Simple Ladder Pulse
This morning I had someone send a ladder diagram on a dry-erase board with an attempt at creating a 10 second pulse to dispense something. It was much more complex than it needed to be and I tried to explain …
Category: PLCs
Beckhoff Video
This was last week’s Mastering the Machine video on the Beckhoff PLC platform and TwinCAT. I am working on the programming part, it should be out in a few weeks. If you want a copy of the document I showed …
PLCnext Webinar
Friday, November 19, 2021 was the one year anniversary of the Automation Academy, my system integration training website! I do these webinars every two weeks as live Zoom events, part of the Academy’s events. This webinar was on PLCnext, Phoenix …
Ladder Logic 309: Allen-Bradley DDE/OPC Link to Excel
It’s been a while since I’ve added to the Ladder Logic series, so this post serves several purposes. It serves as the 7th video in the ControlLogix Odyssey series, it will be posted on YouTube as an ad, and it …
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The Case for Ladder Logic
Lately I have seen a lot of posts promoting Structured Text on forums and Linked In. Structured Text is one of the 5 (or 6) standard PLC languages described in IEC 61131-3. While I have used ST in the past …
Ladder Logic 404: VFD Encoder Control/Siemens
Today’s post doubles as a Ladder Logic series post and an introduction to the last videos in the Siemens Step 7 Odyssey series on my YouTube channel. Last week I covered a bit about how a Variable Frequency Drive interfaces …
Videos and Online Training
As I’ve mentioned in my last few posts, I’ve been creating a lot of videos lately, and have been working on various online courses. The picture above is a Camtasia (the software I use for video editing) screen shot of …
Ladder Logic 309: Allen-Bradley Produced-Consumed Tags (Video)
Today’s post is a continuation on Jason Lafever’s questions on PLC to PLC communications. PLCs often have a need to send messages to each other, and all have some method of directly sending a message to read or write tags …
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Ladder Logic 308: Allen-Bradley’s MSG (Message) Instruction – Video
Today’s video is in response to a post I put on my Facebook automation forum, Automation Training. Jason Lafever asked if I would cover a bit on Allen-Bradley’s MSG (Message) Instruction, and cover Produced-Consumed Tags. I decided to split these …
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Ladder Logic 307: Data Average and Archive
Today’s post is in response to Yusuf Shaikh, who asked a question in a Facebook forum on PLCs. He asked “How to calculate average of drive current tag for every 15 seconds in Micrologix 1400 PLC?“ Of course there are …