November 19, 2018

What is PLC?.


What is PLC?.
A  PLC (PROGRAMMABLE LOGIC CONTROLLER) may be a solid state system that unceasingly monitors the standing of devices connected as inputs.

Based on a user program, hold on in memory, it controls the standing of devices connected as outputs.

A digital device that uses a programmable memory to store directions and to implement specific functions such as logic, sequence, timing, count and arithmetic to manage machines and method.

It uses a programmable memory to store the directions and specific functions that embody On/Off management, temporal order count, sequencing, arithmetic and knowledge handling.

A PLC may be a pc designed to figure in Associate in nursing industrial atmosphere.

What is CPU?


What is CPU?

CPU is the brain of the PLC

It is controlled by the program called the operating system or OS.

And the execution is the collection of the program which is stored in the memory.

Duties of the CPU?

Duties of the CPU?

The CPU reads the inputs and processes the control program and controls the outputs as per program.

CPU provides internal memory, timers and counters and other instruction set.

Commands connected outputs can be controlled based on program. For examples light, fan etc.

Inputs examples for the PLC

Inputs examples for the PLC

Switches and Pushbuttons
Sensing Devices
Limit Switches
Photoelectric Sensors
Proximity Sensors
Condition Sensors
Pressure Switches
Level Switches
Temperature Switches
Vacuum Switches
Float Switches
Encoders

October 30, 2018

Outputs examples for the PLC


Outputs examples for the PLC
Valves
Motor Starters
Solenoids
Actuators
Control Relays
Horns & Alarms
Stack Lights
Fans
Counter
Pumps
Printers

October 26, 2018

Power supply for the PLC

Power supply for the PLC

A power supply is needed to provide power to the PLC and any other
Modules in the panel.

Power supplies come in various forms:
Power supply
External power supply
Standalone power supply

October 19, 2018

List of items required when working with PLC.

List of items required when working with PLC.

Programming device (laptops or PC).

PLC software .PLC manufactures have their own software for programming.
Communication cable

Back up copy of the ladder program.

Documentation (ladder program, operation manuals etc. and drawing.

PLC advantages and disadvantages

PLC advantages.

It can handle much more instructions.
Less and simple wiring
More flexibility.
Lower cost
Faster response
Easier troubleshoot
Remote control capability.
Communication capability.

PLC disadvantages.
Most PLCs makers supply solely closed architectures for his or her product.

PLC were designed for relay logic.
To maximize PLC performance and adaptability, variety of elective Modules should be other

October 1, 2018

Two Way Switch Logic

PLC Program for Two Way Switch Logic

Two ways light logic often used in staircase.Learn how to write PLC program for this light control logic in home or building.

Click on image for more detail