From the course: PLC Program Flow and Control Instructions

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Illustrate FFL operation, part 2

Illustrate FFL operation, part 2 - Ladder Logic Tutorial

From the course: PLC Program Flow and Control Instructions

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Illustrate FFL operation, part 2

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- [Instructor] Now to unload the data, unload switch is used. The unload operation goes this way. The unload instruction position points at position six. Now, on a false to true transition, the unload instruction sends the values at position zero to the destination address, output six. It is a FIFO instruction, so the first value will be shown on the LED display. Now the position will change to five. This causes all the data of the FIFO file to shift one position towards the starting address of the file. Position five is the position that's getting emptied. Now on the next false to true transition the element instruction will increment position to position four, indicating that this time this is the position will get empty. Again, unloading and displaying the value of the starting address of the file. This causes all data of the FIFO file to shift one position towards the starting address of the file and the…

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