RSS file) and a copy of the RSLogix 500 programming software (contact your A-B distributor if you need one), you can open the project and check the communication settings by double-clicking on Channel Configuration under the controller section of the project tree: If you have access to the original PLC program (typically a. This blog post summarizes the different ways that you can connect to these PLCs and some of the pitfalls to look out for. One of the most popular series of PLCs from the 1990s to mid-2000s is the Allen-Bradly SLC 500 series: SLC 5/01, SLC 5/02, SLC 5/03, SLC 5/04, and SLC 5/05. 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. Older PLCs, however, tend to use a myriad of different cables and protocols. With most modern PLCs, all you need to start programming or troubleshooting is to plug in your laptop with a plain old ethernet cable.
