{"id":7052,"date":"2026-03-07T18:35:42","date_gmt":"2026-03-07T15:35:42","guid":{"rendered":"https:\/\/reltekenerji.com.tr\/scada-nedir-ve-nasil-calisir\/"},"modified":"2026-03-07T18:49:24","modified_gmt":"2026-03-07T15:49:24","slug":"what-is-scada-and-how-does-it-work","status":"publish","type":"post","link":"https:\/\/reltekenerji.com.tr\/en\/what-is-scada-and-how-does-it-work\/","title":{"rendered":"What is SCADA and How Does It Work?"},"content":{"rendered":"\t\t
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What is SCADA and How Does It Work?<\/h1>\t\t\t\t<\/div>\n\t\t\t\t
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\n\tSCADA Systems<\/a>\n<\/span>\u00bb<\/span>\n\tWhat is SCADA and How Does It Work?\n<\/span><\/div><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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What is SCADA and how does it work? SCADA<\/a><\/strong> (Supervisory Control and Data Acquisition) is an integrated system that enables the monitoring of industrial processes from both local and remote locations, data collection, and real-time control of these processes. This structure, which stands for “Supervisory Control and Data Acquisition<\/strong>,” is considered the nervous system of modern industry.<\/p>

It is not merely a monitoring tool, but also a decision support mechanism that manages complex algorithms. It processes thousands of different variables such as pressure, temperature, and flow rate from the field within seconds and presents them to the operator in meaningful graphical formats. Through this structure, equipment in remote areas that are difficult or dangerous to intervene with physically can be managed with a single click from a central control room. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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What is SCADA and What Does It Do?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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So, what is a SCADA system and what does it do? SCADA collects analog and digital signals from the physical world in the field, converts them into digital data packets, and transforms them into analyzable information. The primary function of the system is to provide operational visibility. Not knowing what is happening at a factory or power plant at any given moment can lead to efficiency losses and even serious industrial accidents. <\/p>

This system helps predict potential future malfunctions by maintaining historical data records (historian). Furthermore, thanks to advanced alarm management mechanisms, it instantly alerts operators when any parameter exceeds a critical threshold. Thus, preventive interventions can be made before a major malfunction occurs, ensuring maximum production continuity and facility safety. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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How Do SCADA Systems Work?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Let’s also look at “How Do SCADA Systems Work?<\/strong>” The operating principle of SCADA consists of four basic stages. The first stage is the detection of physical data (heat, speed, pressure, etc.) coming from sensors and actuators in the field. The second stage is the collection of this data by controllers such as RTU (Remote Terminal Unit) or PLC and its translation into a digital language. <\/p>

In the third stage, this digital data is transmitted to the central server via communication infrastructures such as fiber optic cables, radio frequencies, cellular networks, or the internet. In the final stage, SCADA software analyzes this data, converts it into meaningful visual graphics, and displays it on the operator’s HMI screen. When the operator gives a command via this screen (e.g., to close a valve), the process works in reverse, sending the command to the equipment in the field. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Considerations When Choosing SCADA Software<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Choosing the right SCADA software means deciding on a business’s digital future for the next 10-15 years. One of the primary considerations when selecting SCADA<\/strong> software is the system’s scalability. A system monitoring 100 points today cannot be expected to manage 10,000 points tomorrow without performance loss as the facility grows. Therefore, proper planning and scaling are the most critical stages in the process. <\/p>

In addition, the user interface (UI\/UX)<\/strong> design should be simple and clear. An operator getting lost in complex menus during an emergency can lead to irreparable errors. Furthermore, the software being hardware-independent<\/strong> and capable of seamless communication with different brands of PLCs is a significant advantage. A structure that can exchange data with your existing ERP or MES systems (supporting IT\/OT integration) is a fundamental criterion that directly affects your efficiency. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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In Which Sectors Are SCADA Systems Used?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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SCADA systems find their place in almost every modern industry where continuity is critical. The energy sector is the most intensive user of these systems at every stage, from generation to distribution (wind turbines, solar power plants, substations). The uninterrupted flow of energy depends on SCADA’s millisecond monitoring capability. <\/p>

Additionally, it plays a vital role in water and wastewater management<\/strong> facilities for flow control and chemical dosing processes. In oil and natural gas<\/strong> pipelines, leak detection for thousands of kilometers of pipelines is performed with these systems. In the food and pharmaceutical<\/strong> sectors, SCADA use is a necessity for maintaining production standards and backward traceability. In short, wherever there is data, there is SCADA. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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What Are the Types of SCADA?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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SCADA systems<\/strong><\/a> have evolved from simple structures to complex cloud-based ecosystems with the advancement of technology. This variety allows businesses to choose the most suitable solution based on their budget, geographical spread, and security requirements. There are various types of SCADA developed for different needs. Let’s briefly look at them now. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Distributed SCADA Systems <\/h3><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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Distributed SCADA systems share control and data processing tasks among different local processors instead of a single central one. This structure ensures that a malfunction at one point in the system does not cause the entire facility to shut down. It offers high performance, especially in large factories and campus-type facilities, as it evenly distributes the processing load. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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Centralized SCADA Systems <\/h3><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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In this architecture, all control power and data management are centralized in a single main server. Field units (RTU\/PLC) only collect data and await commands from the central unit. It is highly efficient and simpler to set up for medium-sized operations where management needs to be entirely from a single point and tight control is desired. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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Network-Based SCADA Systems <\/h3><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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Network-based SCADA systems are modern structures that can support very high data traffic over local area networks (LAN) or wide area networks (WAN). They offer the possibility of consolidating production facilities in different cities or countries into a single virtual center. Thanks to their flexible expansion capacity, adding new modules to the system is very easy as the business grows. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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Cloud-Based SCADA Systems <\/h3><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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Cloud-based SCADA systems are a new generation solution that minimizes hardware costs and provides access from anywhere with internet connectivity. They eliminate the need for on-premise server hosting, reducing maintenance and update costs. It is an extremely flexible structure, especially enabling mobile teams to monitor and manage field data from their smart devices. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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Distributed Control System (DCS) Integrated SCADA <\/h3><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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This hybrid structure combines SCADA’s wide-area monitoring capability with DCS’s precise process control power. It is typically preferred in very complex and error-intolerant facilities such as petrochemical plants or nuclear power plants. This integration maximizes data integrity, allowing the entire process to be controlled from a single layer. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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Industrial IoT (IIoT) Based SCADA Systems <\/h3><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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IIoT-based SCADA systems collect data not only from PLCs but also directly from smart sensors connected to the internet. This structure, which enables “Big Data” analytics, combines with artificial intelligence algorithms to allow for predictive maintenance. It creates a competitive advantage by shifting decision-making processes from human speed to machine speed. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t

