Answer / mathan

proportional -it is the present error and it can be adjusted by gain.
integration - past error and can be adjusted by resetting functions
derivatives - future error and can be calculated by rate of change of time

Answer / carl_ellis

PID provides a modulated output response to an error signal,
where error is the difference between what you want, the
setpoint, and what you have, the process variable.

PID uses an output response proportional to the input span
(P = proportional), modified by the accumulated error over
time (I = integral) and modified by the rate-of-change of
the error (D=derivative).

Carl Ellis
Measure First

what is INSTRUMENTATION ? specify..

7 Answers   Reddy Labs,

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what is difference between modbus & fieldbus

1 Answers   ABB,

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What is Integral and Derivative control?

5 Answers   Qatar Petroleums,

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PT RTD Range: -200 to 500 degree celsius If I configured in DCS Lower range and Upper range . In face plate it shows red colour due to overa range how was the characteristics look If the temperature is more than operating range. how was the characteristics look . whether its in Resistance vs Temperature curve is Linear or Non linear

0 Answers   MSL, SRAAC,

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in i/o panel for digital ouput(do) how much power(in volts) we must give?

2 Answers  

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can u briefly explain aboutan aryton shunt multirange DC ammeter?

0 Answers  

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1 Answers  

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Why we are using 4-20 mA as Analog signal transmission other than 3 to 19 or 2 to 18 or 6 to 22 like wise ? What is the reason behind using 4 & 20 mA? Can anyone give proper technical reply ?

5 Answers   Air Liquide,

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what is the reason while warning lamp is on while the engine is cranking?

0 Answers   Jindal,

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what do u mean by 2/3 soleniod valves?

8 Answers   Nile Sugar,

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Y to use 4 to 20ma instead of 0-10v

5 Answers  

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1. what is 3 point calibration & 5 point calibration? 2. If we use hart communicator to set the LRV & URV of a smart transmitter, did we calibrate the transmitter? why? 3. Make a complet list if meterials needed to properly connect a pressure gauge to a steam pipe using 1/2 inch stainless steel tubing. The gauge connections is 1/2 inch NPT-M and the steam pipe tap has a 1/2 inch female coupling, compression fittings are use. 4. What are the tools in loop checking? 5. What would the ISA symbol of a square root extractor look like? 6. What would you do to completely prepare for the configuration? 7. What safety measures must you undertake when doing configuration? 8. what are the two most commonly use programming languages used when we configure a PLC? 9. What would you do if you accidentally skipped a step in the configuration procedure? 10. How would you know if the configuration were sucessful? 11. Name at least 3 selections available when we configure the burnout protection of a controller?

3 Answers   EI Electrotechnical Institute,

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