Re: [foxboro] Alarms
- From: "Jones, Charles R. (Chuck)" <Chuck.Jones@xxxxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Tue, 17 Feb 2009 09:55:39 -0500
Last month, we had to deal with a very similar issue. Our alarm
messages were different. The primary indicator of a problem was that
user displays could not successfully view equipment from one particular
node.
Kevin gives great advice that I wish I would have had back then. The
only additional thing that we did that Kevin did not mention was to swap
cables around (copper and fiber) in an attempt to isolate the problem.
We did not realize then that we could have been contributing to the
problem.
We even replaced the P0960KA module (ours are not redundant).
Curiously, the hardware still indicated problems but the operator
screens began to work again...for about a week. In the end, I changed
the only thing I had not changed before. I bypassed a passive tap and
connected the P0969KA directly to the Copper to Fiber converter. All
the errors on the B cable cleared up. It looked so good, I did it on
the A cable too. The passive taps have a grounding strap on the
outside. We believe that either the passive tap had become part of a
ground loop or that it may have had a "noisy" ground caused by soft
start motor starters in the local vicinity.
Sincerely,
Chuck Jones
Automation Technologist
Tate & Lyle Lafayette Plant
On Tue, Feb 17, 2009 at 2:57 AM, <Ajit.S.Kumar@xxxxxxxxxxxxx> wrote:
> Hi,
> We have been getting failures on Carrierband lan Modules,P0960KA , One
> of the Primary Modules is taken offline with LED status as Red/green.
> Alarm messages are at random. Could anybody out there let me know what
> could be the possible cause of the messages.Is it related to Hardware
> fault. Note all elctrical connections were checked and tighted, Copper
> to Fibre Connectors were cleaned and secured. RG6 Drop cables and
> RG-11 Cables were checked. Fibre Optic Converter is OK too.
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