Siemens SIMATIC CP 340 User Manual page 138

Diagnostics with the CP 340
8.2 Diagnostics Messages of the Function Blocks P_SEND, P_RCV and P_PRINT
Event no. Event
(08)01H Only for 3964(R):
Expectation of the first repetition:
An error was detected on receiving a telegram and
the CP requested repetition from the partner via a
negative acknowledgment (NAK).
(08)02H Only for 3964(R):
Error establishing connection:
In idle mode, one or more random codes (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 Only for 3964(R):
Logical error while receiving:
After DLE was received, a further random code
(other than DLE or ETX) was received.
(08)06H Character delay time (ZVZ) exceeded:
Two successive characters were not received

within character delay time, or
Only for 3964(R):
1. character after sending of DLE while

establishing connection was not received within
the character delay time.
(08)07H Illegal telegram length:
A zero-length telegram has been received.
(08)08H Only for 3964(R):
Error in block check character (BCC):
The value of BCC calculated internally does not
match the BCC received by the partner when the
connection was terminated.
(08)09H Only for 3964(R):
The number of repetitions must the set to the same
value.
138
Event class 8 (08H):
"Receive error"
To correct or avoid errors
A repetition is not an error, but it can indicate that
there is interference on the data link or the partner
device has malfunctioned. If the telegram still has
not been transmitted after the maximum number of
repetitions, an error number is output that describes
the first error that occurred.
Check for malfunction of the partner device; you may
need to use an interface test device (FOXPG)
interconnected in the data link.
Check whether the partner always duplicates the
DLE in the telegram header and data string or the
connection is terminated with DLE ETX. Check for
malfunction of the partner device; you may need to
use an interface test device (FOXPG) interconnected
in the data link.
Partner device too slow or faulty. Check this using
an interface test device (FOXPG) interconnected in
the data link.
Receipt of a zero-length telegram is not an error.
Check why the communication partner is sending
telegrams without user data.
Check whether the connection is seriously disrupted;
in this case you may also occasionally see error
codes. Check for malfunction of the partner device;
you may need to use an interface test device
(FOXPG) interconnected in the data link.
Assign parameters to the same block wait time at
communications partner as at CP 340. Check for
malfunction of the communication partner; you may
need to use an interface test device (FOXPG)
interconnected in the data link.
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03