From the course: Learning PLC Ladder Logic: 2 Diving Deeper

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Solution: FRD

Solution: FRD - Ladder Logic Tutorial

From the course: Learning PLC Ladder Logic: 2 Diving Deeper

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Solution: FRD

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- [Instructor] For programming this scenario, the first rung is to having the FRD instruction. The source we need to use the whole input address, so it's local five for input and five is the input module address. Note that for the first rung, no input is placed prior to the FRD instruction. This means the FRD instruction is operating continuously. The second rung is the timer and the destination from the FRD instruction is the timer preset. We put the input switch ahead of the timer so the timer will start when the switch is on and we can control the reset of the timer when needed. Please refer to the timer section from PLC Ladder Logic Programming course to understand more about the timer operation. If we use a push button instead, we can simply use the timer timing bit as as a seal-in instruction to keep the timer working. So let's see how this program works. I'm going to go to the rung. I'll select the…

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