Table of Contents
Advertisement
Communications Capabilities
Table 12-20. Error Codes in the "Coordination Byte for Receive"
Error Code
03
Parity error
H
05
Frame length is 0
H
07
Input buffer full
H
09
Too many frames received
H
(more than 100)
0B
Frame longer than Receive mailbox
H
DLE not transmitted twice in
0D
H
succession or no ETX after DLE
0F
No Receive mailbox
H
11
STX error: Handshaking did not
H
begin with STX
13
Character delay time ZVZ exceeded
H
15
Frame delay time BWZ exceeded
H
17
Checksum error
H
1B
Break
H
*
DLE and STX are control characters for connection buildup and connection cleardown (DLE=Data Link Escape,
ETC=End of Text). In order that the line procedure be able to distinguish a byte of data from a control character that
has the same code (DLE in this case), it automatically doubles the former.
DLE-ETX is a fixed sequence that is required for error-free connection cleardown.
**
STX is the control character that establishes a connection with the partner in the communications link (STX=Start of
Text).
Note
The location of the Send and Receive mailboxes (DB or flag area) must not be changed
as long as the "Send/Receive permitted" bits are set.
Note
The operating system can set or reset the bits in the coordination bytes after each
statement, without regard to the PLC cycle. This means that multiple scanning of a bit
in one of these bytes in a program cycle may produce different results (caution is called
for in conjunction with edge evaluation!).
12-52
Description
*
**
Priority
Reaction
5
Data rejected
6
2
2
Data valid, subsequent
frames were rejected
0
Data rejected
3
0
3
4
2
5
1
EWA 4NEB 811 6130-02b
S5-115U Manual
Advertisement
Table of Contents
