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.

If The RTD(PT100) Show .776 Kohm Resistance the Temperature of process fluid how much?

3 Answers  

---

what is dead weight tester and where it is used?.

11 Answers   DuPont, Jain steels,

---

how many types of thermocouple cable are? give the name of each type.

1 Answers   Fabco,

---

why we used for range in pnumatic 3-15 psi and current 4-20 ma?

11 Answers   Jindal,

---

how to calculate temp.prapotional to mv in thermocoulpe.

2 Answers   Electronics, KNPC,

---

pressure switch range 0 to 2bar.i have to install from ground level to 5 meters height.what is the formula the to increse the range ? and every 1 meter how much pressure should be add ?

3 Answers  

---

The Design Calculation of Level Transmitter For Different Structure open & Closed Vessel, Eg. Diff. Level Tx., Capacitance For Continous Operation

0 Answers   Reliance,

---

Define the difference between a stable versus an unstable controlled system and some of the tools you might use to be able to detect when this is happening and assumptions used for control system application design that could contribute to instability

0 Answers  

---

i feel sq. pipe is better than round pipe pls give comment for this. advance thanks for reply

3 Answers  

---

what is the dp across a orifice plate & how much is permanent pressure across an orifice plate.

2 Answers   HPCL,

---

What is the use instrument barriers? Can you give me review materials about this?

1 Answers  

---

What is the Difference between PE,IE and ISE

2 Answers  

---