PLC (Programming Logic Control) is used for automation in different type of industries for increasing prodcutivity, improving quality and reduces maintenance. PLC replaces conventional relay logic control.

About  PLC Training in Gurgaon [Main Unit Gurgaon] ::
PLC main unit was started by G.S. Chaudhary  In Gurgaon In 2006 For Technical  skill Development & Industrial warking   Employees & ITI /Dip/ B Tech Students.

Main parts of PLC (Programmable Logic Controller) : -

	Input
	Output
	Memory
	CPU
	Power supply

PLC have many input terminals through which communicate high and low logical state from switches and sencors. It also has many output terminals also.

• Digital Input – all discrete value signal input are known as digital input. Digital input having two states either ‘OFF’(0) or ‘ON’(1). All switching and sensing devices belongs to digital I/Ps.

Ex: Start PB, Stop PB, Emg Stop, L/S, Pressure S/W, Float Switch, Proximity Sensors, Photo Electric sensors etc.

• High Speed Input – these are similar to digital input only the difference is of switching frequency. If the switching frequency of input is increases to normal sequencly the input elements belongs to high speed input.                                                         

• Analog Input    – All types of value variable signals, continuous value signal elements ormore

than binary status known as analog input.
Ex – Transducer, thermocouple, Photo cell etc.

• Output – Output is the end of any function or instruction it is load type  device.   
  Types : a) Digital                            b)High Speed                             c) Analog

• Digital Output –All types of discrete value signal outputs are known as digital output.                                 

• High Speed Output – these are similar to digital but pulse frequency rate is higher.   

• Analog Output – All types of continuous value signal output belongs to analog output.

• Memory – memory is used for holding the data & backup of data. Memory is the space In software & it is made by memory registers.              

• Memory Capacity – memory capacity depends on total quantity of registers & types of registers.                          

• Memory bit – It is the smallest unit of digital electronics memory bit having binary  status

means two either 0 or 1.

• Memory Registers – Memory registers are made by memory bits. These are also  known as memory parameters.
  Types of Memory Registers :–

• Nibble– 4 Bit register.

Octal (byte) – 8 Bit register.

• Decimal – 10 Bit register                                                                 

• Hex. Decimal – 16 Bit register

             
Types of Memory :–

• RAM – Random Access  Memory 

 It is volatile in nature

• ROM – Read Only Memory

 It is Non – Volatile in nature

• EPROM – Erasable Programmable Read Only Memory  For Removing the data EPROM

Cassette has to be placed in front of ultra violet rays for 15 minutes, the complete data will be washed out. Data can’t be changed at site for changing data EPROM Cassette has taken out from panel & carry it in any lab.

• EEPROM - Electrical Erasable Programmable Read Only Memory It is micro chip  already fixed in card the editing will be done at sight. Its speed is high.
  

• FLASH PROM – Its Speed is faster than EEPROM.              

CPU – Central Processing Unit (CPU)
Microprocessor based, may allow arithmetic operations, logic operators, block memory  
moves, computer interface, local area network, functions, etc. CPU makes a great number of check-ups of the PLC controller itself so eventual errors would be discovered early.CPU replaces contactors, timers, counters of RLC by software.

Power supply -
Most PLC controllers work either at 24 VDC or 220 VAC. Some PLC controllers have electrical supply as a separate module, while small and medium series already contain the supply module. Power supply is used for supplying the diff. supply voltages to diff. PLC sections.

Residual Current Circuit Breaker–(RCCB)

The flow of current through electrical facilities always involves risks. Poorly insulated equipment, faulty wires and incorrect use of an electrical device cause currents to flow through the wrong path (i.e. through the insulation) to the earth. This current is called ‘Leakage Current’. Earth leakage is an electrical hazard and is responsible for electrical shocks and fire risk. Earth leakage and its associated hazard can be prevented by Residual Current Circuit Breaker (RCCB), also popularly known as Earth Leakage Circuit Breaker (ELCB).

WORKING PRINCIPLE(RCCB) – PLC Training in Gurugram
Top Automation Course in Gurugram, Gurgaon

The RCCB works on the current balance principle. The supply conductors, i.e. the phases
and the neutral, are passed through a torroid and form the primary windings of a current transformer. Its secondary winding is connected to a highly sensitive electromagnetic trip relay, which operates the trip mechanism. In a healthy circuit, sum of the currents in phases, is equal to the current in the neutral and the vector sum of all currents is equal to zero. If there is any insulation fault in the current and leakage current flows to earth, the currents do not balance and their vector sum is not equal to zero. This imbalance is detected by the core balanced current transformer, the RCCB is tripped and supply to load is interrupted. The trip mechanism is operated at a residual current between 50-100% of its rated tripping current.