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Rosemount 485

First off  I am new to this.

 

I have (6) radars on different tanks.  At the PLC I can connect to any 3 in any configuration I want and get radarmaster program to communicate.  If I land any 4th radar I can not communicate with  any of the radars.  I have tried swapping out any configuration of tanks and its always the same I can get  the first 3 but as soon as I go with 4 it won't communicate.

 

This system has been installed for 4-5 years and  I was told it had been working. Few months ago it was  found no longer working.

 

Rosemount has had me  track all the shields and  isolate them  at the  PLC but I still have the same  issue.

 

 

Any Ideas?

 

Corey.

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What NI software/hardware are you using? How are you communicating with the PLCs?

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