Re: [foxboro] CP Loading
- From: "William C. Ricker" <wcricker@xxxxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Thu, 6 Jan 2005 18:20:43 -0500
>Does anyone have a good rule of thumb to check CP loading without spending
>lots of time.
The Idle Time stuff on the Station display is all connectable Block
parameters. For example, for CP 06CP01 the idle time itself is:
06CP01_STA:STATION.IDLETM
and it is a Real value. If it were shoved into the MEAS on an AIN which
has the IOMOPT set to 2 (simulate) you could apply a filter giving you
the aproximation of a rolling average, then have the historian collect
it over time. Presto, an idle time history.
If you wished, this, and idle time values from all your CPs could be
collected on a single display back in the instrument shop to overview the
whole system.
Other values might also be of interest. Any of these which are displayed
can be easily identified by using "Select Point" (SYS menu pick) to gett
the C:B.P address. They are listed in the documentation somewhere, but
I don't remember where.
There are also some error counters like "FBM comm errors which were resolved
on retry" which sit in other parameters of the station block (I don't
remember
the param names). Stuff like these can show impending failures in things
like FBMs before they go hard.
If you are looking for the suggested maximum loading on CPs and INTs of the
various models, that info is in the books somewhere; again I don't remember
where. (Maybe someone else has these numbers off the top of his head ??)
Regards,
William C. Ricker
FeedForward, Inc.
Marietta, GA USA
770.426.4422
wcricker @ feedforward.com
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