Siemens Simatic S7-300 CP 341 User Manual page 195

Event class 8 (08H):
"Receive error"
Event no. Event
(08)02H 3964(R) only:
Error establishing connection:
In idle mode, one or more random characters
•
(other than NAK or STX) were received, or
After an STX was received, the partner sent
•
more characters without waiting for the
response DLE.
After partner power ON:
While partner is being switched on, the
•
CP receives an undefined character.
(08)05H 3964(R) only:
Logical error while receiving:
After DLE was received, a further random
character (other than DLE or ETX) was received.
(08)06H Character delay time (ZVZ) exceeded:
Two successive characters were not received
•
within the character delay time, or
3964(R) only:
1. character after sending of DLE while setting
•
up connection was not received within the
character delay time.
(08)08H 3964(R) only:
Error in block check character (BCC):
The value of the BCC calculated internally does
not match the BCC received by the partner when
the connection was terminated.
(08)0AH There is no free receive buffer available:
No receive buffer space available for receiving
data.
(08)0CH Transmission error:
A transmission error (parity error, stop bit error,
•
overflow error) was detected.
3964(R) only:
If a corrupted character is received in idle
•
mode, the error is reported immediately so that
disturbances on the transmission line can be
detected early.
RK 512 and 3964(R) only:
If this happens during send or receive
•
operations, repetition is started.
(08)0DH BREAK:
Break in receive line to partner.
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01
www.gkbpx.com
Remedy
Check for malfunction of the partner device, possibly
by using interface test device interconnected in the
data link.
Check whether the partner always duplicates the
DLE in the message frame header and data string or
the connection is released with DLE ETX. Check for
malfunction at partner device, possibly by using
interface test device switched into the transmission
line.
Partner device too slow or faulty. Prove this using an
interface test device interconnected in the data link.
Check whether the connection is seriously disrupted;
in this case you may also occasionally see error
codes. Check for malfunction of the partner device,
possibly by using interface test device
interconnected in the data link.
The FB P_RCV_RK must be called more frequently.
Disturbances on the data link cause message frame
repetitions, thus lowering user data throughput. The
risk of an undetected error increases. Change your
system setup or cable wiring.
Check the connecting cable of the communication
partners or check whether both devices have the
same setting for baud rate, parity and number of
stop bits.
Reconnect or switch on partner.
Diagnostics with the CP 341
8.1 Diagnostics Functions of the CP 341
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