Scada

In this blog we will be learning about Scada, Scada system in industry, working principle of PLC and so many things. I learned these things from on the work shop of Line academy which was very fruitful.

SCADA AND PLC

fields of engineering

electrical=== operation of sensor, pumps
electronics === communication of 2 separate device
computer === 3rd party company application ,add some scripts
mechanical === pump , valve and other mechanical design

who implements

oils and gas

steel industry

water treatment

food productions industries

electric generations , transmission and distributions system

SCADA stands for supervisory control and data Acquisition

it is simply a system of software and hardware elements which allows industries to control and monitor all the process that takes place in the real time operations

Different company have different scada

evolution of Scada

early industries implemented selector switches, Push buttons, analog measurement devices for control and supervision. There must be at least someone for 4 hours for supervision

with time they were replaced by relays , circuit breakers and timers

In late 70's SCADA and PLC were starting to replace all the traditional was of control and supervision

Form serial communication to ethernet connection and today at present we have cloud based and web based control and supervision.

SCADA usage

Process control system and safety system
monitor , gather and process real time data
Directly interact with device such as sensors, values , pumps, motors and more
record events into a log file

Scada server

server is a computer hardware or software that provides data to other computer and device
serve data to system on LAN or WAN over the internet and through serial connections for serial devices
the management of data on server is done by using language like SQL
sql commands like "select","insert", "update","delete", "create" and "drop" are used to manage the server data.

communication interface

medium through which the device and servers installed in the industry and can share data and information between each other

ethernet, RS232, RS485. Profitbus, DH+ are some of the ways the devices communication with each other

each communication medium have their own protocols for operations , TCP IP is a simple example for protocol used in ether net communication

MODBUS is a widely used protocol in industrial Automation

Field device

pumps, VFD(variable frequency drive), sensors, Relay switches, Valve

HMI

human machine interface is a user interface or dashboard that connects a person to a machine, system or device

they can be a panel view or a monitor screen of a computer

it is used by the operator , Engineers and the supervisor

HMI are essential resource for operators who