Logical Functions

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  • The simulator: logics.exe (click to download). The simulator runs immediately after the download by clicking Open in the download window. Alternatively, you can first save a copy of the exe-file on any directory (folder) on your PC and then run the exe-file, which starts the simulator.

Description of the system to be simulated

Four different simple logic (boolean) systems are simulated. The user can set the switches in off- or on-position (input signal), and a lamp (output signal) is lit or not dependent on the logic function between the inputs and the output.


The aim is to understand the fundamental logic functions.


Logic control is important in most automation systems. Some examples:

  • The motor is stopped when the traversal crane has reached its end position.
  • The lamp is lit when the switch is turned on.
  • The valve is closed when the specified water level has been reached.

If you are to develop a logic control system you must master the fundamental logic functions.


Find the logic function implemented in each of the different systems in the simulator.

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Updated 21. January 2008. Developed by Finn Haugen. E-mail: finn@techteach.no.