Pneumatic Logic Control (Understanding PLC)

It's programmable logic control.

Google it for the basics, which you will need.

Or go to the site below.

How to Search the Internet Effectively

PNUEMATIC Pneumatic.

Or you could wait for CR4 member BIN95 to come along. Maybe send him an internal message... I am certain he would love to teach you all about PLC operation.

How do they get out, and get access to a PC?

Dunno...

I'm not that kind of doorman. I fix doors, not watch 'em.

While I agree that the OP more than likely meant "programmable" logic control, there are in fact...

Commercially available discreet pneumatic based logic elements that one can use to perform simple machine control.

Obviously these can not provide the higher level HMI functions that a PLC can provide, but it is possible to do as much with air as electrons when it comes to simple machine control.

I had a total pneumatic circuit that did just that.

And it is just discreet logic, they make module for just that now, can't remember the brand.

What I had done is contact our local pneumatic supplier and talk to an applications engineer (no not sales engineer) an applications engineer. He'll assist.

These gizmos were made by several manufacturers. Parker and Ingersol Rand come to mind. Here is a link...

Click Here

I hated working on them! Spaghetti everywhere.

Yes, spaghetti was it, and just a few weeks after, the application engineer said a company just came out with modular blocks, it would have really cleaned it up.

How about it, XAS35.

Will I be eating kroe?

THANKS LYN...i dont understand what ''kroe'' means.. by the way,, PLc.. seems to be difficult to understand really since, its a combination of four system then, electrical electronics, electrical and mechanical components.. i appreciate all the comments regarding the subject, because me i'm still digging on it..thanks

If you understand Electrical Controls it would not be hard to grasp pneumatic control.

In the attached link below there are some legends of valve on page 6-7. Go through them first before you plunge into any drawing. Hope it would be helpful

http://www.ascojoucomatic.com/images/site/upload/_en/pdf1/p1gb.pdf

THANK YOU SIR.. THE KNOWLEDGE I HAVE REGARDING ELECTRICAL IS JUST ABOUT LIGHTINGS FIXTURE ON THE BUILDINGS.. I THINK I HAVE TO DIVE MORE A COUPLE OF DEPTH IN THIS SUBJECT..

For micro pneumatic logic circuits, try these people. Computer controlled pneumatics.

http://www.clippard.com/store/

GREAT DETAIL.. THANKS

Bailey Controls (now owned by ABB) made a very extensive line of pneumatic logic controls. We still use some Bailey pneumatics for boiler and furnace control at a couple of power stations, but we're phasing them out because no one knows how to maintain them anymore. It takes a lot of patience with trial and error. Properly tuning a complete control system requires as much intuition as it does instrumentation.

Here's a manual for a fairly simple pneumatic ratio controller.

That is a complex mechanical method used to control a variable pressure depending on other variable pressures. I can understand the reason for the changes. Sensors combined with pneumatic "and" and "or" valves and some check valves would be able to replicate this function. Sensors feeding info to an electronic board would be even simpler. Thanks for posting that.