sequencer - PLC Programming & Automation

SQO and SQI on a ControlLogix: the Sequencer That Will Not Step

A nine-element DINT array drawn as the sequencer table for an eight-station indexer, each element showing its binary step pattern and what the step does, with element 0 marked as the park position, the position pointer at element 3, and a wrap arrow back to element 1

SQO and SQI on a ControlLogix: the Sequencer That Will Not Step SeqCtl.POS sat at 1 for three days on a 1756-L83E while the indexer kept running on step one, and the rung holding the SQO had nothing in it at all — left rail, instruction, right rail. That is the entire fault, and the … Read more