[foxboro] ZCP270 spurious alarms - signals generation

From: akat cassandra <akat.cassandra@xxxxxxxxx>
To: foxboro@xxxxxxxxxxxxx
Date: Mon, 23 Feb 2009 12:06:48 +0200

Hi list,


Our application constitutes of an Invensys Foxboro DCS with the following
technical characteristics: Z-Module Control Processor 270 (ZCP270), FCM100Et
Redundant Fieldbus Communications Module, Mesh network configuration. For
that specific installation we have experienced the problems listed below:



   1. Spurious FCM fail/not fail system alarms and consequent FCM role
   switch have been reported.



   1. Random incorrect FBM I/O readings have been observed, mainly
   concerning digital input signals (module FBM217). Indeed, there were found
   some FBMs 217 that sometimes "loose" the contacts for 1 cycle (all contacts
   reported to be in "off" state). This happened not on regular basis and we
   could not detect any special process event that was related to this anomaly.




Seeking for a solution, we had thoroughly checked all interconnection cables
which are terminated at the cabinet where the spurious signals monitored as
well as the rest marshalling cabinets. Generally all these checks related to
field wiring connections as well as the power supply distribution were
generally satisfying. Therefore, we are almost convinced that the cause of
spurious signals generation was either a hardware problem or an erroneous
system configuration.



Have you ever experienced any related problem or a situation similar to the
one analyzed above?

If yes, what actions have been realized in order to eliminate the problem
and furthermore to ensure that it will not happen again?



Thank you in advance,



Theo


 
 
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[foxboro] ZCP270 spurious alarms - signals generation

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