IoT comes from sensor network concept. Actually, the main goal of it is to standardize sensor network and also data gathering and aggregation frameworks.
Hence the first idea behind it was to measurement and mining of data. However, Scada is an automation and control networking framework which the main concern is to control the actuator network and of course to measure physical parameters for control.
Hence IoT doesn’t address the Scada real-time and reliable network needes for industrial control. However industrial IoT focused on QoS constraints of a real industrial network however it still doesn’t include controller builtin. IIoT cane is used as a network infrastructure for Scada.
SCADA (supervisory control and data acquisition) is a system that monitors and control industrial, infrastructure, and facility-based processes that exist in the physical world.
SCADA usually refers to centralized systems, different of the decentralized nature of the Internet of Things elements. It can, however, be applied to SCADA as data acquisition/actuator nodes, as long as it provides security and accuracy required by SCADA standards.
IoT is complimentary to SCADA and DCS. Information generated from SCADA systems acts as one of the data sources for IoT. SCADA’s focus is on monitoring and control. IoT’s focus is firmly on analyzing machine data to improve your productivity and impact your top line
Metadata driven architecture. You can connect anything: machines, vehicles, bar code readers, solar panels, weather stations and have the ability to process data across all these sources together.
The ability to do real time complex stream processing of data from multiple sources .
The ability to analyze large amounts of machine data. The ability to apply modern supervised and unsupervised machine learning algorithms to predict outcomes.( machine learning)
Built with the cloud in mind and provides flexible, affordable pay-as-you go plans. Systems that provide the ability go go private when the situation demands.SCADA does not.
IoT is the advance of SCADA (or [web SCADA], where you get to bring your system to the cloud and have them communicate with each other. IoT stands for Internet of Things, when it is used for industrial purpose, it shall be called as IIoT (Industrial Internet of Things). Normally people compared SCADA with IIoT, instead of IoT.
As previous answers given, IIoT has all SCADA’s function. In other words, IIoT is SCADA with extra features, i.e. communication between the whole system via network, where all the system devices can collect/exchange data with each other. Of course, these data can then be analyzed and processed like what SCADA does.
Hence, IIoT is the advance of SCADA, which communication and connectivity between all “Things” are the focus.
SCADA is more about machine to machine control by acquiring the necessary data from the machines through the field level devices such as sensors and actuators and it uses PLC as their controller.
IoT on the other hand includes every function SCADA has. IoT is more about collecting and analysing the data. It’s also used in many Automation industries along with SCADA to help in coordination of work by supporting each system with the necessary data, so that they run together as a whole system.
P.s: If IoT is implemented in industries, they were termed as IIoT ( Industrial Internet of Things), but nowadays, it’s IoE ( Internet of Everything )
