Dedicated Communication Slave; Introduction - LG GLOFA-GM Series User Manual

Chapter 7 Communication function

7.2 Dedicated communication slave

7.2.1 Introduction

Dedicated communication function as of a protocol built in computer communication module is used to read or write
information and data inside PLC of PC and supplementary devices without additional programming in GLOFA-PLC,
and also used to download/upload PLC program and control PLC (Run/Stop/Pause). Dedicated communication
service can be available independently both for RS-232C and RS-422 according to modes, while operated by slave
only in the system composed of master and slave to respond only when requested by external devices. All frames
used in dedicated communication mode shall not exceed 256 byte with characters of ASCII code used for all the
frames. For multi-drop service, max. 32 stations can be connected. Be careful not to allow repeated station No. to be
set to the same network when setting station No. Communication speed/Stop Bit/Parity Bit/Data Bit of all the Cnet I/F
modules in network shall be surely identical when used in multi-drop.
[Table 7.9] Switch value of Cnet mode which can be set to dedicated communication mode
Mode
Module name
switch
G3L-CUEA
G4L-CUEA
G6L-CUEB
G6L-CUEC
G7L-CUEB
N/A
G7L-CUEC
Remark
[Note 1] In interlocking mode, RS-232C and RS-422 channels are operated via identical station set to RS-232C
channel.
[Note 2] In stand-alone mode, RS-232C and RS-422 channels are operated via different station numbers res-
pectively.
RS-232C
1
Dedicated mode
3
Dedicated mode
4
User defined communication
5
Dedicated communication
7
GMWIN
9
1
9
Dedicated communication slave mode
Operation mode
RS-422
Dedicated mode
Dedicated mode
Dedicated communication
User defined communication
Dedicated mode
On-line mode Ver. 2.0
Dedicated mode
On-line mode Ver. 2.0
7-34
Remark
Interlocking mode [Note 1]
Stand-alone mode
[Note 2]
Frame Editor
Frame Editor
Set by GMWIN