[foxboro] In need of determining exactly why A Fieldbus is in trouble.


Good morning all,

I have a CP40(FT) that connects to a remote fieldbus via a set of Fibre
Optic Fieldbus Modems. Software Version 6.4. 

1) There are three drops to FBM Nests on the remote fieldbus.
2) The earthing is in accordance with Installation requirements.
3) All terminators are in place and as per installation requirements.
4) All modules are tightened and properly in place.

I have an "A" fieldbus that clocks up a large number of bad to good counters
(PIOEGB) per hour and a "B" fieldbus that clock up none whatsoever.

I cannot swap out FBM or FBM nests for testing, or even to isolate faults -
this is a plant that runs 24/7/365, except for short 2 days shutdowns every
3 months during which the system must remain available. I need to find the
problem on line.

All items that may be suspect for whatever reason, have been replaced, but
the error count rate on the "A" bus is unaffected by my efforts, and remains
very high. 

I am led to believe that one can check why these errors occur by using a
device/package called a "p-scope" - we do not have one.

Is anybody aware of a utility or methodology with which I can access or
"ping" each FBM in turn and check it's response and time to respond in the
same way a CP would do when it makes it's decision to fault a bus? 

Hope to hear from you soon,

Kind regards
Anton Prinsloo
Century Zinc 
Australia



 
 
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