From the course: PLC Program Flow and Control Instructions

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FFU (FIFO unload) parameters

FFU (FIFO unload) parameters - Ladder Logic Tutorial

From the course: PLC Program Flow and Control Instructions

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FFU (FIFO unload) parameters

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- [Instructor] The parameters are the same for both Load and Unload instructions, except that Unload instruction has a destination instead of source. Destination parameter simply specifies where the data is going. Here's an example of having the destination as the LED display. Now, since it's a FIFO instruction, the Unload instruction is used to unload the words from the FIFO stack in the same order as the words were entered. So the operation for the Unload instruction goes this way. First, it unloads the one in position zero, and sends it to the destination address, then shifts the remaining words one position toward the starting address of the file. And then the process continues for unloading the rest of the data from the stack.

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