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Communications Capabilities
Table 12-8 lists and explains the various error messages.
Table 12-8. Error Information in the Coordination Bytes
Contents
CBS
07
H
0D
H
11
H
13
H
CBR
01
H
03
H
05
H
07
H
09
*
H
0B
H
0F
H
1B
H
*
When CBR = 0 (e.g., receive is not possible because the PLC is in the "STOP" mode), up to 100 frames can be stored in
the receive buffer.
12.4.3 Mode
You can use mode numbers (1 to 8) to specify the type of data traffic. DW 7 in the ASCII parameter
set has a special meaning for each mode number.
A distinction is made between two types of protocol:
•
noninterpreting mode (mode numbers 1, 2, and 3)
No control characters are used in the send and receive modes.
•
interpreting mode (mode numbers 4 to 8)
An XON/XOFF protocol is used during data traffic. When the signal state of the "receive
permitted" bit changes, a signal is sent to the second interface:
-
XOFF for trailing edge
-
XON
for leading edge.
12-24
Description
Output buffer full
Parameter assignment error
No Send mailbox
Frame is too long
Character delay time exceeded
Parity error
Receive after XOFF
Receive buffer full
Too many frames received
Frame larger than receive mailbox
No Receive mailbox
Break
S5-115U Manual
Reaction
Data is rejected
Data is valid until time is
exceeded
Data is rejected
Data is valid,
subsequent frames are
rejected
Data is rejected
EWA 4NEB 811 6130-02b
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