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

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Part 1: Counting sheets

Part 1: Counting sheets - Ladder Logic Tutorial

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

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Part 1: Counting sheets

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- [Narrator] Let's start building the Ladder Logic program. When starting a PLC Ladder Logic, always try to break down the problem one step at a time. It makes it easier for you to program the task, and also for debugging purposes. Let's look at the first task. The start push button is pressed and let go. A stacker starts stacking sheets of wood and then when we have 12 sheets, the conveyor starts. I need to use a start push button to keep it on, even after letting go the start push button. Because we cannot expect a technician to keep holding the start push button while stacking the sheets. So we use an XIC for this example, and we'll create an internal tag, we name it as Start_process. And seal the start push button to keep the start process on. Now, as soon as the push button is pressed, the XIC instruction is activated, instruction is highlighted, and the internal tag is activated. The bit status is one. And as soon as the internal tag is one, the XIC and the seal in instruction…

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