Re: [foxboro] Determining Forces in PLB

David,  
        You are so right about that.  We just finished a 500+ I/O conversion 
from CP-30's and 60 to ZCP and 200 series IO and almost every discrete 
100 series FBM used an extended one and all were running ladder logic. 
We are doing another 600+ at midyear and have more to deal with.  We are 
eliminating as many ladders as possible then also.  It is a lot of work. 
  Luckily we are using Esscors FSIM + SIM4ME so we can configure and 
test all of our Control Configuration offline including the FBM 
emulation before we shutdown for the cutover.  That has been a godsend 
and insures that we haven't mis-configured anything.  The FSIM Virtual 
CP even emulates/executes the ladder logic.  We have a few instances 
where we actually need the speed that ladder logic provides, mostly to 
catch when field mounted momentary pushbuttons are used to shutdown or 
start equipment.
Tom

David Johnson wrote:
> Tom,
> 
> How I love PLB let me count the ways.....
> Another thing that is turning into a bit of a headache is migrating 
> 100 series ladders that are in 10/15, 10/13 or 8/15, 8/13 
> extenders.  Seems there's no 200 series equivalent to the extender 
> modules, so you have to re-write and re-path a fair amount of plb 
> ladder.  Although it seems straightforward, and in some cases it is, 
> it can be a real bear, and causes a lot of re-testing.
> 
> Regards,
> David
> 
> 
>  
>  
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