Chapter 7 XGT Dedicated Protocol
7-12
(3) Individual writing of device (W(w)SS)
(a) Purpose
This is a function that writes the PLC device memory directly specified in accord with memory data
type.
(b) PC request format
Format name
Header Station No.
Command
Command
type
Number of
blocks
Device
Length
Device Name
Data
.....
Tail
Frame
check
Frame (Example)
ENQ H20 W(w) SS H01 H06 %MW100 H00E2 EOT BCC
ASCII value H05 H3230 H57(77) H5353 H3031 H3036
H254D573130
30
H30304532 H04
1 block (setting can be repeated up to max. 16 blocks)
Item Description
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.
Number of
blocks
This specifies how much of the blocks composed of "[device length][device
name]" are in 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
Length
(Name length of
device)
This indicates the number of name's characters that means device, which is
allowable up to 16 characters. This value is one of ASCII converted from hex
type, and the range is from 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 is allowable to
be entered.
Data
If the value to be written in %MW100 area is H A, the data Format must be
H000A. If the 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.
▪Example 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.
Device data types of each block must be the same
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).
Note
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