LSIS XGL-C22A, User Manual, Page: 110 / 299

Chapter 7 XGT Dedicated Communication
7-8
7.2.4 Reading single direct variable (R(r)SS)
▷
This function is used to directly specify and read the PLC device applicably to its data type.
▷
Up to 16 separate devices memory can be read at a time.
(1) Example that XGT client requests reading single direct variable
Classification Head Station no. Instruction Instruction
type
No. of
blocks
Variable
Length
Variable
Name
ㆍㆍㆍ
Tail Frame Check
Frame ENQ 20 R(r) SS 01 06 %MW100
ㆍㆍㆍ
EOT BCC
Hex h05 h3230 h52(72) h5353 h3031 h3036
h254D5731303
0
ㆍㆍㆍ
h04
(2)
Example of response frame of XGT server
(a) In case of ACK response
Classification Head Station no. Instruction Instruction
type
No. of
blocks
No. of
data
Data
.....
Tail
Frame
Check
Frame ACK 20 R(r) SS 01 02 A9F3 ETX BCC
Hex h06 h3230 h52(72) h5353 h3031 h3032 h41394633 h03
(b) In case of NAK response
Classification Head Station no. Instruction Instruction type
Error code
(2 byte)
Tail Frame Check
Frame NAK 20 R(r) SS 1132 ETX BCC
Hex h15 h3230 h52(72) h5353 h31313332 h03 -
(3) Meaning of each item
Classification Description
Number of
Blocks
▶
Specify the number of blocks composed of ‘[Variable Length][Variable Name]’
-Max. setting range : 16 blocks
-Setting range : H01(ASCII value:3031) ~ H10(ASCII value:3130)
Variable Length
▶
Number of letters of Variable Name
-Max. setting range : 16
-Setting range : H01(ASCII value:3031) ~ H10(ASCII value:3130)
Ex.) If Variable Name is %MW0 whose letters are 4, its Variable Length is H04.
If Variable Name is %MW000 whose letters are 6, its Variable Length is H06.
Variable Name
▶
Read device’s address
-Setting range : within 12 letters available to input
-Caution: Others than figure, capital/small letter and ‘%’ are not allowed.
Up to 16 blocks available repeatedly
1 block
Up to 16 blocks available repeatedly
1 block