Answer / murali iroyal

A programmable logic controller(PLC)is a electronic device
or i can say it as a controller to make program for machine
to operate in lay-man language,

Using PLC you can make machine automatic and run the machine
asper your requirement

Answer / m.umer irshad

a PLC is a Controller and a electronic device thats perform
according to instrunctions saved in their memory to perform
the specific tasks.

Answer / khomotso

It Operates, more like microcontrollers but the configuration are way too different. It make use of logic zero and logic one for automatic control and for complex operation, some sensors, relays, timers, counters... etc are installed as part of the process control to obtain desired outputs

Examples. Boom gate, traffic lights,

I HAVE GOT TYPICAL PROBLEM WITH THE TEMP.INDICATION. THE PROBLEM IS THE K-TYPE T/COUPLE OUT PUT IS CONNECTED TO A INDICATOR.THE INDICATION FLUCTUATES SOME TIMES AND SOME TIME IT IS STABLE. WHEN I CHECKED OUT PUT OF T/COUPLE THE MV WILL NOT VARY. WHERE AS INDICATION FLUCTUATES. WHEN I GIVE MV SOURCE TO T/COUPLE EXTENSIONCABLE FROM THE FIELD IT INDICATION IS STABLE. WHEN GIVE MV SORCE TO INDICATOR ITS INDICATION IS STABLE. PLEASE CLARIFY.

5 Answers  

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Watt is Wrms define rms?

2 Answers  

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Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =

0 Answers  

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why would you like to join our company

0 Answers   Aramco,

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find the kp ki kd from the transper function G(S)=29.44s+04707/1.5349s2+s

0 Answers  

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I am having a Phoenix digital to modbus converter. The o/p of the same is connected to flow computer FB407. But the digital signals are updated only after one minute in the flow computer. what may be the cause of delay in communication? Flow computer is having a scanning period of less than 1 sec.

0 Answers  

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HOW WE ARE DECIDING WHILE PROGRAMMING IN PID CONTROLLER THAT WE ARE USING HEATING OR COOLING???????

1 Answers   Eskom,

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How Honeywell FSC is functioning and what is its purpose? Can we bypasa it and only use DCS instead of that.

3 Answers  

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what is Potential free contact? where it is used?

3 Answers   Engineers India Limited,

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Dear Sir/Madam,im going to attend Hpcl written exams on feb 17th in instrumentation stream..can anyone send me the HPCL model papers and pattern of HPCL ....i ve not yet attended anything in HPCL...so i dont know how it comes...so just i need some model test papers and pattern ..pls help me friends...

0 Answers  

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what is the input of digital RPM indicator during the calibration time?

1 Answers  

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if we mount flow tube in arrow direction then flow comes in negative & if we mount it another direction then flow comes positive,So what will be the problem

2 Answers  

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