[foxboro] Trapping calls

Hi List
 
I have a GDEV configured to control a valve.  
The AUTDSR parameter is not linked.
However, if I set AUTDSR to 1, (i.e. open the valve), 
something (a sequence perhaps) sets the AUTDSR to 0. (closes valve)
 
Is there a means of "trapping" this call so as to identify what is
closing this valve.
 
Thank you for your assistance.
 
Regards
 
Ashley Davey
African Products (Pty) Ltd
South Africa
 
Tel: +27 11 4585342.

 
 
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