Answer / mugil

Assuming 24 vdc I/O cards.

On a transistor output card Sourceing is PNP or Active High. This means that you connect the output to the + side of the load device and connect the other side to 0vdc. If the output Card is Sinking it is NPN or active low meaning that you would tie the + side of the device to 24vdc and the common would connect to the output card.

On input cards if the input card is a sourceing card you would use NPN sensors. The cards common connection would be to a +24vdc source and the device (sensor) would give a path to 0vdc. If the input card was sinking you would use PNP sensors. The sensor would be connected to the + 24vdc source and the output from the device would connect to the PLC input card which would have a common connection to 0vdc.

What is the use of keyphasor in turbine.

7 Answers   Hindustan Zinc, R&D,

---

re i got gre score of 950,and toefl of 69 is this score sufficient actually my husband is presently in US i need to go please help me

1 Answers  

---

can you suggest good traning institute in instrumentation ? (in automation, or designing)

5 Answers  

---

please tell me how maintainence person shifted to good epc company/design company

0 Answers  

---

how to tune the closed pid loop?

3 Answers  

---

I want to measure and control level in tank of size 10*5 filled with gasoline, so plz give me the solution with clear details. how to select transmitter and sensors.

0 Answers  

---

What is the difference between Error and Offset.

1 Answers  

---

How will u convert the mmh2o in mass or Volumetic flow rate in DP Flow Transmitter. Give me the Brief explain using the formula

1 Answers   Walchandnagar Industries,

---

1. For Steam drum level signal, why do we compensate with drum pressure signal? 2.For main steam Flow signal is comensated with main steam temperature signal and main steam pressure signal why?

0 Answers  

---

Define cryogenic?

0 Answers  

---

Specify for Cables - Flame Retardant and Fire Resistant?

0 Answers  

---

HI, can anybody give details about GAS TREATMENT PLANT CONSTRUCTION,as INSTRUMENTATION ENGINEER what are the responsibilites.what are the instruments mainly instrumentation engineer will deal with

0 Answers   GSM, IOCL,

---