Re: [foxboro] system error in sequences
- From: dirk.pauwels@xxxxxxxxxx
- To: foxboro@xxxxxxxxxxxxx
- Date: Thu, 26 Aug 2010 09:41:02 +0200
Hi Doug,
Good idea! I'll start checking the P2P relations and build local copies
where needed.
Thanks & Rgds,
Dirk
"Douglas G. Lloyd" <doug@xxxxxxxxxxxxxxx>
Sent by: foxboro-bounce@xxxxxxxxxxxxx
25/08/2010 17:11
Please respond to
foxboro@xxxxxxxxxxxxx
To
<foxboro@xxxxxxxxxxxxx>
cc
Subject
Re: [foxboro] system error in sequences
Dirk,
A way to minimize the problem would be to build copies of this block
parameter for each external CP that requires access. Best case would be
to
build copies local to each CP to eliminate the one shot peer-to-peer
access.
Have all of the sequences in a particular CP read their own local copy.
This approach should eliminate the access collisions and also cut down on
network traffic.
Regards,
Doug Lloyd
DGL Controls
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On
Behalf Of dirk.pauwels@xxxxxxxxxx
Sent: Wednesday, August 25, 2010 10:28 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] system error in sequences
Hi Doug,
That could well be the case, this pressure xmttr is used by a lot of ind's
and calc's. In that case it'll be difficult to solve this probably, other
than extending the exception to sys-error or exception to manual I guess.
I'll do some more testing on it.
Thanks
Dirk
"Douglas G. Lloyd" <doug@xxxxxxxxxxxxxxx>
Sent by: foxboro-bounce@xxxxxxxxxxxxx
25/08/2010 15:30
Please respond to
foxboro@xxxxxxxxxxxxx
To
<foxboro@xxxxxxxxxxxxx>
cc
Subject
Re: [foxboro] system error in sequences
Here's another possible reason for the intermittent sequence errors: If
multiple sequences are trying to access the same parameter from different
CPs, they can collide every now and then and cause an access error. This
can happen with a read or a write, since even a read function appears to
temporarily "secure" the parameter. It's generally not a problem if
multiple sequences in the same CP access the same parameter since they
really can't execute simultaneously. But, no guarantees peer-to-peer.
Regards,
Doug Lloyd
DGL Controls
_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
foxboro mailing list: //www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
foxboro mailing list: //www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
Other related posts:
