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Dear support and forum members, My name is Robin from the Netherlands, and my boss gave me the ambitious opportunity to program a seemingly easy wood-sanding machine. For this project we bought a Vision130 (V130-33-R34) The machine has: -A conveyor belt for transporting a wooden board, with frequency regulator for the speed. -A safety door lock. (Machine should only be operational when this door is locked) -4 motorized, rotating sanding brushes (2 of these brushes have frequency regulators for the speed.) -4 motorized height adjustments for the sanding rolls (with encoders). -Thermal protection. -The standard buttons like: main switch, emergency stop button, start / stop button, and also an electronic stop. As I'm completely new to ladder programming, I'm struggling with some issues already. I'm familiar to programming languages such as C#, C++, SQL and I know a little Structured Text. I need to address Memory Integers to some states of the machine (so I can 'use' the output of the last line as a condition (input) for the next line. I chose not to use a Memory Bit, so I can address multiple states. In the file that I enclosed in this post, there is the program as far as I could get it to this point. I do understand many of the logic that comes with this machine, however my background is software engineering with no knowledge of PLC's or electronic components. I find it difficult to understand some of the tutorials and manuals that I have read so far. Hopefully there is a smart guy or girl who can help me with this. Regards, Robin Schuurmachine PLC Ladder.vlp