Interested to Buy Any Domain ? << Click Here >> for more details...
if the t/c o/p is 4-20mv then how plc recognize it
because we are dealing with the 4-20ma in the
plc ????????????????
- 7 Answers
- 11331 Views
- I also Faced
- E-Mail Answers
Answer Posted / arindam
why we require a 4-20 mamp for transmission? the main reason
behind it because of electro magnetic interference the
voltage can get interfered very easily and we can't get our
desired o/p value.when we are using 4-20 mamp this problem
is solved but since, PLC is a digital device it can
understand mainly High=5V or low so we design the sink to
have a resistance as high to get the desired voltage, the 4
mamp is also helpful to power the electronics at the
transmitter end. to have a 4-20 mv instead can firstly :
cause em interference and secondly we need to have a
continuous level monitoring for different voltages...which
can increase the size of PLC . Also because of change of
impedance at the transmission line the voltage can drop
below 4 volt ocassionaly then loop powering of field
instrument will not be possible.
| Is This Answer Correct ? | 5 Yes | 0 No |
Post New Answer View All Answers
How an rtd work, and what volts/current goes to a rtd to measure the resistance?
What is the right procedure for adjusting the gap voltage of bently nevada vibration sensor?
Sir,I am going to sit for IOCL written test exam. recently.Can anyone tell me the name of 'Objective type Question Book on Instrumentation Engineering ' which will help me. Pl. mail to bidyut_71@rediffmail.com / bidyut.saha2008@indiatimes.com / bidyut.saha09@yahoo.in
What is super thermocoupal?
in differential pressure transmitter,min&max pressure range for hp&lp
Emergency Shutdown Systems/ Plant Shutdown System.
Which type of pressure can be measured by primary elements?
what happen if i increase height of displacer type LT.accuracy or sensitivity are affected.why?
SOME OF YOUR QUESTIONS ARE NOT MAKING ANY SENSE SO TRY AND PUT IN A LITTLE BIT MORE EFFORT BEFORE YOU POST A QUESTION. WE WILL ONLY HELP THOSE WHO WE CAN SEE ARE TRYING TO HELP THEMSELVES.
Make Heater Process Logic.
How do bending tubing provide better measurement than using tubing fittings such as elbows?
How will you calibrate an Absolute Pr.Transmitter of range 400mmHg absolute ?
Whether the DI, DOs shields can be connected with Analog Input Shield Earthpit?
What is the formula of vabration sesore. i mean how to covert mils to volt plz share if any body knows very argent : my mai is merajalam143545@yahoo.com
hii my name is sujith...i am preparing for HPVL GET 2010... so ,,,pls help me by send any previous questions or material to my site.....(Msujith_12@in.com) thank q
