Re: [foxboro] FBM231 modbus with siemens; problem solved!

The FBM231 did not receive the feedback from the Siemens PLC within the
(default) time-out (250 ms @ 19K2).

However, I was convinced that I had changed the time-out value to 2 seconds!

This was what I entered in the FDSI configurator:

MODBUS/ASCII+@20+H+T0=20

This is what it should be:

MODBUS/ASCII+@20+H+TO=20

Quite embarrassing actually, considering the local Foxboro help-desk (Baarn)
had to point this out to me (thanks!)

If you would look it up in the manual B0700BG_C, page 13 you would find that
with the character-set used in the manual a 0 and O are identical
characters.

Of course it's Time-Out and not Time-0ut but that is only obvious ones
you've solved the problem!

I've noticed sometime ago that the letterbug configurator (PDA)
automatically replaces a O(ooo) with a 0 (zero) when entering the O(oooo),
which means that problems like these are anticipated, which is very good!

It would be nice for the FDSI configurator to do a syntax check on the
entered configuration string, specially because this can become quite a
cryptic sequence of characters.


Anyhow, the Modbus link is working fine now !

Regards,

Patrick Martens
Total Raff. Ned. N.V.


-----Oorspronkelijk bericht-----
Van: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
Namens FoxPat
Verzonden: donderdag 18 oktober 2007 19:14
Aan: foxboro@xxxxxxxxxxxxx
Onderwerp: [foxboro] FBM231 modbus with siemens

Dear list,
 

We're having some problems with a new modbus link.

 

FBM231, modbus driver version 1.1, scan-rate 0.5 seconds.

 

Reading coils and registers is no problem.

 

Writing coils works but after a certain amount of writes (just toggle of 1
BOUT) the complete link starts to fail intermittently (works for a few
seconds and then all smurfed for a few seconds, works again for a few
seconds, smurfs .. Etc).

 

Only a reset of the Siemens communication card (pull-push, there's no reset
button) solves the problem, but after several write attempts fails again.

 

 

Installed all the DCI IIN blocks for FBM port and device counters (as
described in the manual) but these don't help me much other then indicate
there are no CRC or framing errors. Scan time is only about 100 mSec. 

 

I hope to install a modbus analyser tomorrow to see what is actually
happening.

 

Anybody had similar problems?

Any suggestions ?

 

 

Kind regards,

 

Patrick Martens

Total Refinery Nederlands. N.V.

 



 
 
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