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 .

where proximity sensor installed on tank in loading arm application

0 Answers  

---

what is the input to be given in digital flow meter during the the calibration time?

0 Answers   ONGC,

---

Where should we terminate the shield and why?

3 Answers   OPaL,

---

can i use capillary type dp transmitter converted to capillary type pressure transmitter. if i removed one side capillary tube its work correctly?

1 Answers  

---

Watt is Wrms define rms?

2 Answers  

---

---

What is the meaning of wet leg

0 Answers  

---

what is radar type level transmitters and its basic principle and how to calibrate it

4 Answers   ABB, Inovonz,

---

Why is a dead weight tester so called by that name?

1 Answers   SGS,

---

please explain about actuator action? direct action & return action ?

1 Answers  

---

Can be operate control valve without positioning if yes ? how and why?

4 Answers   Focus,

---

Q- In the process of checking AC through Phase Tester our body is the part of circuit but we don't recevie Shock, Why ?

2 Answers  

---

In Increasing temperature why thermocouple used and RTD is not used. Both RTD and Thermocouple have in Range of uses.

5 Answers   L&T,

---