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What is the Difference Between SCADA and DCS Systems? Which System is Right for You? <\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Although SCADA and DCS (Distributed Control System) are often confused, their purposes are different. SCADA is generally ideal for “event-driven” data collection tasks spread over geographically wide areas (such as water lines, electricity grids). Control loops are slightly slower than DCS, but the communication distance is unlimited. <\/p>

DCS, on the other hand, is designed to manage complex and continuous processes under a single roof (refineries, chemical plants). In DCS, controllers are much more tightly integrated into the process, and latency is minimal. If your facility has a critical-speed and high-precision production process, DCS is suitable; if you want to monitor and manage remote points, SCADA is the right solution for you. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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What are the Advantages of SCADA Systems?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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SCADA usage is the greatest aid in achieving operational excellence for a business. Firstly, it minimizes human error by centralizing all processes. It reduces operational costs (OPEX<\/strong>) by decreasing the need to constantly send personnel to the field. <\/p>

Secondly, it dramatically reduces downtime<\/strong>; the system can detect and warn of problems before they occur. Thirdly, analysis of collected data ensures energy efficiency and raw material optimization. This not only reduces costs but also contributes to the business’s sustainability goals by reducing its carbon footprint. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Security in SCADA Systems<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Since SCADA is exposed to the outside world and the internet, cybersecurity is the most critical agenda item in SCADA<\/strong> systems. To protect critical infrastructures, a multi-layered security architecture must be implemented in the system. This means not only using strong passwords but also continuously monitoring network traffic (IDS\/IPS). <\/p>

Access permissions should be defined according to the “principle of least privilege,” ensuring that each user can only access data relevant to their work. Furthermore, encryption of data from the field and firewalls complying with industrial standards (such as ISA\/IEC 62443) are vital. A secure SCADA protects not only data but also the future of the entire facility. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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What Are the Core Components of SCADA Systems?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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SCADA is like a complex orchestra, and each component has its unique role. The harmony between these components determines the system’s stability. Let’s briefly discuss the core components of SCADA systems. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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What is RTU? <\/h3><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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RTU, which stands for Remote Terminal Unit<\/strong>, is a microprocessor-based “remote terminal unit” that bridges physical devices in the field and the central SCADA system. It collects data from sensors, digitizes it, and is typically designed to operate in harsh field conditions (extreme temperatures, dust, humidity). Its long-distance communication capabilities are more advanced than those of PLCs. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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What is a PLC? <\/h3><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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PLC is an abbreviation for Programmable Logic Controller. A PLC is a programmable device used in the control of industrial processes, considered the “brain” of factories. It is known for its fast decision-making ability and high durability. It receives commands from SCADA and stops motors, opens valves, or manages the production line within milliseconds. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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What is HMI? <\/h3><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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HMI (Human Machine Interface) is the visual bridge between humans and machines. These are screens where complex data is presented in the form of graphs, tables, and diagrams (mimic diagrams). Operators monitor the system, issue commands, and manage alarms through this interface. A good HMI directly increases operational speed. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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What is the Importance of SCADA Systems? <\/h3><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tCentralized Management: Enables managing all points, thousands of kilometers away or in different corners of the facility, from a single room.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tReal-Time Monitoring: Allows for quick decision-making and action by instantly observing changes in the process.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tRapid Fault Detection: Shortens repair time (MTTR) by showing where and why a fault occurred within seconds.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tMaximum Efficiency: Prevents waste of energy and labor through data-driven analyses, supporting productivity.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t
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    What are the Differences Between SCADA and PLC? <\/h3><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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    • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tFocus: SCADA focuses on data collection and high-level management\/monitoring; PLC undertakes direct equipment control and execution tasks.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
    • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tStructural Basis: SCADA is a software ecosystem and runs on servers; PLC is a physical hardware operating in the field.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
    • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tScope: SCADA offers a macro perspective covering the entire facility or network, while PLC is a micro structure managing a specific machine or process.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
    • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tData Storage: SCADA can maintain data logs for years, whereas PLCs have limited memory capacity for instantaneous operations.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t
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      SCADA's Role in Industry 4.0 and IoT Integration <\/h3><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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      SCADA is the fundamental data source for digital transformation (Industry 4.0). Traditional SCADA systems no longer just collect data; they are becoming “smart” with Internet of Things (IoT) integration. IoT enables data flow from more devices at a lower cost. <\/p>

      This integration allows the system to transform into “Autonomous Facilities” that can optimize themselves. SCADA, combined with big data analytics, can analyze the facility’s past performance to predict future energy consumption or anticipate when a motor might fail. At Reltek Energy, we see SCADA as the key to this digital future. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t