## Introduction

Before a light, buzzer, fan, or any type of electrical load turns on, there is a circuit that determines what conditions must be met in order for it to happen. This circuit is known as a control circuit. The input components (buttons and switches) in the circuit can be normally closed (NC) or normally open (NO). The buttons and switches can be put in parallel, in series, or in a combination of series and parallel.

The way the inputs are connected in a circuit and the type of contact used (NO vs. NC) determine the control logic of the circuit. The basic control logic of these functions are: AND, OR, NOT, NAND, and NOR. You will learn the differences between these control logic functions and how to use them in a circuit to control the operation of electrical loads.

## Objectives

- Understand the basic control logic functions and the differences between them.
- Create a simple circuit in Automation Studio using the basic control logic functions.
- Wire up a simple circuit using the basic control logic functions.
- Understand the difference between the "decision" portion and the "action" portion of a circuit.
- Learn how to properly wire an electrical load in a circuit.

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