From the course: PLC Program Flow and Control Instructions
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Illustrate FFL operation, part 1 - Ladder Logic Tutorial
From the course: PLC Program Flow and Control Instructions
Illustrate FFL operation, part 1
- [Instructor] For the ladder logic program, I will use two toggle switches to achieve the false the true transition, for the instructions. I'm choosing the numbers randomly to load them into the file. If you want to practice, you can certainly choose any other numbers. First, to input number two, using a thumbwheel, the load switch is activated. Now the FIFO load instruction loads the data from the source to the FIFO stack, starting from N7:0. You can see, I have demonstrated the numbers in both binary and decimal. Now the next value to input is four, the load switch needs to be opened and closed again for the false to true transition, the same process happens and you see that the position now points to one. Meaning that the next available position to load the data is now position one N7:1. The same process continues for the next word into the FIFO file until reaching the number of the file length.
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Contents
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Word shift operations intro2m 19s
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(Locked)
First in, first out (FIFO) instruction2m 24s
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(Locked)
FFL (FIFO load) parameters, part 11m 45s
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(Locked)
FFL (FIFO load) parameters, part 22m 43s
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(Locked)
FFU (FIFO unload) parameters1m 2s
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(Locked)
Illustrate FIFO operation: Example1m 24s
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(Locked)
Illustrate FFL operation, part 11m 17s
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(Locked)
Illustrate FFL operation, part 21m 33s
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(Locked)
Example program1m 59s
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