Capture and Average a Value with FFL, FFU, and AVE Instructions

In a previous article regarding ControlLogix processor faults, I mentioned one of the ways a processor can be faulted was by causing an array to go out of bounds when using an FFL and FFU instruction. These instructions are commonly...

ControlLogix Processor Faults

Years ago, I was in the middle of a normal day of work when I got a call on the radio that a conveyor had stopped, and then I was informed that the entire process around that conveyor had...

How to control an Altivar ATV320 VFD over Modbus with a Modicon M340 PLC

In this article I would like to show you how to control an ATV320 variable frequency drive using Modbus serial port on M340 PLC. Before we begin, following is the list of items you need PC with EcoStruxure Control Expert...

String Selection from Binary Input

Do you have a machine that you need to get data from? And do you need to send that data to another device but the machine lacks networking capabilities? In this article I'll show how to get data a your...

Converting PLC-5 Ladder Programs to ControlLogix

As I was entering kindergarten in 1986, Allen Bradley was releasing one of the first platforms that could be programmed by a personal computer, the PLC-5. Fast forward thirty-one years later to 2017, Allen Bradley discontinued support of these processors...

Using the Controller’s Time in Studio 5000

If the need arises to use specific time in your ladder logic program, this guide will give you a reference to go by. Possibly you have a cleaning device that only needs to operate once an hour or once a...

How to download RSLogix Micro Lite, RSLinx Lite, and Emulate 500 for free (2020)

UPDATE: As of April 2020 you now need to search on 1763 instead of RSLogix Micro Lite. Rockwell recently changed their website again, and as a result it's a little harder to find the free software downloads for use with...

Configuring A Modicon M340 PLC Ethernet Port

In this article I would like to show you how to configure an Ethernet port on Modicon M340 PLC and assign an IP address. Before we begin, following is the list of items you need PC with EcoStruxure Control Expert...

Bridging Networks Using RSLinx

If you are using Rockwell control systems as a platform across your facility or if you have integrated systems between other vendors along with any Rockwell products, you may have found the need to cross multiple networks to gain...

Siemens vs. Allen-Bradley PLCs: One Engineer's Perspective

Are you an experienced controls engineer working in manufacturing or integration with an in depth knowledge of Allen-Bradley and have recently been introduced to Siemens? For eleven years I've predominately with Allen-Bradley Programmable Controllers, which is not very surprising as...