Re: [foxboro] alarm inhibiting vs. alarm disabling - process summary reporter

Based on my experimentation (because, as you pointed out, it's not in the 
manual), an block alarm will show up as "inhibited" when either [INHIB is 
on, the requisite bits in INHOPT are on, or the block's compound's CINHIB 
is on] AND [INHOPT for the block is either 0 or 2].  In other words, no 
alarm messages are generated (i.e., (no annunciation, appearance in alarm 
managers or logging to historians or printers), but alarms are still 
detected (the alarm flags are active). 


"Disabled" is the same except that INHOPT must be either 1 or 3, so not 
only are no alarm messages generated , but alarms are not detected - the 
alarm flags do not ever turn on (alarm flags include things like HAI, 
HHAIND, etc.).  Since interlocks are often (at my site, at least) 
triggered from these alarm flags, the difference between "disabled" and 
merely "inhibited" can be important.


Again, this is based on my observations only.  Maybe someone else can 
confirm/deny or give a better explanation.


Corey Clingo
BASF Corporation






Monte J Hansford <mjh20@xxxxxxxxxxxxxxxx> 
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Subject
[foxboro] alarm inhibiting vs. alarm disabling - process summary reporter






Hi, I'm a relatively new Foxboro user, and I'm trying to customize a
report of inhibited alarms using the Process Summary Reporter and a little
shell script.  I am a little confused about the difference between
'inhibiting' and 'disabling' alarms, which are two separate entries in
PSR.  'Alarms disabled' isn't described in the manual (B0193DG-E).
Am I right in thinking that 'disabling' refers to inhibiting alarms from
the block detail page, as opposed to inhibiting via the ICC?  When a
block's alarms are disabled, do they become 'inhibited' upon upload to the
workfile?

Monte J. Hansford
MeadWestvaco, Kraft Division
Process Control & IS Group

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