Siemens PLCs
Continuing the series I began last week with the Allen-Bradley PLC platform, this week I am discussing the Siemens family. My first exposure to Siemens PLCs was in the late 1990s when I customer wanted a quote on upgrading their …
Tag: PLCs
Allen-Bradley PLCs
Most readers of this blog know that I go out of my way to be non-brand-specific and unbiased in my presentation of automation topics. So far I have refused to place advertisements for any manufacturer’s on this site, though I …
Serial Device Communications
Today’s post is in response to Amit’s question on a previous topic about leak testers. He asks “What is the process to send or receive data from a Cosmo leak unit tester?” Rather than address Cosmo specifically, I decided to …
Ladder Logic 207: Interrupts and Periodic Tasks
Today’s post is in response to Darko’s comment on my Ladder Logic 206: Scanning post. He mentioned that readers might want to learn a little bit about interrupts. It can be difficult to discuss this subject generically since different manufacturers …
More Startup and Debug
After spending the last several months working on some of my entrepreneurial ideas and teaching PLC programming classes, I just spent the last couple of weeks contracting on a machine and system startup/debug job. I feel very fortunate to have …
The Importance Of Machine Safety And Hiring A PLC Programming Specialist
Today’s article is a guest post from Automation Solutions, a Melbourne, Australia-based company. If you would like to post an article on this site, let me know! The Importance Of Machine Safety And Hiring A PLC Programming Specialist. Automated production …
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PLC Manufacturer Rankings
After spending the last couple of weeks teaching PLC programming, I decided to do a little research on the popularity of the different manufacturer’s platforms worldwide. I have been asked many times in the past who the biggest, most popular, …
Ladder Logic 301: Toggle
Today’s post is the first “advanced” topic I have covered in this blog. By advanced, I mean that rather than covering basic information on Ladder Logic and program structure like I did in my 100 Series, or general programming routines …
Safety PLCs
As safety systems become more and more complex (primarily because of the influence of European safety standards), the cost-effectiveness of safety PLCs has improved. I first noticed Safety PLCs being used only about five or six years ago, though according …
Ladder Logic 206: Scanning
In last week’s post I mentioned that there was a mistake in the organization chart I have been using in my ladder logic posts. My friend Gordon mentioned it at lunch a couple of weeks ago and when I checked …