why the SCAN time of DCS is more & that of PLC is less? if the SCAN time of

why the SCAN time of DCS is more & that of PLC is less?
if the SCAN time of DCS then why we use DCS.

Question Posted / gaurav.r.kale@gmail.com

4 Answers
14701 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

why the SCAN time of DCS is more & that of PLC is less? if the SCAN time of DCS then why we use..

Scan time of DCS is more than the scan time of PLC when the
I/O's are digital.
Whereas the scan time of DCS is less than the scan time of
PLC when the I/O's are analog.
Hence DCS is better when analog signals are considered
whereas PLC is better when digital signals are considered.
However DCS do handle both analog and digital signals. It
can also have more no. of I/O's compared to PLC. Hence we
use DCS.

Is This Answer Correct ?

33 Yes

7 No

why the SCAN time of DCS is more & that of PLC is less? if the SCAN time of DCS then why we use..

Answer / kyle condran

DCS are not PC based. the configuration and operating software are but the actual control happens in a control module. DCS usually have a fixed scan time 50ms+, but not always, regardless of I/O count or program size.

PLC scan time depends on Program size and I/O used in the program.

Is This Answer Correct ?

5 Yes

0 No

why the SCAN time of DCS is more & that of PLC is less? if the SCAN time of DCS then why we use..

Answer / solomon

Eventhough PLC scan time is less,DCS is selected for its
I/O availability.About 1 lakh I/O available in DCS.

Is This Answer Correct ?

11 Yes

10 No

why the SCAN time of DCS is more & that of PLC is less? if the SCAN time of DCS then why we use..

Answer / k.k.rameshkumar

DCS is pc based system. The speed of the processor/CPU
decides the scan time.

Is This Answer Correct ?

3 Yes

28 No

Post New Answer

More Instrumentation Interview Questions

Explain the key components of control loop?

0 Answers

WHAT IS DIFFERANCE BETWEEN INSTRUMENT AND EQUIPMENT

1 Answers Lupin,

what is hart communicater? can u give brief explanation about this issue?

3 Answers

Can any one send me IOCL instrumentation question papers.. i dont know the pattern of the questions and what to prepare can any one help me on this .. my email id is anwarnishil@gmail.com

0 Answers

Explain signal isolator

0 Answers

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

0 Answers

explain key exchanges in all security modes WPA,WPA2,TLS?

0 Answers

why we use 24v dc in instrument rahter than 230vac????

4 Answers

what is Potential free contact? where it is used?

3 Answers Engineers India Limited,

how to calibrate transmitter online (in running plant)please explain correct procedure