From the course: Learning PLC Ladder Logic: 1 The Basics

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Part 2: Running the conveyer

Part 2: Running the conveyer - Ladder Logic Tutorial

From the course: Learning PLC Ladder Logic: 1 The Basics

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Part 2: Running the conveyer

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- [Instructor] The next step is after counting the 12 sheets, the conveyor starts again until it reaches position B. So, we need to use the counter done bit after the counter is done counting the 12 sheets and use an XIC instruction for the counter done bit. The output of that rung is the conveyor starting and output is the conveyor motor. Then to make the conveyor stop when reaching position B which is sensor B, we need to add a condition in that specific rung to keep the conveyor on but stops only when reaching to sensor B. So now let's think about using XIC or XIO instruction for sensor B. If we use XIC, then the rung will look this way. In this case, once the counter is done counting and the bit is activated, the conveyor needs to start, but if we use XIC, then XIC is not activate yet, because we're not in position B yet and the memory address bit is zero, so the conveyor will not start in this case. But if we use XIO instruction, remember that XIO is active when the memory…

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