LG Electronics 120S Reading PLC StatusRST, Pause Debug, Mode Bit Local Remote Connection

Chapter 8 Communication Functions

7) Reading PLC Status(RST)

(1) Introduction

This is a function that reads flag list including operating status of PLC and error information.

(2)	PC request Format
	Format name	Header		Station No.	Command	Command type	Tail	Frame check
	Frame (Example)	ENQ		H0A	R(r)	ST	EOT	BCC
	ASCII value	H05		H3041	H52(72)	H5354	H04
	Item					Explanation
	BCC		When command is lowercase(r), only one lower byte of the value resulted by adding 1 Byte
			each to ASCII values from ENQ to EOT is converted into ASCII and added to BCC.
(3)	Response Format (ACK response)

Format name	Header	Station No.	Command	Command
				type
Frame (Example)	ACK	H0A	R(r)	ST
ASCII value	H06	H3041	H52(72)	H5354

PLC status data

(Hex 20 Byte)

Status data Format

[※1]

Tail	Frame
	check
ETX	BCC
H03

Item	Explanation
BCC	When command is lowercase(r), only one lower byte of the value resulted by adding 1 Byte
	each to ASCII values from ACK to ETX is converted into ASCII and added to BCC, and sent.

※1 PLC status data: data Format is 20 bytes in hex Format and converted into ASCII code. Its contents are constituted as below table after converting ASCII code into hex data.

1		2	3	4		5		6		7	8	9		10	11	12	13	14	15	16		17	18		19	20
		Null			CPU		Ver. CPU				null	connection							Null
					Type			No. Mode
• CPU Type
	CPU Type			K120S					K80S			K200SA			K200SB			K200SC		K300S					K1000S
		Code			42				41				3A			3B		3C			33			32

•Version No. Ex) Bit

0 0 0 1 0 0 1 0

•CPU Mode Ex) Bit

- - - 0 0 0 0 -

Version 1.2

•Connection Ex) Bit

- - - - - - 0 0

Bit 1	Bit 2	Bit 3	Bit 4
Stop	Run	PAUSE	DEBUG
Mode	Mode	Mode	Mode

Bit 0	Bit 1
Local	Remote
connection	connection

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