First off the cuff, the 1770-KF2 does have the capability to talk at
19.2. The AB Gateway 30 ABSCAN also has the capability to be set to
19.2. I have AB to Fox I/A talking at 19.2 with no problems.
The codes for the AB Gateway were not listed when I set this one up,
so I had to call TAC and get the correct number (can't remember it off
hand). This may be why it is not used very often.
Daren Bishop
Process Engineer
Ameripol Synpol Corp.
[EMAIL PROTECTED]
______________________________ Reply Separator _________________________________
Subject: Re: AB KF2 at 19.2 Kbaud?
Author: "Foxboro DCS Mail List" <[EMAIL PROTECTED]> at
INTERNET-MAIL
Date: 9/6/00 1:03 PM
>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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