I was wondering if any of you control experts have ever taken a step back and look to produce any forms of data models (conceptual/logical etc) for instrumentation/control etc?

As a newbie I was hoping to find something that gave a good conceptual overview of the "data" entities involved in control and how they all relate. I do have some knowledge of the Plant/PU/Equipment/Instrument hierarchy, even some of the entities involved in control: open/closed loop, process variables, process functions, final elements...but what I am interested in is the data and not neccesarily the phyical elements themselves.

Currently scouring ISA, ISO etc standards for something useful but looks like I am going to have to do a lot of research to get this accurate - unless someone already has something similar? Same goes for process data, I was hoping to find some conceptual models of this too.

Sorry to post something so basic to you experienced engineers but I need to start somewhere!

 

Hi there,

I find your post very difficult and confusing and cannot understand what it is you need. One moment it seems you want very complex and involved information and then you seems to want to learn all the basics about instrumentation and control concepts. I am sure a lot of us can and are willing to help but we need to understand what it is you want. Ask simple and straight forward questions and leave out the “High English” and nice wording like entities, data, models and stuff like that.

Keep in mind that not all who read or answer on this forum’s home language is English.

A Examples of a straight forward question can be:
How do we measure various process levels, temperature, pressure and what instruments do we use, how do we know what instruments to use where, what is the different types of signals that we use, how do we control a process like level or pressure, how does PLC or SCADA programming interact with hardware in the field.

You seems to be more interested in data. What data are you referring to. We have signals in various forms that can be called data, we have software that can be called data and various others that can be called data. What do you need to know?

If you feel unsure how to ask, start at the bottom and ask simple questions and as you receive answers start asking more involved questions until you have what you need.

 

The high level view and datamodeling you are looking for should be available in ISA S88 and ISA S95.

Kind regards,
David

 

I think David has understood the pulse of the newbie.

The way the question was asked, i am forced to think that they guy is having a IT background wanting to work on the MES systems - how data gets integrated from the level 0 to the level 4. I hope David would agree with me. The guy is asking about the models - related to batch processing (unit operations, equipments, their relationships - shared / unique, parent & child assets etc).

If i am not wrong, please let me know if you are looking in the same direction. I would be able to help you.