Understanding SCADA: Monitoring and Data Acquisition Systems in Modern Industry

SCADA (Supervisory Control and Data Acquisition) is a core industrial automation control system that underpins modern industry.

What is SCADA used for?

SCADA is employed across many sectors, including energy, food and beverage, manufacturing, oil and gas, power, recycling, transportation, water and wastewater, and many others.

Energy

Food & Beverage

Manufacturing

Oil & Gas

Power

Recycling

Transportation

Water & Wastewater

And many more

SCADA systems are used by private companies and public‑sector service providers, scaling from simple configurations to large, complex projects.

They operate behind the scenes in places such as supermarkets, refineries, wastewater treatment plants, and even homes.

How does a SCADA system work?

A SCADA deployment combines multiple software and hardware elements that enable organizations to monitor, collect, and process data, control machines and equipment (e.g., valves, pumps, motors) via HMI software, and log events.

In a basic architecture, sensor or manual input data is sent to a PLC (Programmable Logic Controller) or RTU (Remote Terminal Unit), which forwards it to a computer running SCADA software. The software analyzes and displays the data, helping operators reduce waste and improve process efficiency.

Effective SCADA implementations can save significant time and money, as demonstrated by numerous case studies highlighting the benefits of modern SCADA solutions such as Ignition.

SCADA Basic Architecture

Evolution of SCADA

In the 1950s, the first micro‑computers were developed for industrial use. The 1960s saw the adoption of small computers for remote monitoring. The term "SCADA" was coined in the early 1970s, coinciding with the rise of microprocessors and PLCs, which greatly enhanced monitoring and control capabilities.

During the 1980s and 1990s, SCADA leveraged LANs to connect to other systems and introduced PC‑based HMI software. In the 1990s and early 2000s, SQL databases became the IT standard, but many SCADA developers did not adopt them, leading to a divergence between control and IT domains.

Modern SCADA Systems

Today, SCADA allows real‑time workshop data to be accessed from anywhere in the world, enabling data‑driven decisions for governments, enterprises, and individuals. Modern SCADA platforms often include rapid application development (RAD) features that let users design applications without deep software development expertise.

Integrating modern IT standards such as SQL and web‑based applications greatly improves SCADA efficiency, security, productivity, and reliability. Using SQL databases facilitates seamless integration with MES and ERP systems, allowing data to flow across the organization.

Historical SCADA data stored in SQL databases also supports trend analysis and advanced analytics.

Ignition HMI / SCADA Software

Ignition by Inductive Automation is an industrial automation platform adopted by many organizations for HMI/SCADA needs. Since 2010, Ignition has been deployed in thousands of sites across more than 70 countries, offering strong performance at a lower cost than many alternatives.

Key reasons enterprises choose Ignition include:

Use of modern IT practices, ensuring compatibility with current SCADA components.

Unique licensing model that charges a fixed fee per server, allowing unlimited clients and tags.

Web‑based deployment that can be downloaded and installed in minutes, with instant client startup or updates.

The vendor’s “dream‑to‑do” philosophy, demonstrated by powerful demos that showcase the platform’s capabilities.

For more details, see the original article at https://architect.pub/what-scada-monitoring-and-data-acquisition-system.