Thursday, 14 February 2008

On ISA Part 5

The ISA part 5 developments appear to me to be trying to take Part 1 concepts into areas it was never designed for, such as the inside of machines.
In the process of doing this they are inventing new meanings for those Part 1 concepts such as Control Recipe and Procedural Control. This will only confuse, especially the use of terms like Operation and Unit Procedure. They think that an Equipment prefix means that they are not the same thing. I cannot find anywhere in Part 1 that says that - the Equipment prefix adds the ability to direct basic control, but does not remove the Recipe meanings.

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