From the course: PLC Sequencer Logic

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Three-machine ladder logic

Three-machine ladder logic - Ladder Logic Tutorial

From the course: PLC Sequencer Logic

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Three-machine ladder logic

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- [Instructor] For the ladder logic solution, first, I'm going to use a timer to achieve the false to true transition for the sequencer compare instruction. The timer is set to check every two seconds. And using the timer done bit to reset it again. Now the timer will keep timing as long as the products are not done yet, two or more machines. So, I'm going to use an XIO instruction using the green pilot light in the same rung. Then, adding the sequencer compare instruction in the second rung, and having the timer done bit in the same rung. So the done bit helps to increment and move through the different steps. Then using the found bit from the control file of the sequencer compare instruction to turn on the green light. The found bit is on when the source values match the data inside the instruction file. Finally, using the reset push button to reset the process when the products are removed.

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