What is the PLC Level & type.
- 2 Answers
- 12093 Views
- Bhushan Power Steel, I also Faced
- E-Mail Answers
Answer Posted / md.nayeemuddin
A programmable logic controller (PLC) or programmable
controller is a digital computer used for automation of
electromechanical processes, such as control of machinery on
factory assembly lines, amusement rides, or light fixtures.
PLCs are used in many industries and machines. Unlike
general-purpose computers, the PLC is designed for multiple
inputs and output arrangements, extended temperature ranges,
immunity to electrical noise, and resistance to vibration
and impact. Programs to control machine operation are
typically stored in battery-backed-up or non-volatile
memory.
As an example, say a facility needs to
store water in a tank. The water is drawn from the tank by
another system, as needed, and our example system must
manage the water level in the tank.
Using only digital signals, the PLC has two digital inputs
from float switches (Low Level and High Level). When the
water level is above the switch it closes a contact and
passes a signal to an input. The PLC uses a digital output
to open and close the inlet valve into the tank.
When the water level drops enough so that the Low Level
float switch is off (down), the PLC will open the valve to
let more water in. Once the water level rises enough so that
the High Level switch is on (up), the PLC will shut the
inlet to stop the water from overflowing. This rung is an
example of seal-in (latching) logic. The output is sealed in
until some condition breaks the circuit.
| |
| Low Level High Level Fill Valve |
|------[/]------|------[/]----------------------(OUT)---------|
| | |
| | |
| | |
| Fill Valve | |
|------[ ]------| |
| |
| |
An analog system might use a water
pressure sensor or a load cell, and an adjustable
(throttled) control (e.g. by a valve) of the fill of the tank.
| Is This Answer Correct ? | 3 Yes | 5 No |
Post New Answer View All Answers
What is the use of single seated valve?
how to change measuring units from mmwc to cubm/h in rosemount air flow transmitter with hart communicator fluke 744
Can any body help to get Rsemulator 5000 free from internet if possible then give me any link or any help .
what is use of communication wire in multipare cable(oil and gas field), why this communication wire not used in single pair cable?
control panel design guidelines
my data card only does run in my mobile so how can change it that it run other mobile & computer and i can stor data in my data card
what is diffrance between FF & SMART, explain with difination
please send me the inteview questions in IOCL
What are the maximum packet size of: a) HART b) Profibus DP c)Profibus PA d) DeviceNet e) Foundation Fieldbus
how to calibrate 0- 150 psi presure gauge by dead weght tester
how many maximum enter 2mm Dia solid cylindrical pipe into 8mm Dia hollow cylindrical pipe. give answer with calculation.
what is Best Among SINK Or SOURCE Type Design In Digital Signal, Either Iput Or Output? WHY?Can any one..
what is zero and span ?
Why trim span ? How?
A flange is used for instrument connection for a system with a design temperature of 316C (600F) and a design pressure of 1000 kPa (145 psi). What is the class rating of the flange to be used for this application? Explain your answer
