Re: Are you saying that all points in teh Inegrator 30 must run at the same
BPC? I can't have some at say 0.5 sec, and others at say 2 sec.?
Stan, don't confuse BPC with Block Period. The BPC (Basic Processing Cycle)
is fixed at system configuration for a particular station. It is the fastest
rate at which a block in that station is permitted to run. The Block Period
is a multiple of the BPC. The multiple is an integer value greater than or
equal to 1.
Various stations have different allowed BPCs. For example, the CP10's fasted
BPC was 0.5s (500ms) while the CP40 can support .05s (50 ms).
Regards,
Alex Johnson
The Foxboro Company
10707 Haddington
Houston, TX 77043
713.722.2859 (v)
713.722.2700 (sb)
713.932.0222 (f)
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
-----Original Message-----
From: Stan Brown [SMTP:[EMAIL PROTECTED]]
Sent: Wednesday, May 03, 2000 11:28 AM
To: [EMAIL PROTECTED]
Subject: Re: Integrator 30's vs. AB Stations
On Wed May 3 10:07:33 2000 Kevin FitzGerrell wrote...
>
>Stan,
>We are using 6 AB Stations rather than Integrator 30s at my plant.
I don't
>have a basis for comparison, but I can certainly tell you a little
about our
>AB Stations.
>
>The main reason to go with these for us was to keep setup fairly
simple --
>setup and continuing work on the stations is exactly like the same
work on
>CP30s. Response time is (can be anyway) faster as a result of only
having
>one network for a piece of information to negotiate (we are using
DH+ with
>our PLC5s, probably would have needed to go to ControlNet if we had
used
>Integrators).
Why do you say that? Number of connectors on the AB PLC's?
>
>Disadvantages are fairly serious with the AB Stations. You can't
have a
>redundant processor in your PLC when you have an AB Station in
place. You
>must adhere to the Foxboro's maximum data table size limitations
when
>setting up the PLC5s -- if any data table exceeds Foxboro's size
limits it
>will not read any of that table. You do not have the option of
having
>blocks being change driven -- every block evaluates every scheduled
cycle.
>This can result in limiting the number of blocks you can use on an
AB
>Station, or can result in needing to run the blocks at slower
periods with
>phasing implemented.
So you are saying on data table file in the PLC (at all not
just
communication files) can be larger than this maximim. What
is the
maximum? PLC5/s have an inherent maximum file size per DT
file of 1000
PLC words anywy.
Are you saying that all points in teh Inegrator 30 must run
at the same
BPC? I can't have some at say 0.5 sec, and others at say 2
sec.?
--
Stan Brown [EMAIL PROTECTED]
843-745-3154
Charleston SC.
--
Windows 98: n.
useless extension to a minor patch release for 32-bit
extensions and
a graphical shell for a 16-bit patch to an 8-bit operating
system
originally coded for a 4-bit microprocessor, written by a
2-bit
company that can't stand for 1 bit of competition.
-
(c) 2000 Stan Brown. Redistribution via the Microsoft Network is
prohibited.
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