LSIS XGL-EFMTB - Page 143

Chapter 8 Dedicated Protocol Communication
8-3
(2) Basic Structure of Frame (Application Instruction Format)
1) Header
Company ID
(‘LSIS-
XGT’)
Rese
rved
(2)
PLC
information
area (2)
CPU
Info
(1)
H33
(1)
Invoke ID
(2)
Length
(2)
Reserved
area
(1)
BCC
(1)
** Figure in ( ) means the number of bytes.
▷ Company ID: ‘LSIS-XGT’ in ASCII text
▷ Reserved: area to match the character string number with LGIS-GLOFA
▷ PLC Info: Information area for PLC
▷ Invoke ID: ID used to discriminate the sequence among frames, which can be set
optionally at request instruction. And Response frame resends the
received Invoke ID at request instruction (an area used for checking for
errors in PC or MMI).
▷ Length: Length of the data area at the back of Header in the frame.
2) Data Request frame (external communication device → FEnet I/F module)
Header Instruction
Data
type
Reserved area
(2 bytes)
Structurized
data area
3) ACK Response frame (FEnet module → external communication device, if data is received
normally)
Header Instruction
Data
type
Reserved
area
(2 bytes)
Error status
(2 bytes h0000)
Structurized
data area
4) NAK Response frame (FEnet module → external communication device, if data is received
abnormally)
Header Instruction
Data
type
Reserved
area
(2 bytes)
Error status
(2 bytes:
Not h0000)
Error code
(1 byte)
Notes
1) If hexadecimal data is applied, the Hexadecimal type of data is indicated with ‘h or ‘h attached
in front of figures inside frame like 01, h12345, h34, h12 and h89AB.