PLC, SCADA, and DCS Functions

Develop your Skills with Industry-leading Brand Tools and Technology

PLC -> Allan-Bradley, Siemens, ABB, Schneider Electric, Mitsubishi, Fuji Electric, Omran, Delta

SCADA -> Factory Talk, WinCC, InTouch, AVEVA

HMI -> Allen-Bradley, Siemens, ABB, Delta

VFD -> Allen-Bradley, Siemens, ABB, Schneider Electric, Delta

PAC -> Compact Logix, Control Logix

DCS -> Yokogawa, ABB

PLC (Programmable Logic Controller)

– Monitors and controls industrial processes

– Executes programmed instructions (ladder logic, function block, etc.)

– Inputs: sensors, switches, and other devices

– Outputs: actuators, valves, motors, and other devices

– Functions:

    – Logic control

    – Sequencing

    – Timing

    – Counting

    – Data processing

SCADA (Supervisory Control and Data Acquisition)

– Monitors and controls industrial processes remotely

– Collects data from PLCs, RTUs, and other devices

– Displays data in real-time (HMI, graphics, trends, etc.)

– Functions:

    – Data acquisition

    – Monitoring

    – Control

    – Alarm management

    – Reporting

DCS (Distributed Control System)

– Controls and monitors industrial processes in real-time

– Decentralized architecture (multiple controllers, workstations, etc.)

– Functions:

    – Process control

    – Monitoring

    – Optimization

    – Data management

    – Integration with other systems (SCADA, ERP, etc.)

In summary:

– PLCs execute local control logic and interact with field devices.

– SCADA systems monitor and control processes remotely, focusing on data acquisition and visualization.

– DCSs provide real-time control and monitoring, often integrating with SCADA and other systems.