if the t/c o/p is 4-20mv then how plc recognize it because we are dealing with

Categories >> Engineering >> Instrumentation
Suggest New Category

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 ????????????????

Question Posted / only

7 Answers
9151 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

if the t/c o/p is 4-20mv then how plc recognize it because we are dealing with the 4-20ma in the ..

Answer / 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

if the t/c o/p is 4-20mv then how plc recognize it because we are dealing with the 4-20ma in the ..

Answer / biswarup das

There is different module in a PLC . Out of which one is T/C
module if you connect the o/p of T/C directly to this module
of PLC , then the PLC will recognise it.

T/C module is not inbuilt we have to select it seperately.
There are many modules like this such as RTD module, 0-10
volt module etc.

Is This Answer Correct ?

5 Yes

0 No

if the t/c o/p is 4-20mv then how plc recognize it because we are dealing with the 4-20ma in the ..

Answer / altamash

In plc, there is a separate I/O MODULE FOR T/C which already have inbuit converter so we dont have to worry on this,First we have to know complete module of plc.thanx

Is This Answer Correct ?

2 Yes

0 No

if the t/c o/p is 4-20mv then how plc recognize it because we are dealing with the 4-20ma in the ..

Answer / guest

we will convert mV in to the ma....by connecting resistance
in parallel

Is This Answer Correct ?

5 Yes

4 No

if the t/c o/p is 4-20mv then how plc recognize it because we are dealing with the 4-20ma in the ..

Answer / kishore

There will be a Convector for mv to ma what ever the
temperature Sens by the t/c that will convert to the ma and
signal goes to DCS.

Is This Answer Correct ?

1 Yes

0 No

if the t/c o/p is 4-20mv then how plc recognize it because we are dealing with the 4-20ma in the ..

Answer / sattar

Voltage to current converter using op-amp

Is This Answer Correct ?

0 Yes

0 No

if the t/c o/p is 4-20mv then how plc recognize it because we are dealing with the 4-20ma in the ..

Answer / sreekanth

standard thermocouple output is 0 to 10 mV. There will be 4-
20MA converter either in DCS in the field(Transmitter)as
the modules will accept only 4-20 MA output.

Is This Answer Correct ?

1 Yes

5 No

Post New Answer

More Instrumentation Interview Questions

Whether the DI, DOs shields can be connected with Analog Input Shield Earthpit?

0 Answers

what is interface level and how it is calibrate?

0 Answers

Introduce yourself which is not present in your biodata?

0 Answers GAIL,

Good evening all I need a small favour regarding reliance paper i wanna probable sample papers(e&i) of reliance. if any of u have any idea about dis then plz mail me back.i belongs to electronics and instrumentation engg.so i need e&i papers. thanking u....

0 Answers

which instrument is used to study the structure of phloem and xylem tissue?

1 Answers

how i can copy paste the program of smart transmitter to another smart one with hart communicator?

2 Answers KOC,

what step is taken for ESD ( emergency shut down) in DCS REPLY to hashimka20009@gmail.com

0 Answers Bosch, Eskom, Sabic,

What is the difference between intrinsic instruments and ATEX instruments?

1 Answers

How to convertion 100 m3/hr to mmH2O or to Kg/cm2?

0 Answers

Where Can i take a SPI INtools training in Mumbai? In Rolta India Ltd to whom I should approach regarding of SPI INtools Training?