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PLC : prgrammable logic controller
SCADA : supervisory control and data aquisition
PLC you can say it is the controller that can give you the abilty to make your control program and excute it by using its I/O without any supervision
But to make supervision you need to use the plc with scada program and pc screen and make your system with one or more Plc units Using communication techniques
There is also HMI Human Mchine Interface
As toutch screen that give you a limited abilty
To supervise and control your system throgh
The main difference between PLC & SCADA is their function and how they execute it.
PLC is essentially a hardware based system. It is nothing but a computer designed for one specific task of reading field instruments and controlling actuators, motors etc based on what program is written in it.
SCADA is essential a piece of software that is installed on a PC/computer. One of its major functions is to act as Human Machine Interface (HMI).
Using industrial communication networks, like Modbus, the SCADA can be hooked to, usually, a PLC using software drivers that read data in a prescribed format over serial or Ethernet.
This data is used by the SCADA for different functions like, display & control from HMI, historical record of process functions, reports etc.
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