LSIS XGL-C22A, User Manual, Page: 115 / 299

Chapter 7 XGT Dedicated Communication
7-13
7.2.6 Reading direct variable continuously (R(r)SB)
This function is used to read the data of PLC device continuously as many as specified from the address.
(1) XGT client: Request frame to read continuous data
Classification Head
Station
no. Instruction Instruction type
Variable
Length
Variable
Name
No. of data
(Max. 240 byte)
Tail
Frame
Check
Frame ENQ 10 R(r) SB 06 %MW100 05 EOT
BCC
Hex h05 h3130 h52(72) h5342 h3036 h254D57313030 h3035 h04
(2) XGT server: Response frame
(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 10 R(r) SB 01 02 1122 ETX BCC
Hex h06 h3130 h52(72) h5342 h3031 h3032 h31313232 h03
(b) In case of NAK response
Classification
Head Station no. Instruction
Instruction
type
Error code
(Hex 2 byte)
Tail
Frame Check
Frame NAK 10 R(r) SB 1132 ETX BCC
Hex h15 h3130 h52(72) h5342 h31313332 h03
(3) Meaning of each item
Classification Description
No. of data
▶
It means no. of byte of Hex type and it is converted into ASCII
▶
this number means number of byte.
Data type Available direct variable No. of data
Bit(X) %(P,M,L,K,F,T,C,I,Q,W,R)X 1
Byte(B) %(P,M,L,
,F,T,C,I,Q,W,R)B
1
Word(W) %(P,M,L,K,F,T,C,I,Q,W,R)W 2
Dword(D) %(P,M,L,K,F,T,C,I,Q,W,R)D 4
Lword(L) %(P,M,L,K,F,T,C,I,Q,W,R)L 8
Data
▶
There is ASCII conversion value of Hex data in the data area.
▷
Ex.1
If memory type of direct variable of request format is W(word) and no. of data is 03, no. of
data of PLC ACK response is h06 (2*03=06) and it is converted into ASCII code 3036.
▷
Ex. 2
If contents of 3 words data is 1234, 5678, 9ABC in order, ASCII code conversion value is
31323334 35363738 39414243. In addition, this value is included in the data area.