Re: [foxboro] R: DNBI Cabling for long Distance

Just a note to mention that we have a mixed V7.1.X/V6.5.X primarily Unix
system based system, and we are not currently noticing delay issues.
However, in the back of my mind, it seems I remember that I might have
noticed some delay a year ago.  Foxwatch was in a few times to address some
alarm reporting issues between a couple of V7.1 AW70 OPC I/O Gate stations
and the V6.5.X 51B operator stations, and they might have cleared up some
of the delay issues.  One of the problems they discovered was that the NFD
process was not disabled on the V6.5.X AWs - which is a requirement when
connected to V7.1 AWs.

I should mention that be especially careful if you rcp files from a 51G
(and probably a 51F) to multiple V6.5.X 51Bs and 51Ds across the V7.1
switch and NCNIs to the Nodebus, you will likely cause Nodebus
errors/system alarm messages, or at its worst and if the file is big, you
will throw the Nodebus for a loop causing smurfing of your Nodebus
stations.  And yes, we found out bad it can get the hard way, while
transferring a tar file of DMC Bridge display files around to the stations.
If this happens to you, be sure to run the Nodebus cable test to get your
station communication problem resolved.  Initiating the transfer of the
same file from an AW51D station does not cause any noticeable problem.  My
guess is that the V7.1 stations worsen the problem for the slower Nodebus
due to their faster processors and 100 megabit ethernet connection.  I know
that transfer of files across the Nodebus has never been recommended and
that this has always been the potential problem, but when you don't have
all your AWs and WPs connected via the 2nd ethernet port, there is little
good choice.

Our current system consists of  four V6.5.X Nodebus segments with 14 pr. of
FTCP40A, 1pr. FT CP40B, 10 WP51Bs, 1 AW51D, 1 AB Gateway   and about 7
Modbus Gateways being connected via 4 sets of NCNIs to an A & B channel
pair of V7.1 ethernet switches along with V7.1 stations consisting of 1
AW51F, 1AW51G, and 2 AW70 OPC I/O Gate stations.  Most of the V6.5.X CPs
and Gateways, and 1 WP51B are split across 3 of the Nodebus segments, while
the 4th Nodebus segment consists 1 AW51D, 9 WP51B, 1 AB Gateway, COMM
Processors, 1 FT pr. of CP40B.


Neil Martin,    P.E.
Huntsman Polymers Corporation
2505 South Grandview
Odessa, TX.  79766
ph) 432-640-8436
pager)432-742-4289
email page)4327424289@xxxxxxxxxxxxx


                                                                           
             "Schouten, Frits                                              
             JF"                                                           
             <Frits.Schouten@b                                          To 
             luescopesteel.com         <foxboro@xxxxxxxxxxxxx>             
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             Sent by:                                                      
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             eelists.org               Re: [foxboro] R: DNBI Cabling for   
                                       long Distance                       
                                                                           
             07/26/2006 04:47                                              
             PM                                                            
                                                                           
                                                                           
             Please respond to                                             
             foxboro@freelists                                             
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A very known problem.
Try telnetting from your AW to a WP on the switched network (V7.x).=20
That's near impossible.
I don't think it has anything to do with the cable length.=20
Looks to me more like a switch problem. It just looses the path or so.
I have great issues between CP's and the AW trying to utilise SENDMSG to
execute programs on the host and then to get some data back to the CP.
This fails on a regular basis.

Cheers,
Frits Schouten
NZSteel.


-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Kevin FitzGerrell
Sent: Thursday, 27 July 2006 9:16 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] R: DNBI Cabling for long Distance

Jaime,

It's my understanding that this is a known issue.  We see the same
behavior when using rlogin to a V7.1.1 workstation - we have short UTP
cables (2 meters) and experience these problems. =20

Regards,

Kevin FitzGerrell
+64 27 460 9994

Quoting "Jaime Claramunt R. (Inforsa)" <jclaramunt@xxxxxxxxxxxxxxx>:

> what about distance between RCNI and AW ? UTP cable side , I mean.
> We are suspecting of collitions or some other problem making very slow

> =3D comms with other nodes. Maybe we exceed this distance.
> For instance, opening ICC from other AW or try to edit sequences, is =3D

> very slow... much slower than before the upgrade to 7.1.1 (just for=20
> this node AW other 3 ones are OK)
>=20
>=20
> Jaime Claramunt
> Depto.Ing.Planta
> INFORSA
> 43-631576
>=20
>=20
>=20
>=20
> -----Mensaje original-----
> De: foxboro-bounce@xxxxxxxxxxxxx
> [mailto:foxboro-bounce@xxxxxxxxxxxxx]En
> nombre de Corey R Clingo
> Enviado el: Martes, 25 de Julio de 2006 16:20
> Para: foxboro@xxxxxxxxxxxxx
> Asunto: Re: [foxboro] R: DNBI Cabling for long Distance
>=20
>=20
> Yes, it worked much better for us.
>=20
> Corey Clingo
> BASF Corporation
>=20
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> "BrianLong" <blong@xxxxxxx>=3D20
> Sent by: foxboro-bounce@xxxxxxxxxxxxx
> 07/25/2006 11:51 AM
> Please respond to
> foxboro@xxxxxxxxxxxxx
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> To
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> Subjec t
> Re: [foxboro] R: DNBI Cabling for long Distance
>=20
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> To summarize is it correct to say, don't use DNBX, use NCNI's with a =3D

> rack and a DNBI?
>=20
> Brian Long
> Arkansas Kraft
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> DCS Administrator
> Tele +9663577-5396
> Pager +9663870-1474
> eFax +96638744444 / Ext. 133732
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