Re: [foxboro] FD30B problem - SOLVED
- From: Pablo Lioi <plioi@xxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Fri, 5 Mar 2010 00:20:18 +0000
Barry,
In fact I did check, and the data coming from the slave is OK.
The problem has already been solved, thanks to Andy Goss' posts.
The problem was in the FDIDMS blocks configuration (the ones that process the
slave responses), where one parameter, corresponding to the modbus function
code, was set to 0 intead of 3.
I posted my reply earlier, but for some reason it didn't show up in the thread.
Regards,
Pablo
> From: BHeap@xxxxxxxxxxxxxx
> To: foxboro@xxxxxxxxxxxxx
> Date: Fri, 5 Mar 2010 10:22:20 +1100
> Subject: Re: [foxboro] FD30B problem
>
> Hi Pablo,
>
> Here is a really dumb suggestion ...
>
> You say the Master is Polling and the Slave is responding ...
>
> Have you checked what is actually coming from the slave (with a Modbus
> sniffer)?
>
> It is possible that what is being returned at each poll is an error message,
> rather than a data response ...
>
> Regards,
>
> Barry Heap
> Project & Shutdown Manager
>
> Direct: 03 9855 4057
> Mobile: 0421 333 407
> Fax: 03 9853 3734
>
> Email: bheap@xxxxxxxxxxxx
>
>
>
> -----Original Message-----
> From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
> Behalf Of Pablo Lioi
> Sent: Thursday, March 04, 2010 7:41 AM
> To: foxboro@xxxxxxxxxxxxx
> Subject: [foxboro] FD30B problem
>
> 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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> 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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your own risks. Read http://www.thecassandraproject.org/disclaimer.html
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