PID programming

tkswathik · Jan 20, 2006

Hi everybody,

i need help on PID loops and designing a ladder logic for the same.

The case is that i need to operate a valve positiion based on pressure on either side of the valve and also the flow through the valve.

can anyody help me in exp the procedure.

swathik.

balreddy · Jan 20, 2006

Hi Swathik
You can see the falowing link u can get some information related to PID loops.

by
Bal Reddy

balreddy · Jan 20, 2006

tkswathik said:
Hi everybody,

i need help on PID loops and designing a ladder logic for the same.

The case is that i need to operate a valve positiion based on pressure on either side of the valve and also the flow through the valve.

can anyody help me in exp the procedure.

swathik.

Hi,
Go to below link.
http://www.jashaw.com/pid/tutorial/index.html

By
Bal reddy

Tom Jenkins · Jan 20, 2006

Most PLCs ahve a built in PID function that you can call from ladder logic without writing your own.

On the physical side, I don't think you will be able to control both flow and pressure drop through a single valve. What is your system doing, and what is the objective?

tkswathik · Jan 21, 2006

hi bal,

thanks for the link and i could find some nice info.

please give ur mail id.
thanks,
swathik.

OkiePC · Jan 21, 2006

The case is that i need to operate a valve positiion based on pressure on either side of the valve and also the flow through the valve.

Maybe he meant he is measuring flow by comparing pressure signals on both sides of a valve?

He may need help with the calculations to convert these two pressure signals to flow. I've no experience here but isn't that possible with a consistent product?

If it is, he could then use PID just to control flow.

PID programming

tkswathik

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balreddy

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tkswathik

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OkiePC

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