Interview questions on Modbus

Below is the list of the most important interview questions on Modbus: 1. What is Modbus and how does it work? Modbus is an application protocol that defines rules for organizing and interpreting data and is essentially a messaging structure that is independent of the underlying physical layer. It is an open-source protocol and is … Read more

Top 10 DCS Companies in the world

Distributed Control Systems (DCS) is being used to control a production plant or a process for over 40 years now. They were commercialized with the launch of TDC 2000 by Honeywell and CENTUM systems by Yokohama. Distributed control systems have been evolving since then. Here is the list of the top 10 leading players in … Read more

Top 10 Industrial Automation companies in the world

Industrial automation and robotics enable large-scale manufacturing at a lower cost. It enables an increase in productivity and product quality. There are many industrial automation service providers around the globe. Here is the list of the top 10 industrial automation companies in the world. Top 10 Industrial Automation companies Siemens AG – Germany ABB – … Read more

Interview questions on PLC (Programmable Logic Controllers)

Here are the most frequently asked Interview questions on PLC. This article aims to cover most of the interview questions on programmable logic controllers so as to prepare you to crack a job interview. List of Interview questions on PLC What is a PLC? PLC stands for ‘Programmable Logic Controller’. It is an industrial computer … Read more

Difference between PLC and DCS

In the world of industrial automation, Programmable logic controllers (PLC) and Distributed Control Systems (DCS) are used to control or automate a process or a machine. They monitor the field signals and operator inputs and make decisions based on how they are programmed. Here you can understand the difference between PLC and DCS. What is … Read more

Difference between NPN and PNP transistors | NPN vs PNP Transistor

The bipolar junction transistors exist as NPN and PNP types. This article intents to help you understand the difference between these two types and how to use them in a circuit. Also, this will be helpful to automation engineers and instrumentation engineers in understanding 3 wire sensor connections. Transistors are made by combining two types … Read more

Types of Proximity sensors and their applications

Proximity sensors are used to detect the presence of an object without any direct contact. It is used as an alternative to the limit switches. There are various types of proximity sensors available in the market. Their invention led to a revolution in the field of industrial automation and robotics. Proximity switches were developed by Wilfried … Read more

Electromechanical relays vs solid-state relays

Relays are electrically operated switching devices, used to gain control over processes and circuits. Based on their principle of operation they are classified into two types: Solid-state relays and electromechanical relays. In this article let us discuss each one of them, their differences and similarities. Comparison of electromechanical and solid-state relays Electromechanical relays Solid-state relays … Read more

Difference between NO and NC

In every control circuits and automation systems, logic is developed based on the open or closed state of switches, sensors or relays. Hence it is mandatory to know the concept behind NO/NC. Normally open(NO) and Normally closed (NC) are terms used to define the states of switches, sensors or relay contacts under when its coil … Read more

Digital I/O and Analog I/O

Automation has become the backbone of almost all industries worldwide. Digital IO and analog IO are the most basic terms of any PLC/DCS based control and microcontroller-based applications. A PLC collects data from the field process it as pre-programmed and produces one or more outputs. The data that is collected from the field is considered … Read more