SCADA Network Hardware Architecture
In general, a SCADA system can be divided into two general parts.
Clint Layer: This layer creates the connection between man and machine.
Data Server Layer: This layer is responsible for most data processing activities.
SCADA Station refers to the server and, as we said, sometimes consists of just one PC.
The data server communicates with field devices such as PLCs and RTUs. PLCs are connected to the data server either directly or through the network and bus.
The SCADA system uses a WAN or LAN network, which consists of Internet protocols and is used to communicate between the master station and the devices.
Physical devices such as sensors are connected to RTUs and PLCs.
RTU converts sensor signals into digital data and transmits digital data to the master.
Based on the feedback command received from the master by the RTU, an electrical signal is sent to the relays and motors.
Many status control and monitoring operations are performed by RTU and PLC. The image below shows a hardware connection to the SCADA system.
Software architecture
Many servers use multitasking as well as real-time databases.
Servers are actually responsible for collecting and managing data.
A SCADA system consists of a software program that provides management information and diagnostic data such as a regular maintenance process, logical information, detailed schematics for a particular sensor or machine, and a system troubleshooting guide.
This means that the operator can see a schematic representation of the controlled plant.
The advantage of the SCADA system
The SCADA system is able to display the process set information graphically on the display.
The SCADA system can be easily expanded.
If necessary, a set of control units and sensors can be added to a SCADA system and upgraded.
The SCADA system is suitable for operation in critical situations.
SCADA Part 4: SCADA Network Hardware Architecture
SCADA Part 3: SCADA Telecommunications and infrastructure
SCADA Part 2: SCADA system hardware
SCADA Part 1: The concept of the SCADA system
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