Today’s post is in answer to a question from Bruno on my last post on Faults and Messages. Bruno asks “If two faults happen at the same time, will this procedure work?” This is a more complex question than it …

Ladder Logic 403: Message Scrolling and Multiple Faults Read more »

Tagged with: , , , , , ,

Today’s post is extracted from my new “generic” PLC course manual, PLC Hardware and Programming – Multi-Platform. In the manual, I also cover the origins of the computer, beginning with the Babbage Analytical Engine, all the way back in 1823! …

Birth of the Programmable Controller Read more »

Tagged with: , , , , , , , , , , , ,

Today’s post covers ASCII, string manipulation and how to deal with readable text in a PLC. The picture above is from a ControlLogix program (Allen-Bradley, RSLogix5000 v.16) I wrote back in 2006. The program communicated with a PC-based Cognex machine …

Ladder Logic 305: ASCII and Strings Read more »

Tagged with: , , , , ,