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Entries for 'Jirka Hladis'

How To Disassemble and Fix a Fried S7-1200 PLC
Jirka Hladis

How To Disassemble and Fix a Fried S7-1200 PLC

Don’t you hate it when your coworker inadvertently wires up a 24V PLC to wall power and lets out the magic smoke? Just such a mishap happened in our lab a while back and the broken PLC was sitting around in the junk bin for a while. Figuring there wasn't anything to lose, I decided to try my luck and see if it could be revived.  Fortunately, the Siemens S7-1200 series PLCs are quite easy to disassemble, and I was able to replace the damaged components and restore it t...

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How To Make a Simple Time-lapse IP Web Camera Using a Raspberry Pi
Jirka Hladis

How To Make a Simple Time-lapse IP Web Camera Using a Raspberry Pi

When it comes to capturing time-lapse videos, there are numerous off-the-shelf solutions and libraries out there. For last year’s FedEx Day project, I decided to implement a minimalist solution on a Raspberry Pi using only the default image capture API that ships with Raspbian (raspistill), the built-in UNIX task-scheduler (cron), a video conversion utility (avconv), and a lightweight web server (lighttpd). Set up your Raspberry Pi with the latest version of Raspbian by burning ...

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How to Connect to an Allen-Bradley SLC 500 PLC
Jirka Hladis

How to Connect to an Allen-Bradley SLC 500 PLC

With most modern PLCs, all you need to start programming or troubleshooting is to plug in your laptop with a plain old ethernet cable. Older PLCs, however, tend to use a myriad of different cables and protocols. With a large number of legacy systems, the original programming cables and software are often long lost by the time you want to make updates or need to troubleshoot an issue. One of the most popular series of PLCs from the 1990s to mid-2000s is the Allen-Bradly SLC 500 series: SLC 5/0...

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