LG Electronics 120S user manual Plc

Chapter 8 Communication Functions

(3) Set the contents as follows.

Item	Setting contents
Station No.	Set a number between 0 to 31 (Don’t assign no. 0 as broadcasting station lest it may be a cause
	for mistaken operation)
Baud Rate	Set one from 1200, 2400, 4800, 9600, 19200, 38400, or 57600 bps.
	Set 7 or 8.
Data Bit	ASCII mode: Set as 7 bits.
	RTU mode: Set as 8 bits.
Parity Bit	Set as one of None, Even, or Odd.
	Set 1 or 2 bit(s).
Stop Bit	When parity bit is set: Set as 1 bit.
	When parity bit isn’t set: Set as 2 bits.
	• RS232C Null Modem or RS422/485 : It’s a communication channel for the communication,
	using MASTER-K120S main unit’s built-in communication and Cnet I/F module (G7L-CUEC).
	• RS232C Modem (Dedicated Line) : It’s to be selected for the communication, using an
Communication	dedicated modem with Cnet I/F module (G7L-CUEB).
	• S232C Dial Up Modem : It’s to be selected for the general communication connecting through
Channel
	the telephone line by dial up modem and Cnet I/F module (G7L-CUEB).
	• Note : Using Cnet I/F module (G7L-CUEB) supporting RS232C, RS232C dedicated or dial-up
	modem communication can be done, but not through Cnet I/F module (G7L-CUEC)
	supporting RS422/485.
	• It’s the time waiting a responding frame since the master MK80S main unit sends a request
	frame.
Time out in Master	• The default value is 500ms.
Mode	• It must be set in consideration of the max. periodical time for sending/receiving of the master
	PLC.
	• If it’s set smaller than the max. send/receive periodical time, it may cause communication error.
Modbus Master/	If it is set as the master, it’s the subject in the communication system. If it’s set as the slave, it
Slave	only responds to the request frame of the master.
Transmission	Select ASCII mode or RTU mode.
Mode

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