Answer / senthilkumar saudi aramco

AI- Analog input (that means 24volt dc with 4-20madcdriving
the loop)

AO- Analog Output (that means only 4-20 madc driving the
loop)
D/I - Digital input (5volt/15volt/24volt/110volt supply
given from plc to the field switches
(pressure,level,limit,flow)to close the circuit or breake
the circuit.
D/O - Digital Output (PLC giving output voltage mode
24volt/110 volt to the field either solenoid valve or
electrical driven equipments

Answer / raja

AI - analog input
AO - analog output
DI -digital ""
DO- digital ""

these are the input and output types used in external cards
inserted in a plc . this ensures a proper selection and
processing of signals by PLC .

Important point is that they may not be the direct output of
a field sensor but a modulated one .

e.g - thermistor is provided in a plc itself for temperature
measurement . then it will be connected in analog input card.
2. pressure control to a p to i converter will be connected
in analog output card .

wat are the interview questions asked in air india for post service engineer

1 Answers   AirIndia, Shree Renuka Sugars,

---

What is the difference between ff transmitter and non ff transmitter

0 Answers   Samsung,

---

How to Calibrate Radar Level Transmitter in Field

0 Answers  

---

GIVE THE TEMPERATURE RANGE OF PLATIUM RESISTANCE THERMOMETER.

7 Answers   DVC,

---

what is difference between DO and DI

6 Answers  

---

how to measure draft pressure in transmitter pl. give its single line digram

0 Answers  

---

A RANGE OF TRANSMITTER IS (0-400)B mm abs what is "B"?

1 Answers   HCL,

---

what is written on orifice plate?

4 Answers  

---

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

1 Answers  

---

What are the type of bonnets in the control valves?

0 Answers   CCIE,

---

wich is coming the first HAZOP OR SIL

0 Answers  

---

How can I map a tank?  Tank 15m h and 42m dia. we just fixed radar type lit. its reading shows over range. Now its required mapping ?

1 Answers   CMC,

---