2-Wire, 3-Wire, and 4-Wire Transmitter
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- Опубліковано 13 лип 2024
- 🎥 In today’s industrial automation, the 4 to 20 milliamp transmitters are used in a wide range of processes for monitoring many parameters such as temperature. You should know that several types of 4 to 20 milliamp transmitters wiring exist, and they can be divided into three categories: 2-wire, 3-wire, and 4-wire configurations.
By watching this video, you’ll get the answer to these questions:
- What is the function of a transmitter?
- What is the definition of a transmitter?
- What are the output signals of transmitters?
- How to connect 2-wire transmitters to the PLC?
- How to connect 3-wire transmitters to the PLC?
- How to connect 4-wire transmitters to the PLC?
- What are the 4-20 mA transmitters' wiring types?
- What are the advantages and disadvantages of 2-wire current loops?
- What are the advantages and disadvantages of 3-wire current loops?
- What are the advantages and disadvantages of 4-wire current loops?
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💬 Video Summary:
- A transmitter is a device that senses the real-world signal from a sensor and converts it into the control signal. A broad range of voltage or current output signals is provided on transmitters. So far, the most frequent analog signal used in industrial applications is 4 to 20 milliamps.
- You should know that several types of 4 to 20 milliamp transmitters wiring exist, and they can be divided into three categories: 2-wire, 3-wire, and 4-wire configurations. These current loops have three things in common: a transmitter, a power supply, and a receiving device such as a PLC.
- In the 2-wire current loop, the current goes from the positive side of the power supply to the positive side of the transmitter. From there, the current goes from the negative side of the transmitter to the positive side of the PLC analog input. Then it goes back out of the negative side of the PLC analog input to the negative side of the power supply, and that will make our current loop.
- In the 3-wire current loop, from the positive side of the power supply, we bring 24 volts to power up the transmitter. Then the transmitter generates its desired signal current, which is the 4 to 20 milliamp signal going to the analog input of the PLC. And as the common side of the transmitter and the common side of the PLC analog input are the same connection, this is the return path of the 4 to 20 milliamp signal.
- In the 4-wire current loop by bringing the power supply voltage to the 4-wire transmitter, we make it operational. The positive polarity of the transmitter milliamp signal connects to the positive polarity of the PLC analog input. Also, the negative side of the transmitter goes to the negative side of the PLC analog input.
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⏰ TABLE OF CONTENTS ⏰
00:00 Transmitter Definition
01:16 4-20mA Transmitters Wiring Types
01:45 2-Wire Transmitters Connection to PLC
02:56 2-Wire Current Loop Pros and Cons
03:31 3-Wire Transmitters Connection to PLC
04:14 3-Wire Current Loop Pros and Cons
04:55 4-Wire Transmitters Connection to PLC
05:58 4-Wire Current Loop Pros and Cons
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Thank you Sir !
Very informative and useful video. Keep it up. Thanks for sharing your precious time with good knowledge.
So nice of you 💟. We try our best to share our practical experience with the audience that they will confront in the industry
2, 3 & 4 wire. Understood clearly👍👍👍
Keep up the good work!
Thanks for your support dear Babak
Merci mille fois...
Really helpfull, thanks for sharing!!, keep it up!
Thanks for watching! 💮
Excellent topic to share, keep it forward.
More to come!
Great explanation
Glad you liked it 😍
Informative Video
We are so glad to hear that. Thanks for your support 💮
You made my day
That's great to hear, happy to help 😉
Very informative
Glad it was helpful!
Very helpful
Glad you think so!
Beautiful.
We are glad you liked the video and we are honored to have such the audiences like you 😍
Thanks !!
Thank you for your kind comment! 🙏 We are glad you found the tutorial helpful! 😊 Don't forget to invite your friends and colleagues to subscribe to our channel and check out our other videos too! 🎉 We have more exciting content coming up that they might find valuable. Feel free to explore and let us know if there's any specific topic you'd like us to cover. Enjoy your learning journey and stay tuned for more! 🌟
great video! i have a question: every explation i found of the 2 wire transmitter mentioning an external PS, i have in a system a transmitter directly connected to the PLC analog input channel so in this case is it the PLC working as a PS ?? thank you!
please sir , it has any relation with npn and pnp analog modules , or this is the wiring for both ?
Helpful
Glad it helped 😉
This was a really great video, in 8 minutes I basically understand a concept that was a problem for me as a new tech. One question though about the three wire:
You mentioned in a 3-wire configuration that electrical interference on the process signal could cause a fault condition. Is this also not the case with all the other systems? Maybe something I'm missing there.
Thank you so much for your comment and we are thrilled to hear that the video helped you understand the concept of 2, 3, and 4 wire transmitters! Regarding your question about electrical interference, let us clarify:
If electrical interference is a concern, particularly in environments with high levels of electrical noise, it is often recommended to use a 4-wire transmitter or employ additional measures such as shielding, isolation barriers, or other techniques to ensure proper signal integrity and minimize the impact of interference.
Perfect
Thanks for you support dear Aria
My instrumentation professor’s voice sounds exactly the same as the voice in this video!
Could please support me with some instrumentation books
Excellent video, but current always flows negative to positive!
Hi, if I have to use a 4-wire transmitter in Zone-0&1 areas because Accuracy is critical. Then how to consider safety?
Should I depend on an explosion-proof enclosure?
Is the PLC and DCS, 3-wire configuration same ?
Tnx
You are so welcome 😉
what is the use of plc dc powersupply of plc vs power supply of transmitter
How to connect this water flow sensor YF-S201. delta dvp plc and there program in isp software
How long can this type of sensor can be installed?
Would you please be more specific? If I want to answer your question: as long as the power supplied to the transmitter and as long as no maintenance is needed for the transmitter
The 2 wire transmiter for general using internal power supply from PLC or using external power supply? Please the answer 🙏
It depends on what type of transmitter you use on the field. Large transmitters usually need a separate power supply (as we explained in this video), and small transmitters often use the internal circuitry of the PLC power supply to operate.
@@Automatedo thank you brother, im using Siemens s7-300 with CPU 313-C. Is need a external power supply or not 🙏?
You need to use a 24-volt DC PLC power supply, and it is usually installed next to the CPU
@@Automatedo I just looked at my PLC and read the datasheet, and it's true that there is an internal power supply from the PLC which is beside the cpu and I don't need to buy an external power supply anymore. Thank you very much. I'm waiting for your next video🔥
You are very welcome. We will be appreciated if you introduce this channel to other engineers like you so they can use the content as well. Cheers 🤗