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Event no.
Event
(08)01H
With 3964(R) only:
Expecting the first repetition:
An error was recognized on receiving a telegram
and the CP requested repetition from the partner
via a negative acknowledgment (NAK).
(08)02H
With 3964(R) only:
Error during connection setup:
In idle mode, one or more random codes (other
•
than NAK or STX) were received, or
after an STX was received, partner sent more
•
codes without waiting for response DLE.
After the partner has signaled POWER ON:
While partner is being activated, CP receives
•
an undefined code.
(08)05H
With 3964(R) only:
Logical error during receiving:
After DLE was received, a further random code
(other than DLE or ETX) was received.
(08)06H
Character delay time exceeded:
Two successive characters were not received
•
within character delay time, or
With 3964(R) only:
1. 1st character after sending of DLE during
•
connection setup was not received within
character delay time.
(08)07H
Impermissible message frame length:
A message frame of length 0 was received.
(08)08H
With 3964(R) only:
Error in block check character (BCC)
Internally calculated value of BCC does not match
BCC received by partner at end of connection.
(08)09H
With 3964(R) only:
Waiting time for block repetition has expired
(08)0AH
There is no free receive buffer available:
No empty receive buffer was available to receive
data.
Point-to-point connection CP 440 Installation and Parameter Assignment
Manual, 09/2007, A5E00057742-03
www.gkbpx.com
8.3 Diagnostics Messages of the Function Blocks
Event Class 8 (08H): "Receive error"
To correct or avoid errors
A repetition is not an error, however, it can be an
indication that there are disturbances on the
transmission line or a malfunction of the partner
device. If the message frame has still not been
transmitted after the maximum number of repetitions,
an error number describing the first error that
occurred is output.
Identify the malfunction on the partner device,
possibly by using an interface test device is switched
into the transmission line.
Check if partner DLE in message frame header and
in data string is always in duplicate or the connection
is released with DLE ETX. Identify the malfunction
on the partner device, possibly by using an interface
test device is switched into the transmission line.
Partner device faulty or too slow. Identify the
malfunction, possibly by using an interface test
device switched into the transmission line.
Receipt of a message frame of length 0 is not an
error.
Check why the communication partner is sending
message frames without user data.
Check whether connection is badly damaged; in this
case you may also occasionally see error codes.
Identify the malfunction on the partner device,
possibly by using an interface test device is switched
into the transmission line.
Configure the same block wait time in the
communication partner as for the CP 440. Identify
the malfunction in the communication partner,
possibly by using an interface test device switched
into the transmission line.
The RECV_440 FB must be called more frequently.
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Diagnostics with the CP 440
121
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