Posts Tagged honeywell udc

Using a Honeywell loop controller as a manual station

Industry statistics reveal that a fair percentage of control loops are controlled manually, and are not automated.   This fact was brought home last week, when a caller told us he needed “something to adjust the valve position so that the valve stays where it’s been set.  And it’s real important that it can’t accidentally go off its own”.   

What he was describing is what we call a manual station.   It’s a controller where the 4-20mA current output stays fixed where it is until someone pushes buttons on on the front of the controller: up to manually raise the output value, and down to manually lower it.  Typically, the output value is displayed for the operator as a digital number from 0 to 100 percent.  

So what’s available to fill the bill?
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Tested and proven: Honeywell PIE software reads and writes do not affect a UDC controller’s output

A customer has several UDC 3200 loop controllers with newly added Ethernet cards.   He needed to configure each of the controllers’ IP addresses using Honeywell Process Instrument Explorer (PIE) software.  Because the controllers are working in a 24×7 continuous process, he was concerned about how making those changes would affect each controller’s performance.

So he asked me:  Would a PIE action of uploading config files from or downloading them back to a controller affect the controller’s performance?

In the past, I’d only ever changed a controller’s IP address when it was on my workbench, not when it was actively controlling a process. So I’d never paid attention to whether PIE communications would affect the controller’s output or its PID action. Since I couldn’t answer the question, I told the customer I’d run a test to find out for sure.

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How do I tune a process control loop?

Industry surveys say that nearly half of all processes aren’t accurately tuned. If you read my post on accuracy, stability, and repeatability, you’ll know that a poorly tuned process can result in bad readings, downtime, and wasted materials.

If you use a Honeywell UDC2500, UDC3200, or UDC3500 1/4 DIN universal digital controller, there’s a great built-in function called Accutune that can help make sure your control process is properly tuned.

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