How to Troubleshoot a PLC - Ladder Logic

We will look at how to troubleshoot plc racing conditions. Two examples are explained in racing conditions in the PLC. The PLC will update only at the end of the program logic. Items set will not happen until the I/O is refreshed. How to trigger events when you want them is discussed. Your control system does not work. Where do you start? Let’s walk through a series of questions to determine where the problem lies. More information can be obtained on our website. https://accautomation.ca/how-to-troubleshoot-a-plc/ 00:00 Troubleshooting PLC Examples - Using one-shots in the PLC 00:25 Set / Reset Racing Condition 01:04 Sequence of PLC Scan 01:30 Creating PLC One-Shot Inputs 02:13 Correcting the PLC program and test 02:35 Move Instructions not working 03:22 Racing condition - PLC Scan Operation 03:48 Correct the PLC Move and test program https://www.accautomation.ca