Why are PLC, SCADA and HMI Right for Industrial Automation?

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The industrial automation peaked when you use automated control like Programmable Logic Controller (PLC), Computer Numerical Control (CNC), Remote Terminal Unit (RTU) etc. They help in controlling industrial processes and machinery, replacing manual intervention and dangerous assembly operations, which are automated.

Functional Elements of Industrial Automation

Industrial Automation consists of an array of elements, which are well synchronized with each other. It performs functions such as controlling, sensing, supervision and monitoring of industrial processes. Functionally, industrial automation includes field-level (Sensors & Actuators), Control level, Supervisory, production control level (SCADA) and Information & enterprise level (MES & ERP).

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Industrial automation includes field-level (Sensors & Actuators), Control level, Supervisory, production control level (SCADA), Human-Machine Interface (HMI) and Information & enterprise level (MES & ERP).

Field level of Industrial Automation

At the bottom level  of industrial automation, sensors and actuators are used to collect physical process signals, which helps them measure pressure, flow, temperature, etc. It then converts them into pneumatic and electrical. For instance, LDR, thermocouple, strain gauge etc.

We can use these sensors that are used for processing and analyzing it. This helps in decision making, leading to produce the control output. Control systems such as Programmable Logic controllers (PLCs), RTUs are connected to the sensors. They help you produce the targeted output by providing the signals in accordance with your program and set values.

 Control Level of Industrial Automation

This level consists of control elements, microprocessor-based electronic or just simply use industrial computers that accept the signals from different sensors as well as command signals that come from human operators. These controllers can be of two types; one is analogue and the other, digital systems. All these can differ based on the structure of control nature. The signals from the sensors are processed by a controller, which produces the control output to different devices, which also depends on the same.

PLC (Programmable logic controller) is a special form of microprocessor-based controller. It uses programmable memory to help store instructions and execute like logical, sequencing, timing, counting and arithmetic to control machines and their processes. It contains CPU, digital I/O, analogue I/O and communication modules, which can smoothly operate in an industrial environment. They are conditioned to control different process parameters using the program, written in accordance with the industrial automation processes.

Supervisory control and production control level

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Most of their systems contain Distribution Control System (DCS) or Supervisory Control and Data Acquisition (SCADA) and HMI software at this industrial automation specific level.

The last level of control is the SCADA systems, which controls the smaller subsystems. It consists of two things: HMI (Human-Machine Interface) and process computers. With the help of these personal computers, we can perform elevated level control operations such as set point computations, performance monitoring, diagnostics, start-up, shut down and other emergency operations. Most of their systems contain Distribution Control System (DCS) or Supervisory Control and Data Acquisition (SCADA) and HMI software at this specific level.

In conclusion, these were some of the steps that PLC, SCADA and HMI perform at industrial automation, meanwhile automation programming and integration play a crucial role as well. If you require the same for your business/plant as well, then you can implement your project with us right now, which changes how we work. #CTISUPPLY.


CTI SUPPLY built up a group of well-qualified senior engineering teams with a great number of in-house experts and PLC programmers in Vietnam. We are available to take on different projects in scale, even on short notice, and quickly ramp up by working as an extension of your internal team. Our vast experience allows us to offer custom and application specific training as an added benefit to our clients.

With over years of experience in high-tech machine programming, CTI SUPPLY’s design team are able to simplify SCADA prototype process as our main package of your choice. We can also supply you with drawings and documentation for all your equipment builds.

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Hotline: (+84) 91 190 1717, Emailinfo@ctisupply.vn

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