Answer / surendra singh tanwar

I/O are required to convert the process value or status in
to a formet which can be communicated to the controller and
v/v controller to processe

Answer / delta_v

Remember that from field instruments the signal sent are only process data (example temperature, pressure); these data can't be read by the controller, hence it will become useless.
That is why IO cards are used to convert these to a readable signal which is 4-20mA.




"You cannot measure, what you cannot control"

Answer / makinde motunrayo

why we don't use I/O directly with controller.
The controller here is PLC, I/O is not use directly because of space the back-plane will occupy . i.e Organisation of instruments from field to the controller.

what is loop1 and loop2 in MTS LT?

0 Answers   SPGC,

---

what is pt100 RTD, and does 100 stands for

8 Answers   Tata Power,

---

Explain Gas Turbine startup and shutdown sequences

0 Answers  

---

what is ABB DCS SYSTEM?

2 Answers   OMV,

---

HOW TO CALIBRATE A DRUM LEVEL TRANSMITTER

2 Answers  

---

---

Induction type 1-p wattmeter reads ….. a) true value b) apparent value c)volt ampere value

3 Answers   Engineers India Limited,

---

what is type of protocol used in instrument field to marshalling cabinet cabel. what is the differenance between bus cabel and instrument cabel?

1 Answers   Samsung,

---

what is the input of conductivity sensor and meter during the calibration time and what is the output?

2 Answers  

---

NPN transistor, SCR, Zener diode, LED, Varactor diode, Vortex meter, RTD, Resistor, Crystal

0 Answers   CCIE, RTD,

---

why magnetic flow meter is not used in thermel power plant operation

2 Answers   JK Paper,

---

what is difference between wheatstone bridge, pirani gauge and strain gauge ??? explain its principle and working

4 Answers  

---

what is thermopile?

1 Answers   HNG,

---