Programmable Logic Controllers Overview

The terminal where the positive side of the power supply is connected to the PLC.

The terminal where the negative side of the power supply is connected to the PLC.

Terminals on the PLC where it receives signals from sensors, switches, and other input devices.

Terminals on the PLC where it sends control signals to actuators like motors, relays, and lights.

An electrically operated switch that allows the PLC to control higher voltage loads that could not be connected directly.

A Programmable Logic Controller (PLC) is an industrial computer that controls processes by monitoring inputs from sensors and controlling outputs to actuators based on its programmed logic.

The power supply provides electricity to the PLC and its components.

Input modules receive signals from sensors and input devices.

Output modules send signals to actuators.

The CPU is the brain of the PLC, it processes data, executes control instructions, and manages the PLC's operations.

A programming device is used to write and configure the logic that controls the PLC.

A normally open contact is like a switch that is open when at rest, preventing current flow. It only closes when activated.

A normally closed contact is like a switch that is closed when at rest, allowing current flow. It only opens when activated.

The main function of a PLC is to monitor inputs from sensors and control outputs to actuators, based on programmed logic.

An input device provides information to the PLC, like a sensor detecting temperature or a switch being pressed.

An output device receives a signal from the PLC and performs an action, like turning a motor on or turning a light off.

A PLC operates by monitoring inputs, making decisions based on programmed logic, and controlling outputs to actuators.

The main components of a Siemens LOGO PLC are the power supply, input terminals, and output terminals.

The power supply provides the electrical energy to operate the PLC, ensuring its functionality.

Input terminals receive signals from sensors and switches, transmitting the data to the PLC.

Output terminals send control signals to actuators, such as motors or lights, to perform actions.

A PLC instruction that counts input or output signals within the PLC program.

The primary purpose of a PLC is to control industrial processes by monitoring inputs from sensors and controlling outputs to actuators based on its programmed logic.

A component that receives data from sensors, switches, or other input devices.

A component that sends control signals to actuators like motors, relays, or lights

The PLC receives input signals, processes them based on its programmed logic, and then sends control signals to output devices.

Siemens LOGO PLC consists of a power supply, input terminals, output terminals, and a central processing unit (CPU).

A ladder diagram is a graphical programming language used to represent the logic of a PLC program. It consists of rungs, input contacts, and output coils.

A normally open contact is like a switch that is open when at rest, preventing current flow. It only closes when activated.

A type of input contact that is initially closed, allowing current to flow until the contact is activated.

An electrically operated switch used to control a circuit by means of an electromagnetic mechanism. It's used in PLC's to control high-voltage loads that the PLC cannot directly handle.

The PLC receives input signals from sensors, switches, and other input devices through these terminals.

The PLC sends control signals to actuators like motors, relays, and lights through these terminals.

They connect the PLC to the input and output devices, allowing it to receive information and send control signals.

A PLC can control high-voltage loads, such as motors that operate at different voltages than the PLC's output, by using a relay.

A PLC program is defined as a set of instructions that the PLC follows to control a process based on inputs from input devices and outputs to actuators.