Re: [foxboro] Alarm Management
- From: Terry Doucet <doucet427@xxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 14 Apr 2010 10:56:45 -0400
Billy,
INHOPT is non-connectable and non-settable so only a configuator or config tool
can modify this parameter.
INHIB is connectable and settable
INHALM is connectable and settable
You can see a detail display (Foxboro standard display) for the AIN block -
Alarms where you can see the difference between the INHIB and the INHALM
parameters but basically INHIB suppresses all alarm message while INHALM is a
packed boolean where you specify a pattern that can selectively supppress the
messages from some or all of the various alarms in the block. Only one
parameter needs to be TRUE to inhibit messages but both must be FALSE to get an
alarm message.
I believe that there are Invensys and third party applications that will
suppress alarm messages based on specific input conditions. So if a pump is to
be taken out of service and you can expect 20 alarms while that pump is gone,
you can set up the program to suppress these 20 messages perhaps based on
Operator (Maintenance) input or zero flow switch (for example). The logic
itself will take a large amount of work to determine and usually must pass
through a Management of Change committee so that the process safety can be
assurred.
Programms that I worked on write (hex) to the INHALM parameter. Maintenance
staff who had access to the Foxboro detail display used the INHIB parameter
whenever they needed to suppress alarms while they worked on transmitters, etc.
Run some internet searchs on Alarm Management to see options.
Terry
> Hi List: I'm wondering if there is a tool or script that can be used to
> modify the INHOPT parameter (to 2, Disable Alarm message plus Auto
> acknowledgement ) and the INHIB parameter (to 1) on a given block.
> Thanks!
> Billy
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