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Dear all,

We communicate 10 nodes through rs485 communication in v700 port 1..the problem is if my one divice is failture means other 9 nodes getting delayed..kindly provide solution 

 

RegArds

Mohamed 

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You will likely have a timeout and number of tries overlap error.  For any 485 comms you need to allow for the TOTAL time the plc may spend trying to contact a node, before you switch to the next attempt.  A simple example.... If you have a timeout of 1 second and 3 retries, then if there is an error on one node it will take a little over 3 seconds for the plc to ignore the error and reset the connection attempt ready for the next one.  Your interval/method of triggering the next call to any node must allow for this possibility.

To speed things up you often only do a single try, on the reasoning that if it fails once it will fail again.  

cheers, Aus

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