Programmable Controllers

Programmable Controllers

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Why the option to "hold last state" is important in control systems

There are some control system applications where system outputs must hold last state in the event they become physically disconnected from the controller, or if the controller stops controlling those outputs for any reason. These applications include some heating, cooling, and pumping applications where the...

What you need to know about CompactLogix and ControlLogix firmware, and how to get...

In today's article we'll discuss what you need to know about CompactLogix and ControlLogix firmware, as well as how to get it. Each Allen-Bradley Logix processor supports many different firmware revisions. And it's often the case that you'll load the newest firmware supported...
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Using the MicroLogix 1400′s LCD To Enable Default Comms

divider] The MicroLogix 1400's LCD display allows access to many of it's features and functions. In today's article, we show you how to use it to enable channel 0's default communication settings. NOTE: When "Default Comms" is enabled, the MicroLogix 1400's Channel...
AOI Parameters and Local Tags Viewable Columns

Why can't I access my AOI local tags from my HMI?

A client contacted me this week with a problem. He couldn't get his HMI to communicate to his ControlLogix AOI's local tags. However, what really seemed weird was that Rockwell HMI projects could do just this. So the question became, what trick was...
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Using the MicroLogix 1400′s LCD To Change Trim Pot Values

The MicroLogix 1400's LCD display allows access to many of it's features and functions. In today's article, we show you how to use it to change the Micro's Digital Trim Pot values: Changing Trim Pot values on the MicroLogix 1400 1) When the...

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