********** Knowledge Area Made by Mahabub ***********: February 2018

Tuesday, February 6, 2018

Applications:
1. Presence detection
2. Building automation
3. Alarm and Security system
4. Contactless hygienic switch for toilet.

PIR Sensor

Monday, February 5, 2018

The disadvantages are.....1. Power loss
2. Unacceptable noise
3. It causes radio interference.

Basic Impulse Level (BIL) refer to the peak value of lightning impuse voltage withstand capability of the equipment

Creepage distance is the shortest distance between two conducting points along the surface of the insulating material.

Advantages of Programmable Logic Controllers (PLCs) are they can be used for general purpose can easily set for verity of functions.
Some of the advantages of PLCs over RTUs are: PLCs are reliable, cheap, flexible compared to RTUs, sophisticated control and troubleshooting in PLC is easier.

Microprocessor: To carryout arithmetic and logical operations

Memory: The area in the CPU in which the information is stored and retrieved from.

Power Supply: The electrical supply that converts the ac voltage to various DC operating voltages.

The sequential operation of the controller that goes through the ladder diagram from top to bottom of the ladder.
In this process it updates all the outputs corresponding to the inputs.
SCAN takes place from left to right of each rung.
Usually SCAN time is in milliseconds and it is a continuous process.

1. Input interface
2. Central Processing Unite
3. Memory section.
4. Programming tools
5. Output Interface.

Knowledge Area Made by Mahabub *