LG Electronics 120S user manual Continuous writing of deviceWwSB

Chapter 8 Communication Functions

4) Continuous writing of device(W(w)SB)

(1) Introduction

This is a function that directly specifies PLC device memory and continuously writes data from specified address as much as specified length.

(2) Request format

Format

Header

Station

Comman

Comma

Device

Device

Number of data

Data

Tail

Frame

name

No.

d

nd type

Length

(Max.128 Byte)

check

Frame

H10

W(w)

SB

H06

%MW100

H02

H11112222

EOT

BCC

(Example)

ENQ

ASCII

H3130

H57(77)

H5342

H3036

H254D57

H3032

H31313131

H04

value

H05

313030

32323232

Remark

1)Number of data specifies the number according to the type of device. Namely, if the data type of device is WORD, and number of data is 5, it means that 5 WORDs should be written.

2)Number of data can be used up to 240Bytes(120 Words).

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.
Device	This indicates the number of name's characters that means device, which is allowable up to
length(Name length	16 characters. This value is one of ASCII converted from hex type, and the range is from
of variable)	H01(ASCII value:3031) to H10(ASCII value:3130).
device	Address to be actually read. This must be ASCII value within 16 characters, and in this
	name, digits, upper/lower case, and '%' only are allowable to be entered.

8-18