This confused me more than helped to clear things up. If the
following is true.
"The 1770-KF2 does NOT have an option for communicating at 19.2K"
Does this mean the 19.2K dip switch setting is not really
available? The SW6 settings shown on the KF2 cover include 19.2K.
We have contemplated running at 19.2K, but haven't because of our
current cable lengths are well over the 20 foot maximum recommended
length.
Jim Murphy
Eli Lilly and Company
Kirk D Carver <[EMAIL PROTECTED]> on 09/06/2000 01:03:37 PM
Please respond to Foxboro DCS Mail List
<[EMAIL PROTECTED]>
To: Foxboro DCS Mail List <[EMAIL PROTECTED]>
cc:
Subject: Re: AB KF2 at 19.2 Kbaud?
>From our in house AB guru:
" I do not know of a situation in which it wouldn't work at 19.2K, but the
bandwidth requirement is small: the bottleneck is the GP, not the DF1 line.
If
he's actually getting real empirical results back showing a huge ==x2
improvement when moving the DF1 connection from 9600 to 19.2K, then I'd be
both
surprised and suspecting his ABSCAN and compound configuration. "
....and from our local rep:
" First, let's clear up any potential confusion.
1770-KF2 - Stand alone box w/ 120VAC power (from outlet) that converts DH+
messages to RS-232C DF1 messages for communicating with the Foxboro.
1785-KE - PLC "slide-in" module that does the exact same thing. (It fits
in
a 1771 I/O chassis).
The 1770-KF2 does NOT have an option for communicating at 19.2K
The 1785-KE DOES let you go 19.2K.
Other than that, they are the same beast.
The only (potential) draw back to going to 19.2K baud on a 1785-KE module
is
the baud rate is less noise resistant.
It does work, though, and I have little or no problems with it handling
that
(blazing?!?!) speed! You shouldn't see any problems in your installations,
since you guy's typically use well shielded cable for your serial
interfaces.
Kirk, I know you have a lot of "KE" modules out there, but I do think you
are using some KF2 modules also, although I don't know where. The Foxboro,
or any DCS, can not tell the difference between the two, since they're are
basically the same thing, only in a different housing."
____________________
Kirk Carver
ExxonMobil Chemical
Beaumont Polyethylene Plant
PO Box 2295
Beaumont, Texas 77704
Phone: 409-860-1314
[EMAIL PROTECTED]
-----------------------------------------
David Johnson <[EMAIL PROTECTED]> on 09/06/2000 09:32:08 AM
Please respond to "Foxboro DCS Mail List"
<[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
cc: (bcc: Kirk D Carver/Beaumont/Mobil-Notes)
Subject: AB KF2 at 19.2 Kbaud?
I have noticed that most of the Allen-Bradley KF2 modules I come across in
the field are running at 9600 baud. I also know of some instances where a
Foxboro Integrator 30 is communicating with AB KF2s at 19.2 Kbaud. Is
there any reason not to run the baud rate at 19.2K? You sure get a lot more
I/O throughput that way.
Regards,
David
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