Course Content

  • Ladder Logic of Interlock Circuit

Course Content


In an interlock circuit, the wires are connected in a ladder-like fashion. This circuit has three states:

  • the power supply is on.
  • the power supply is off.
  • some other condition that can be used to control whether power supply should be on or off.

  • Transitive Closure
  • Conditionals
  • Recursive Closure
  • Alternatives

The ladder logic is used in computing circuits to control the flow of electricity. It can be seen as a series of switches, each controlled by one input pin, that connect to an output pin.

In order to use Ladder Logic, first of all, you need to understand how it works. Ladder Logic uses "L" shaped components called "ladder" which are connected in series or parallel depending on the task at hand. The "L" shaped ladder components provide a stepping stone for the user's design process by following these steps:

  • Start with one end of the ladder as your input node and start from there.
  • Connect the input node's outputs to one side of your next step (the output node). This will be your new input node.
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A Ladder Logic of Interlock Circuit has the following four components: 1) two switches, 2) a relay, 3) an indicator lamp, and 4) an interrupter. The relay is used to switch the power from one source to another; the indicator lamp can be turned on or off by the relay; and the interrupter can be used to prevent power from flowing if there are any faults in the electrical system.

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