Appendix 1 Definition of Terms
A-7
(15) Frame
Frame is composed of transmitted and received data as in a specified form in data communication
including additional information of segments [station No., command, parameter by command], control
characters [ENQ, ACK, EOT, ETX] for synchronization, parity for detecting error, and BCC. The
structure of frame used for serial communication of Cnet is as follows.
Head Tail
E
N
Q
E
O
T
Station
No.
Parameter by Commend
B
C
C
Segment
A
C
K
Request Frame
Res
onse Frame
E
T
X
B
C
C
Head
Segment Tail
Comm
and
Station
No.
Comm
and
Proces
sing
Result
[Structure of general Tx/Rx frame]
- Head: ASCII value indicating frame start.
- Tail: ASCII value indicating frame end.
- BCC (Block Check Character)
Check data for Tx/Rx frame
Used to inspect reliability of data with such various methods as ADD, OR, Exclusive OR,
MULTPLY, etc
(16) Reset
This function is used to initialize the communication module with errors.
Use XG-PD to select [On-Line] → [Reset] so to execute Reset, which will restart PLC.
To Next Page
Loading...
Need help?
General
