[foxboro] A Non I/A Query

  • From: Ajay.Tathgir@xxxxxxx
  • To: foxboro@xxxxxxxxxxxxx
  • Date: Wed, 25 Aug 2004 09:05:16 +0530

Is there a fundamental difference in the way which the OS of DCS & PLC's
process the user programs.

PLC's - What i think i know

- Scan the inputs, and write into Process Input Image
- Process, execute user programs
- Write down the outputs into Process Output Image

-----------Original Question----------------

Hi! All

I got a ludicrous question here folks. Though it has nothing to do with
I/A, but this forum has some of the best brains around to put the answer to
a query like this one, in right words.

- Today we all know that any PLC can do PID control, any DCS can do ladder,

- But still we all know that there are applications where we won't use DCS,
and there are applications where we won't use PLC.

Why ???

I will summarize...

Thanks & Regards

Ajay Tathgir

Reliance Industries Limited
Mumbai - India

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