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Today’s highly increasing competitiveness over the industry demands high quality and most consistent products with a competitive price. To address this challenge number of industries considering various new product designs and integrated manufacturing techniques in parallel with the use of automated devices.

One of the remarkable and influential moves for getting the solutions to the above-mentioned challenge is industrial automation. Industrial Automation facilitates to increase in product quality, reliability, and production rate while reducing production and design costs by adopting new, innovative and integrated technologies and services.What is Industrial Automation

What is Industrial Automation?

Automation takes a step further mechanization that uses a particular machinery mechanism aided human operators for performing a task. Mechanization is the manual operation of a task using powered machinery that depends on human decision-making.

On the other hand, automation replaces human involvement with the use of logical programming commands and powerful machinery.What is Industrial Automation definition

Industrial Automation is the replacement with computers and machines to that of human thinking. The word Automation gives the meaning ‘self dictating’ or ‘a mechanism move by itself’ that derived from the Greek words Auto and Matos where auto means self while Matos means moving.

In a brief, industrial automation can be defined as the use of set technologies and automatic control devices that results in the automatic operation and control of industrial processes without significant human intervention and achieving superior performance than manual control. These automation devices include PLCs, PCs, PACs, etc. and technologies include various industrial communication systems.What is Industrial Automation System block diagram

The above figure shows the power plant automation provided by Siemens for achieving sustainable, safe, and economic operations. It provides total integrated automation (TIA) by automating every section of the power plant with efficient control devices, field sensors, and actuating devices. In this automation, SIMATIC modules (PLCs) are used as control devices while WinCC provides an effective graphical interface.

Why Industrial Automation? (Advantages of Automation System)

  • To increase productivity

Automation of factory or manufacturing or process plant improves production rate through better control of production. It helps to produce mass production by drastically reducing assembly time per product with greater production quality. Therefore, a given labor input it produces a large amount of output.Advantages of Industrial Automation.

  • To provide the optimum cost of operation

Integration of various processes in the industry with automated machinery minimizes cycle times and effort and hence the need of human labor gets reduced. Thus the investment in employees has been saved with automation.

  • To improve product quality

Since automation reduces human involvement, the possibility of human errors also gets eliminated. Uniformity and product quality with greater conformity can be maintained with automation by adaptively controlling and monitoring the industrial processes in all stages right from inception of a product to an end product.

  • To reduce routine checks

Automation completely reduces the need for manual checking of various process parameters. By taking advantage of automation technologies, industrial processes automatically adjust process variables to set or desired values using closed-loop control techniques.Why Industrial Automation

  • To raise the level of safety

Industrial automation increases the level of safety to personnel by substituting them with automated machines in hazardous working conditions. Traditionally, industrial robots and robotic devices are implemented in such risky and hazardous places.

Hierarchy of an Industrial Automation System

Industrial automation systems can be very complex in nature, having a large number of devices working in synchronization with automation technologies. The figure below describes the hierarchical arrangement of the automation system consisting of different hierarchical levels.

Field Level

It is the lowest level of the automation hierarchy which includes the field devices like sensors and actuators. The main task of these field devices is to transfer the data of processes and machines to the next higher level for monitoring and analysis. And also it includes the controlling of process parameters through actuators. For instance, we can describe this level as the eyes and arms of a particular process.

Sensors convert the real-time parameters like temperature, pressure, flow, level, etc into electrical signals. This sensor data further transferred to the controller so as to monitor and analyze the real-time parameters. Some of the sensors include thermocouples, proximity sensors, RTDs, flow meters, etc.

On other hand, actuators convert the electrical signals (from the controllers) into mechanical means to control the processes. Flow control valves, solenoid valves, pneumatic actuators, relays, DC motors, and servo motors are examples of actuators.Hierarchy of an Industrial Automation System

Control Level

This level consists of various automation devices like CNC machines, PLCs, etc., which acquire the process parameters from various sensors. The automatic controllers drive the actuators based on the processed sensor signals and program or control technique.

Programmable Logic Controllers (PLCs) are the most widely used robust industrial controllers which are capable of delivering automatic control functions based on input from sensors. It consists of various modules like CPU, analog I/O, digital I/O, and communication modules. It allows the operator to program a control function or strategy to perform certain automatic operations on the process.

Supervising and Production Control Level

In this level, automatic devices and monitoring systems facilitate the controlling and intervening functions like Human Machine Interface (HMI), supervising various parameters, setting production targets, historical archiving, setting machine start and shutdown, etc.

Mostly, either Distribution Control System (DCS) or Supervisory Control and Data Acquisition (SCADA) HMIs are popularly used in this level.

Information or Enterprise Level

This is the top level of industrial automation which manages the whole automation system. The tasks of this level include production planning, customer and market analysis, orders and sales, etc. So it deals more with commercial activities and less with technical aspects.

And also industrial communication networks are most prominent in industrial automation systems which transfer the information from one level to the other. So these are present in all the levels of the automation system to provide a continuous flow of information. This communication network can be different from one level to the other. Some of these networks include RS485, CAN, DeviceNet, Foundation Field bus, Profibus, etc.

From the above hierarchy, we can conclude that there is continuous information flow from high level to low level and vice-versa. If we assume this graphical way, it is like a pyramid in which as we go up, the information gets aggregated and while going down, we get detailed information about the process.

Types of Industrial Automation Systems

Types of Industrial Automation Systems

1. Fixed or Hard Automation

This type of automation is employed to perform fixed and repetitive operations in order to achieve high production rates. It uses special purpose or dedicated equipment to automate the fixed sequence assembling or processing operations. Once it is employed, it is relatively hard to change or vary the product design. Therefore, it is inflexible in providing product variety, but increases the efficiency with a higher production rate and reduces unit cost.Fixed or Hard Automation

Some of these automated systems are distilled process, paint shops, and conveyors.

2. Programmable Automation

In this automation, a specific class of product changes and also assembling or processing operations can be changed with the modification of the control program in the automated equipment.

This automation is best suited for batch production processes where product volume is medium to high. But in this, it is hard to change and reconfigure the system for a new product or sequence of operations. Therefore, a new product or reconfiguration of a sequence of operations requires a long setup.

Examples of this automation system are numerically controlled machines, paper mills, steel rolling mills, industrial robots, etc.Programmable Automation

3. Flexible or Soft Automation

This automation system provides automatic control equipment that offers great flexibility for making changes in the product design. These changes can be performed quickly through the commands given in the form of codes by the human operators.

This automation allows the manufacturers to produce multiple products with different ranges as a combined combination process rather than separate.

Some of the examples of this automation system are automatic guided vehicles, automobiles, and multipurpose CNC machines.

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