Re: [foxboro] Determining Forces in PLB
- From: <tom.vandewater@xxxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 21 Feb 2007 14:54:22 -0500
David,
Yes! That would be nice. I hope someone else has the answer.
There has to be a bit or integer in the memory of the FBM that is set
because the PLB Monitor displays a differentiating color, red, when a
contact is actively forced on and a different color, blue, when forced
off. I wonder if the force info is also stored somewhere in the host
filesystem?
The only ICC ladder file I am aware of is on the CP host stored
in:
/opt/fox/ciocfg/PLBs_CMPD_Name/PLBs_Blockname.p We are also interested
in accessing current timer or counter values that are running in the PLB
ladder if anyone knows how.
As an aside, even though the ladder logic is continuously
executed in a 3-5 ms scan, we are migrating away from running it because
of the many issues such as this that have continually plagued us with
PLB's since we started using them in 1989. The latest in a long line is
that FBM's running ladder logic on a loaded CP-60 fieldbus can
repetitively cause System Alarms such as the following:
02-21-07 10:43:33 0 SYSMON =3D SYS21A 21CP05 Equip =3D 140304
SYSMON -00069 Single PIO Bus Access Error on B
02-21-07 10:44:23 0 SYSMON =3D SYS21A 21CP05 Equip =3D 140304
SYSMON -00071 Single PIO Bus Access Recovery on B
We have already reconfigured a lot of our ECB8/Software Type 8,
(Ladder Logic), FBM's to be ECB5/Software Type 5, (CIN/COUT), compatible
and use dedicated CIN and COUT blocks for each IO point instead of the
ladder embedded CIN/CO's. More blocks, slower scan, but more reliable
and document able.
Cheers,
Tom V.
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of David Johnson
Sent: Wednesday, February 21, 2007 2:03 PM
To: Foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Determining Forces in PLB
Hi List,
Is there a way to get a force list for a PLB without having to look=20
at each line and visually determine if anything is forced? We'd like=20
to be able to generate a report of PLB forces (the actual item that=20
is forced, and if it is forced high or low), but I have no idea how=20
you would do that.
Thanks,
David
=20
=20
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