Programmable Logic Controller (PLC) Buying Guide

Your Guide to Buying Programmable Logic Controller (PLC)

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What is a PLC (Programmable Logic Controller)?

A PLC or Programmable Logic Controller is a digitally operated machine which has been designed to monitor the input devices and makes decisions based upon a customized program in order to provide outputs for the control of processes, i.e. relays or motor starters.

These instructions are stored in the internal storage which receives signals from the user through controlled devices, such as sensors and switches which are implemented in a precise manner. PLCs are widely used in the manufacturing industry like assembly lines that require high precision, reliability control, fault diagnosis.

Advantages of PLCs 

1.PLCs are very durable. They are rugged in design so that they can operate even when subjected to harsh vibrations, heat, and high humidity. Connecting wiring is sometimes time-consuming.
2.PLCs have built-in interfaces for inputs and outputs.
3.PLCs are easy to program, and the programming language is easy for operators to understand. Troubleshooting and solving problems require high-skill workers.
4.A wide range of control applications and small size PLC failures can cause long delays in production because they are often not that easy to troubleshoot and repair.

Components of PLC

Input/Output Modules
Power Supply
Central Processing Unit CPU
Peripheral Device
Power Supply

Ways to Choose the Right PLC (Programmable Logic Controller)

#1)Determine whether the system is new or existing

The system needs to be compatible with new components therefore it is important to determine whether the system needs to be installed from scratch or are there any existing products already installed.

#2)Environmental issue

Certain environmental conditions may affect the working and operation of a controller. If the application requires any extreme environmental conditions or has specific requirements at your facility that must be met, you will need to either research products to meet those specifications or design the installation to meet the requirements.

#3)Additional features

Some processes require customized PLCs for their applications like a real-time clock or a high-speed counter or a special module, or other design features. In such cases, buyers will most likely need to contact a manufacturer directly for a custom order or will purchase additional specialty modules accordingly.

#4)Number and type of I/O’s

For best and economical use it is important to know the number and type of input and output required in a system. It is necessary to determine what type of Output is required, whether you require a digital output or you need an analog output.

Also, the number and type of I/O required in a system is directly related with to the number of I/O required in the system. So there is a need to choose a controller that supports required I/O and its requirements and has modules that support your signal types.

#5)The memory size of PLC

There should be enough space in memory to store its programming. So it is important to determine the memory size required for the process.

Why Buy Programmable Logic Controllers Online at Industrybuying

Industrybuying showcases a wide variety of the best programmable logic controllers online. The portal allows you to buy PLCs at the best prices. You could choose from PLC – network and communication modules, PLC accessories, relay type PLCs, transistor sourcing type devices, analog/temp i/o modules, basic and high-performance CPU PLCs, transistor sinking type devices, high-speed counter modules, and PLC process CPUs programmable temperature controllers all the way to Ethernet Converters.

The e-commerce company has tied up with the likes of Mitsubishi, Omron, Fatex, Selec and GIC to make the best quality PLC available to you. Other industrial automation devices that you might like to shop online are encoders, relays, and PID controllers, to name a few.


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