PLC & SCADA
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31-12-2010, 02:34 PM


Submitted By: RAJESH KUMAR

Submitted To: LOKESH KUMAR
(HOD)



.pptx   RAJ.pptx (Size: 337.57 KB / Downloads: 99)


AUTOMATION

Automation or industrial automation is the use of control systems such as computers to control industrial machinery and processes, reducing the need for human intervention, in order to increase reliability and efficiency.
It restricts a person from doing a job which can be monotonous if repeated again and again thereby decreasing the efficiency of his work and thus decreasing the efficiency of the industry as a whole. Thus , with automation that same work is performed with more accuracy and efficiency.


INPUTS
Switches
Pushbuttons
Pressure Switches
Level Switches
Temperature Switches
Vacuum Switches
Float Switches
Limit Switches
Condition Sensors
Encoders
Photoelectric Sensors
Proximity Sensors

OUTPUTS

Valves
Motor Starters
Solenoids
Actuators
Horns and Alarms
Stack lights
Control Relays
Counter
Pumps
Printers
Fans
Light Emitting Diodes (LED)

PROGRAMMABLE LOGIC CONTROLLER
A PROGRAMMABLE LOGIC CONTROLLER (PLC) is an industrial computer control system that continuously monitors the state of input devices and makes decisions based upon a custom program to control the state of output devices.
The biggest benefit in using a PLC is the ability to change and replicate the operation or process while collecting and communicating vital information.
Another advantage of a PLC system is that it is modular. That is, you can mix and match the types of Input and Output devices to best suit your application

CONTACTORS

A contactor is an electro-magnetic switching device used for remotely switching a power or control circuit. A contactor is activated by a control input which is a lower voltage / current than that at which the contactor is switching. Unlike a circuit breaker a contactor is not intended to interrupt a short circuit current.
Contactors are used to control electric motors, lighting, heating, capacitor banks, and other electrical loads.

PROXIMITY SENSORS
A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact. The object being sensed is often referred to as the proximity sensor's target. Different proximity sensor targets demand different sensors. For example, a capacitive or photoelectric sensor might be suitable for a plastic target; an inductive proximity sensor requires a metal target.
The maximum distance that this sensor can detect is defined "nominal range". Proximity sensors can have a high reliability and long functional life because of the absence of mechanical parts and lack of physical contact between sensor and the sensed object.









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