Re: [foxboro] FD30B problem
- From: Pablo Lioi <plioi@xxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Thu, 4 Mar 2010 11:24:28 +0000
Ali,
Thanks for your answer.
We are exchanging 16-bit integer registers.
The FDCVn parameters of the FDIIN blocks are all set to -32768.
In the other 5 cases, the configuration is exactly the same, and they are
working.
Pablo
> From: alizahidi@xxxxxxxxxxx
> To: foxboro@xxxxxxxxxxxxx
> Subject: Re: [foxboro] FD30B problem
> Date: Wed, 3 Mar 2010 22:30:43 +0000
>
> Pablo,
>
> As per my experience this scenario occurs when either the type of block
> doesn't match the data being recieved (e.g Integer block is used for
> displaying real value) or bytes swapping is not configured correctly.
>
>
>
> Rgds,
>
> Ali
>
> > From: plioi@xxxxxxxxxxx
> > To: foxboro@xxxxxxxxxxxxx
> > Subject: [foxboro] FD30B problem
> > Date: Wed, 3 Mar 2010 20:40:54 +0000
> >
> > Hi List,
> >
> > I am having a strange problem with a FD30B to FD30B communication.
> >
> >
> >
> > My system consists of 6 FD30B "onshore" processors communicating via
> > satellite link with 6 FD30B "offshore" processors (12 channels)
> >
> > At one "master" FD30B (onshore) I am getting all zero values at FDIIN
> > blocks (same for both ports), while on the "slave" FD30B (offshore), the
> > corresponding values are non-zero.
> >
> >
> >
> > Using a Modbus sniffer program on both ports of the "master" (onshore)
> > FD30B, I was able to determine that:
> >
> >
> >
> > 1-The onshore FD30B is polling the offshore FD30B in accordance with the
> > configured FDSCAN blocks.
> >
> > 2-The offshore FD30B is answering the polls in time and with non-zero
> > values.
> >
> > 3-There are no CRC errors and no retries.
> >
> >
> >
> > Looking at the PERF counters of ports 0 and 1 of the onshore FD30B in
> > Sysmon, I see that:
> >
> >
> >
> > 1-The number of transmitted messages matches the number of received
> > messages.
> >
> > 2-The timeouts, checksum and sequence error counters stay at zero.
> >
> >
> >
> > In short, the onshore FD30B is polling, the offshore FD30B is responding,
> > the onshore FD30B is accepting the responses, but values at the FDIIN
> > blocks remain in zero.
> >
> >
> >
> > The database is configured as follows:
> >
> >
> >
> > 1-There is a compound for each FDSCAN block
> >
> > 2-For each FDSCAN block there are 8 FDIIN blocks in the same compound,
> > reading (trying to read) 64 values from the FDSCAN.
> >
> >
> >
> > I have exactly the same configuration in the other 5 FD30B, and they are
> > working OK.
> >
> >
> >
> > I believe the problem must be in the FDSCAN to FDIIN interface, but I found
> > no error in the configuration of the FDIIN blocks.
> >
> >
> >
> > Of course, in a desperate attemp to solve things I:
> >
> >
> >
> > 1-Rebooted the onshore FD30B
> >
> > 2-Rebooted the offshore FD30B (yes, I know this had no logic)
> >
> > 3-Replaced the onshore FD30B (just in case)
> >
> > 4-Deleted/Undeleted a compound containing a FDSCAN block
> >
> > 5-Deleted a compound containing a FDSCAN block and re-wrote it from scratch.
> >
> >
> >
> > All to no effect.
> >
> >
> >
> > Any ideas?
> >
> >
> >
> > Regards
> >
> >
> >
> > Pablo Lioi
> >
> > TOTAL AUSTRAL S.A.
> >
> > Tierra del Fuego
> >
> > Argentina
> >
> >
> >
> >
> >
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> _______________________________________________________________________
> 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
>
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_________________________________________________________________
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_______________________________________________________________________
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Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
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