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Diagnostics and error behavior
Diagnostics via FB STATUS
Event class 07h "Send error"
Event class / number Description
07 06h
07 07h
07 08h
07 09h
07 0Ah
Event class 08h "Receive error"
Event class / number Description
08 01h
08 02h
96
With 3964(R) only
Error at end of connection:
n
Partner rejected message frame at end of connection with NAK or a random string (except
for DLE).
Acknowledgment code (DLE) received to early.
n
Remedy: Check whether the partner is also showing an error, possible because not all trans-
mission data has arrived (e.g. due to break on line) or due to serious faults or because the
partner device has malfunctioned. If necessary, use an interface test device switched into the
transmission line for this purpose.
With 3964(R) only
Acknowledgment delay time exceeded at end of connection or response monitoring time
exceeded after send message frame.
After connection release with DLE ETX no response received from partner within acknowledg-
ment delay time.
Remedy: Partner device faulty or too slow. If necessary, use an interface test device switched
into the transmission line to check.
With ASCII driver only
The waiting time for XON respectively CTS = ON has elapsed.
Remedy: The communication partner has a fault, is too slow or is switched off-line. Check the
communication partner or, if necessary, change the parameterization.
Connection setup not possible. Number of permitted setup attempts exceeded.
Remedy: Check the interface cable or the transmission parameters. Also check that receive
function between CPU and CP is correctly parameterized at the partner device.
The data could not be transmitted. The permitted number of transfer attempts was exceeded.
Remedy: Check the interface cable or the transmission parameters.
Expectation of the first repetition:
An error was detected on receipt of a message frame, and the CP requests a repetition by
means of negative acknowledgment (NAK) at the partner.
Remedy: A repetition is not an error, but it can be an indication that there are disturbances on
the transmission line or that the partner device is behaving incorrectly. If the message frame still
has not been transmitted after the maximum number of repetitions, an error number describing
the first error that occurred is output.
With 3964(R) only
Error during connection setup:
In idle mode, one or more random codes (other than NAK or STX) were received.
n
n
After a STX was received, partner sent more codes without waiting for response DLE.
After the partner has signaled PowerON:
n
While partner is being activated, CP receives an undefined code.
Remedy: Check for malfunction at partner device, possible by using interface test device
switched into the transmission line.
VIPA System 300S
HB130 | CP | 341-1CH01 | en | 18-40
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