LG Electronics 120S user manual Individual writing of deviceWwSS

Chapter 8 Communication Functions

3) Individual writing of device(W(w)SS)

(1) Introduction

This is a function that writes the PLC device memory directly specified in accord with memory data type.

(2) PC request format

Format name	Header	Station No.	Command	Command	Number of	Device
				type	blocks	Length
Frame (Example)	ENQ	H20	W(w)	SS	H01	H06
ASCII	H05	H3230	H57(77)	H5353	H3031	H3036
value

				Tail	Frame
Device Name		Data	.....
					check
%MW100		H00E2		EOT	BCC
H254D5731		H30304		H04
3030	532

	1 block(setting can be repeated up to max. 16 blocks)
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.
	This specifies how much of the blocks composed of "[device length][device name]" are in
Number of blocks	this request Format. This can be set up to 16. Therefore, the value of [Number of blocks]
	must be set between H01(ASCII value:3031)-H10(ASCII value:3030).
Device	This indicates the number of name's characters that means device, which is allowable up to
length(Name	16 characters. This value is one of ASCII converted from hex type, and the range is from
length of device)	H01(ASCII value:3031) to H10(ASCII value:3130).
device	Address to be actually read is entered. This must be ASCII value within 16 characters, and
	in this name, digits, upper/lower case, and '%' only are allowable to be entered.
	If the value to be written in %MW100 area is H A, the data Format must be H000A. If the
Data	value to be written in %MW100 area is H A, the data Format must be H000A. In data area,
	the ASCII value converted from hex data is entered.

Ex.1

If type of data to be currently written is WORD, the data is H1234, ASCII code converted value of this is "31323334" and this content must be entered in data area. Namely, most significant value must be sent first, least significant value last.

Remark

1)Device data types of each block must be the same.

2)If data type is Bit, the data to be written is indicated by bytes of hex. Namely, if Bit value is 0, it must be indicated by H00(3030), and if 1, by H01(3031).

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