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Response to Problems, Timeouts, and Errors
The processing unit monitors the following:
•
The time between the arrival of two acknowledgments from the DP master is
monitored for the timeout set in the Settings > Ports > DP > Timeout menu.
•
The correct order of the data packets acknowledged by the DP master is
monitored.
If an error occurs, the processing unit enters B#16#FF in byte 1 of the "Send" user
data interface and so aborts the current data transmission.
It is advisable to implement the following monitoring functions in the user program
of the DP master:
•
Monitoring of the time between arrival of two consecutive data packets.
•
Monitor the correct order of the data packets sent by the processing unit.
•
Check whether the total length of the user data actually transferred matches
the net total length of data to be transferred as specified by the processing unit
at the start of the data transfer.
If an error occurs, writing B#16#FF to byte 1 of the "Receive" user data interface
causes the current data transmission to be aborted.
Vision Sensor VS 130
A5E00199459-01
Controlling with a PLC
6-11
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