Hi list,
I looking for detailed information about how the node bus on I/A Foxboro DCS
works.
Recently we had have problems with a nodebus extended redundant (250 meters
length), the internal node bus contact inside the enclosures (slots
conectors) and conection between the enclosures too.
We solve the problems with a simple cleaning and changing a cable RG-58 (of
ten years old) by a new RG-8 for the nodebus extension for channel B, the
channel A remains with a RG-8 in good conditions. But remains a problem
with the DNBI that conects the AW51B (the system´s host) to node bus that
reports RA problem.
We change the DNBI and the system monitor was relaxed ;-). The alarms not
appear more.
But I wonder why is so important a RA failure only for a DNBI station that
compromises the entire system.
How the system use the node bus to guarantee redundancy? It is possible
that our configuration have some problems?
Thank you very much for your help, information and experiencies.
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