How does a PLC control a machine?

PLCs communicate, monitor and control automated processes like assembly lines, machine functions, or robotic devices. A PLC’s functions are divided into three main categories: inputs, outputs and the CPU. PLCs capture data from the plant floor by monitoring inputs that machines and devices are connected to.

What are the input and output devices that are connected to PLC?

In a PLC system there will usually be dedicated modules for inputs and dedicated modules for outputs. An input module detects the status of input signals such as push-buttons, switches, temperature sensors, etc.. An output module controls devices such as relays, motor starters, lights, etc.

What are the controllers used in the system using PLC process?

How programmable logic controllers work. Each PLC system has three modules namely: CPU module, power supply module and one or more input/output (I/O) module. This module is comprised of a central processor and its memory component.

What is output device in PLC?

The output ports of a PLC are relay or opto isolator with transistor or triac, depending on the devices that are to be switched on or off. Generally, the digital signal from an output channel of a PLC is used to control an actuator, which in turn controls some process.

What is PLC input device?

Digital Inputs include push-buttons, limit switches, relay contacts, proximity switches, photo sensors (On/Off), pressure switches and more. Digital inputs devices are available in both DC as well as AC and some are voltage independent such as a switch contact. A less common PLC input is the High Speed Counter (HSC).

What are the input devices of PLC?

Some examples of input devices include:

• Switches and push buttons.
• Sensing devices.
• Limit switches.
• Proximity sensors.
• Photoelectric Sensors.
• Condition sensors.
• Vacuum switches.
• Temperature switches.

What is PLC connection?

PLC Connect supports OPC, serial and dialed communication. Collecting variables from a PLC and organizing them into object types enhances the overview and understanding of the system. PLC Connect gives operators the same user experience for devices controlled by a PLC as for embedded 800xA DCS controllers.