Answer / barok

AI- means input of 4-20mA comes from transmitter to DCS
AO- means output of 4-20mA comes from the controller on DCS
DI- means input of 0 and 1 comes from switch to DCS
DO- means output of 24VDC come from DCS going to solenoid.

Answer / mahmoud zaki

EX. DI like sensor.limit switch and bush bottom
DO like to run for example motor
for contactor or relay or solnid valve

AI like level transmitter or pressuer transmitter TC
AO like control valve

Answer / sudarshan sankapal

AI means field genarated signals comeing to Dcs or PLCs by the use of 24v DC suppy... ex sensors
AO means DCs or PLC genarated or field genarated signals going to control process parameters...ex control valves input 4 to 20ma
DI its logic signal 0 or 1 state came from electrical VFD drives or field...
DO its logic signal genarated in DCs to control feild process parameters..ex solenoid valves

Answer / mayursinh amw

A0 means analog voltmeter, supply come from AO cardto volt
meter

how to calibrate the temprature transmitter MURCREYtype and thermocouple input type.

1 Answers   Shree Cement,

---

how can we measure the pressure in underground cooling water pipeline by using pressure transmitter?what about the tapping position?

2 Answers  

---

why we use 24 vdc in instruments mostly?

2 Answers  

---

How many problems can be occurring in solenoid valve? And how it can be rectified?

1 Answers   Adgas,

---

What is re-latch the manual trigger in solenoid valve

0 Answers   Valvitalia Systems Division,

---

which is the best type to measure level of a Tank(water). Displacer or Differential Pressure method?

2 Answers  

---

How we select the range of level transmitter in closed vessel ?

4 Answers   Rosemount,

---

How do you measure g's?

5 Answers   Aramco, GNFC, HPCL, Polmon, Thermax,

---

I am a instrument technician. recently i attend interview and face one of question for DP transmitter ,the client asking about the calibration of DP transmitter ,am answer the calibration procedure, they will ask one more question. why open LP side in atmosphere? i did not answer that question. so please help me and explain the particular question. Dear firends waiting for your valuable replay

3 Answers   Qatar Petroleums, Samsung,

---

how to calibrate corollaries (Mass flow meter)?

0 Answers   Honeywell,

---

how to work MIL contol valve posistioner ?

0 Answers   ABB,

---

Im working in a shopping center, it is also hotel and office building, two towers exactly and someone is proposing a PLC control for the HVAC system, but Im thinking of a DDC control system. in this case what is the difference between PLC and DDC control?

1 Answers  

---