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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