Programming a Sequencer in Ladder Logic on a PLC is an advanced skill. It’s a technique which utilizes SQI and SQO instructions in order to create a sequence of events which is based on specific steps & allows the PLC to follow a prescribed sequence of events. Although the squencer isn’t something you’d expect to use on a regular basis, it’s an advanced technique which shines in specific applications.
This is a companion discussion topic for the original entry at https://www.solisplc.com/tutorials/plc-sequencer-programming-tutorial-on-sqi-sqo-instructions-in-rslogix-5000-ladder-logic