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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
PLC:
Programmable Logic Controller , it is a Industrial Computer (It is a hardware)that performs discrete or sequential logic in a company environment.
It was originally developed to replace mechanical relays, timers, counters.
PLC are used successfully to execute complicated control operations in a plant.
It is a controlling device that controls output process through logic programs given to it.
Examples of some important brand PLCs are; Allen Bradely, Siemens, Omron etc
SCADA:
Supervisory Control and Data Acquisition :
It is a monitoring and controlling software, runs on PC and is generally connected to varies PLCs and other peripheral devices.
Examples of SCADA Software used in industries are; R.S View, Wonderware, Win CC.
In basic SCADA architectures, information from sensors or manual inputs are sent to PLCs (programmable logic controllers) or RTUs (remote terminal units), which then send that information to computers with SCADA software. SCADA software analyzes and displays the data in order to help operators and other workers to reduce waste and improve efficiency in the manufacturing process.
In a simple way, we say that PLC is hardware part and SCADA is software part. PLC (Programmable Logic Control/Controller) is an industrial type dedicated computer fed with commands and algorithm in a systematic way to control a specific operation in a precise manner. SCADA (Supervisory Control and Data Accquisition) it is a realtime monitering software which will be connected to PLC or DCS.
plc is a programing device and and scada is a monitoring software..
PLC is hardware device, which collects field data from various sensors, store (48 -72 hours data buffer) , do simple calculations and logic conversions, which is sent after vie communication media (fiberoptic, wirless, LTE) to the SCADA. SCADA consist SCADA server and engineering and end-user workstations. SCADA server is collecting data from multiple PLC/Controllers. Data is stored for prolonged periods in inbuilt Histrian and distributed to end-user Pc via HMI.
PLC is programmable logic control system used for few operation of measuring and controlling and interlocking between sesors and switches,
SCADA is supervisory control and data acquisition can monitor and control different devices in single place
PLC is a Hardware to read the sensor (physical signal) , solve the algorithm and gives the controlled output., whereas SCADA is the software which can be interfaced to PLC, to read and present the information in graphical, animated form or make log. For example:Controlling the LEVEL is done by PLC and info graphics of the level with information about it (level, criticle levels, alamrs etc.) from last 3 years or more is done by SCADA.
PLC is a Hardware to read the sensor (physical signal) , solve the algorithm and gives the controlled output. SCADA is interfaced with PLC to read information
PLC is a programmable Logic controller which is used mainly for interlocking different equipments. DCS is Distributed Control Systems which is used to control very big plants by using simple GUI screens.PLCs are interfaced with DCS for interlocking.May 30, 2014
