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

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..

Answer / bm

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

What is critcal speed. what is resonant frequency. why we want to cross crtcal speed on higher RPM (early).

0 Answers  


What is protocol ?

3 Answers  


How INtools is useful for routine Instrument maintenance?

0 Answers  


what is loop1 and loop2 in MTS LT?

0 Answers   SPGC,


why we use 24 vdc in instruments mostly?

2 Answers  






what is dedband in instrumentation ?

3 Answers  


What is cavitation. what is the effect of it on control valve and how is it prevented.

1 Answers   ADMA OPCO,


IS IT POSSIBLE TO CALIBRATE A LEVEL TRANSMITTER INDICATOR(ABB) USING HART COMMUNICATOR.? I MEAN TO CHANGE FROM ONE UNIT TO ANOTHER WITHIN INDICATOR (EG. INCH TO FEET)...? PLZ NOTE THAT I HAVE MADE THE UNIT CHANGE IN TRANSMITTER USING HART COMMUNICATOR..BUT WHAT ABOUT THE INDICATOR..?

2 Answers  


Why 1-5 vdc a standard?

1 Answers   Process Control Technologies,


how will you check torque value during Factory acceptance Test for control valve/ESD ON/OFF VALE how will you confirm this torque value is being correct, Which document will you be refer.

0 Answers  


what is the difference between magnetic flow meter and mass flowmeter

0 Answers  


what is the difference between SCADA and DCS?

5 Answers   ACC,


Categories
  • Civil Engineering Interview Questions Civil Engineering (5084)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4451)
  • Electrical Engineering Interview Questions Electrical Engineering (16631)
  • Electronics Communications Interview Questions Electronics Communications (3918)
  • Chemical Engineering Interview Questions Chemical Engineering (1094)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (239)
  • Bio Engineering Interview Questions Bio Engineering (96)
  • Metallurgy Interview Questions Metallurgy (361)
  • Industrial Engineering Interview Questions Industrial Engineering (259)
  • Instrumentation Interview Questions Instrumentation (3014)
  • Automobile Engineering Interview Questions Automobile Engineering (332)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (97)
  • Marine Engineering Interview Questions Marine Engineering (124)
  • Power Plant Engineering Interview Questions Power Plant Engineering (172)
  • Textile Engineering Interview Questions Textile Engineering (575)
  • Production Engineering Interview Questions Production Engineering (25)
  • Satellite Systems Engineering Interview Questions Satellite Systems Engineering (106)
  • Engineering AllOther Interview Questions Engineering AllOther (1379)