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Posted on : Monday 10th August 2020 10:52 AM

PLC and SCADA


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Posted by  YK Wong
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SCADA

SCADA is used to monitor and run plant processes. It’s typically software installed on a computer and one of its major functions is to act as an interface with industrial machines( or Human Machine Interface or HMI) It often used in conjunction with PLCs and other devices. 

PLC (Programmable Logic Controller)


PLC designed to control complex industrial processes running machines and motors. It simply program and fully scalable to an operation’s requirements. It also used to collect data from system they control. It can upgrade over the old relays and timers previously used to control industrial machinery since PLCs are capable of performing much more complex tasks.

What is the different between SCADA and PLC?

Used together, SCADA software and PLCs from an automatic system for prescribing maintenance tasks, forming the core of a predictive maintenance program. It works something like this.

- Data from sensors on individual assets is transmitted to the PLC

- The PLC translates that data into a format that can be used by the software

- User access the data through the HMI on the software

- If the data crosses certain thresholds, a maintenance work order is created



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