brk - PLC Programming & Automation

FOR and BRK on a ControlLogix: The Indexed Loop in Ladder, and the Scan It Eats

Panel of the five FOR operands filled in for a 500-element sweep: routine name Scan_Buffer, index Buf_Idx as a DINT written by the instruction, initial value 0, terminal value 499, step size 1, giving 500 passes with no parameters passed in

FOR and BRK on a ControlLogix: The Indexed Loop in Ladder, and the Scan It Eats A 50 ms periodic task that had been running at 3.6 ms started reporting 41 ms, and the only change in the project was one new rung holding a FOR instruction with a terminal value of 499. Nothing was … Read more