LAUER PCS 091, Руководство пользователя

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© Systeme Lauer GmbH AEG250PX-Expander driver
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D
D3.6 Communication error
During PCS - programmable controller communication, the PCS operates as master
and the programmable controller as slave. Thus, it is the task of the PCS to set up
and monitor communication. Thereby, the correct communication is monitored
between the programmable controller and the PCS. The following error message
is provided for this purpose:
======== COMMUNICATION ERROR ============
TIMEOUT
In both, in the PCS and in the programmable controller there is a time monitoring
function for the serial data exchange and sync. word processing. In the PCS, the
time-out time totals 4 seconds as default value. After that an error message is
displayed in the PCS and the error LED flashes. The PCS tries again to establish
the communication in the background. If this is successful and word 3 is processed,
then the above shown error message is erased. Example: Interruption of the adapter
cables.
The data interchange is performed in data blocks and each block is examined for
length, content and block check. If a fault is discovered, then the block is requested
once more. With more repetitions in a sequence, the communication is interrupted
and the above shown error message appears.
======== COMMUNICATION ERROR ============
Timeout programmable controller
The status of the programmable controller is scanned during establishing the
communication. Thus, the PCS can ascertain whether the programmable controller
is in RUN mode. If the programmable controller in the STOP mode then the above-
mentioned message appears. If the programmable controller is switched into RUN
mode then the message is erased and the communication is resumed.
Communication