Re: [foxboro] FBM22 and A/M Station
- From: "Brown, Stanley" <stan.brown@xxxxxxxxxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Fri, 13 Mar 2015 15:51:20 +0000
We have used 762's for a similar application. Albeit the "normal" control is in
a PLC, but the 762 is the "fallback" control. Works like a charm, but as the OP
said, does use a bit of addition I/O.
-----Original Message-----
From: Stan Brown [mailto:stanb@xxxxxxxxx] On Behalf Of Gaylon F. Hicks
Sent: Friday, March 13, 2015 10:26 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] FBM22 and A/M Station
Hi Shaun,
In a past life we had about 50 of the FBM22 A/M stations on two units. As long
as the FBM22 is powered and functioning, the A/M station works. The CP can be
a melted puddle on the floor. The A/M station is nothing but buttons and an
indicator - all the logic to drive the output from the FBM22 is in the FBM22.
When we upgraded another unit at the same plant in 2005, the FBM22 was not an
option. What we did was install a "control station" that was just pushbuttons
and indicators, and built the logic in the CP to somewhat mimic the old A/M
station logic. This configuration requires the CP to be running. There is no
direct replacement for an FBM22, but this approach kept physical control
stations in place that Ops was familiar with, at the cost of a lot of I/O.
If you absolutely have to be able to survive a complete CP failure, you could
do something fancy like build tracking logic into another CP that would keep
its output slightly below the "controlling" CP (through a high select diode),
and configure your primary CP to fail its output low on a field bus failure and
let your backup CP take over. The drawback of this is that the more
complicated you make the redundancy/failover logic, the more likely it is going
to bite you in your tender spots when you least expect it. There is elegance
in simplicity.
Thanks,
Gaylon
===================================================
Gaylon F. Hicks
Engineered Solutions Inc.
gfhicks@xxxxxxxxxxxxxx
===================================================
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-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Goldie, Shaun S
Sent: Thursday, March 12, 2015 9:35 PM
To: 'foxboro@xxxxxxxxxxxxx'
Subject: [foxboro] FBM22 and A/M Station
Hi list this is an oldie and not a goodie,
Can anyone tell me the document that explains an FBM22 and Auto/Manual
station
Im after its fallback capability
Can the A/M station drive the output when the CP fails or does it require
the configured blocks to be running
This is all to justify chucking out desk controls as we are running out of
the A/M stations
Shaun
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