Components of SCADA System

Components of a SCADA SystemA SCADA system is composed of the following :
1. Field Instrumentation
2. Remote Stations
3. Communications Network
4. Central Monitoring Station

Components of SCADA System

Field Instrumentation refers to the sensors and actuators that are directly interfaced to the plant or equipment. They generate the analog and digital signals that will be monitored by the Remote Station. Signals are also conditioned to make sure they are compatible with the inputs/outputs of the RTU or PLC at the Remote Station.

The Remote Station is installed at the remote plant or equipment being monitored and controlled by the central host computer. This can be a Remote Terminal Unit (RTU) or a Programmable Logic Controller (PLC).

The Communications Network is the medium for transferring information from one location to another. This can be via telephone line, radio or cable.

The Central Monitoring Station (CMS) refers to the location of the master or host computer. Several workstation may be configured on the CMS, if necessary. It uses a Man Machine Interface (MMI) program to monitor various types data needed for the operation. The following is a sample configuration of a SCADA system for water distribution.

SCADA System for Water Distribution

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