Block to control TX/RX in PLC is needed in addition to frame edit.

1) Parameter setting

A) Communication parameters setting

① Open new project file in GMWIN.

9 Be sure to select GM7 of PLC type.

9 Creat new project file respectively for master and slave.

② Select communication parameters in GMWIN parameter and double-click on it to display the figure

below.

LG GLOFA-GM Series User Manual

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