Re: [foxboro] Determining Forces in PLB

On Wed, February 21, 2007 5:00 pm, David Johnson wrote:

> 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.

You ain't tellin' me nothing new! Almost all of our ladder logic
running FBMs are of the main/extended variety (it was such a great
idea at the time, 18 years ago), forcing us to touch every ladder in
converting them to 200-series FBMs. Hence it's another driving force
in doing away with ladder logic altogether. The thinking is, as long
as we have to edit the logic, we might as well port it to
logic/sequence blocks and modularize it for ease of maintenance in the
long run.

Duc



 
 
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