Answer / nilesh

Question not clear.

1.PLC has its own controller which execute the
program.Before every program run PLC read the input and
after program execution generate output accordingly.
2.If PLC I/O need to be control from operator station (
DCS/SCADA) then PLC need to be connected to OS through
serial link/Ethernet

Answer / kawa

Yes of course we can either through its own HMI or through
seiral liks with some other control system (DCS).

Answer / ashish namdev

Operation station system no have any program (programming built in Engg. Station Only which is a server also)

but operating station system is connected with same network of plc/Dcs through Ethernet or other.

than that station has a SCADA software which is connect it to server system station through IP protocol.

 than we can access or give command through Operating station.



Ashish Nmadev
Sr. Engg In Jaypee thermal power plant, Bina(MP)   

how the 4 to 20 mA signal goes to any controller/indicator,and what is the role of voltage ,12/24 and how to do connection of it, in controller.

1 Answers  

---

what is meant by calibration

20 Answers   Exxon Mobil,

---

in differential pressure transmitter,min&max pressure range for hp&lp

0 Answers  

---

how many types of viberation transmitter and how to calibrate and where use of vibration transmitter

0 Answers   Sabic,

---

Hi,can anyone help me out with PhD programs related to Instrumentation field?I have a degree in electronic Instrumentation?

0 Answers  

---

What's the difference between cold loop test and hot loop test?

5 Answers  

---

What is the procedure of calibration of Load cell?

0 Answers  

---

square root calculation for dp flow transmitter? give me a explanation with example

3 Answers  

---

Explain the working of rota meter.

0 Answers  

---

1.what is the effect of vapour presuure in orifice plate flow measurement 2.which is more effective 2 pressure sensors or one single differential pressure sensor in orifice plate measurement 3.how to design a v/i converter and i/v converter 4.how many type of thermocouple are there 5.how many leads are there in thermocouple measurement 6.how pressure sensors are connected in level measurement in differential pressure method 7.what is the output of capacitive pressure sensor (ac or dc),how its o/p is signal charactarized 8.what is the physical meaning of discharge coeeficient,why it is calculated,orifice plate what is its value,why it is less than 1,Q at upstream is equal to or not equal to Q at downstream of orifice plate why?what is vena contracta in orifice plate 9.why rotameter is called variable area flowmeter,it can measure flow even if area is not varying,why it is made tapered 10.design a 10 bit counter ,which counter you will prefer 11.how to remove self heating error in RTD 12.which is more sensitive pt100 or pt50 13.why thermocouple are connected in parallel 14.what is lead contact error in RTD,how to avoid 15.what is P,PI,PID,PD controller,why there is no ID controller 16.what is override,split range,sequential,ratio,feedforward,cascade controller 17.why we moved from SR to JK and then JK to master slave JK flipflop,give correct reason 18.how to measure level of a closed container which contains vapour and liquid,remember no vapour gas should be leaked,so ultrasonic and capacitive is not an option,design another method 19.how to design horse race counter including sensors and signal conditioning element 20.what is bevelling

0 Answers   BARC,

---

what are the pinciples & units of flow, level, temperature, pressure, quality.

1 Answers  

---

You are looking at the RS-485-side of an RS-232/RS-485 converter and the power supply voltage for the converter is +5V. Under idle conditions (no transmission), and assuming you have enabled the RS-485 output: what would you expect at: (a) Output A measured against output B (b) Output A measured against ground (c) Output B measured against ground

1 Answers   EIT,

---