I worked for an electronics manufacturer as a test enginner, and we had a customer who tried to design their own inductive-coupling system. IT WAS A FREAKIN' NIGHTMARE. The company had completely outsourced all their engineering, and they brought back ONE guy from retirement to design the inductive coupling communication system who had no business designing something like this. No EM modeling, no noise immunity testing, no error correction protocols, no modulation of the signal! Just driving a wire coil with a square-wave, and picking up the induced voltage on another coil using an opamp circuit (not even a differential amplifier). Of course the company tried to blame us (the manufacturer) for the poor performance of their flaky design, and as the test engineer responsible, I got pulled into this quagmire. Our final "resolution" was that we decided not to build this particular assembly for this company anymore.
Its not that new. I’ve seen it on a machine that is 15-20 years old. It has a turntable with 3 workstations that turns and the inductive couplers are used to connect part detect limit switches to the PLC
00:41 How is an inductor transferring DC power? according to faraday's law, if current through one coil is constant, 0 emf will be induced in the coupled coil.
Yeah, they didn't discuss that part. There has to be a pulse switching circuit built within the source side and a rectifier within the other side. You are converting DC to AC and back to DC.
Yes, there is more "magic" that happens inside the barrel of the transmitting device. Inductive couplers transfer power based on the principle of inductive coupling power transfer - ICPT. The 24VDC power connection is converted to low-voltage AC inside the device. The oscillation frequency is typically 200 kHz. This creates a changing magnetic field. And as Alexander notes, the receiver has a rectifier on the receiving side. The real magic is that there is a second circuit on each side that transmits and received 2.4GHz data that can be used to drive PnP digital signals or IOLink bus data.
@@realpars ok, thanks 👍. How good is it at avoiding electromagnetic interference from nearby devices/wires? Optocoupling was simple and effective in this sense. What advantage does inductive coupling have over optocoupling?
In the simplest since, the A and B sides of the coupler are both RC circuits. The magnetic field in side A (RC circuit through an inductor coil) induces a current in a matching side B inductor coil. www.researchgate.net/profile/Muhammad-Saad-17/publication/283265634/figure/fig3/AS:289178895695874@1445957029801/Equivalent-and-simplified-circuit-model-of-magnetic-resonance-coupling-3.png
I bet you could use these as an alternative for opto-isolators for separation between safety systems and non-safety systems. We use opto-isolators exclusively where I now work. But parts age and become obsolete. I'll have to investigate this technology (price and reliability) the next time an upgrade is needed. My initial thought is an optical isolator is cheaper, but it will be good for me to know for sure.
You are correct. The 24VDC circuits are isolated from one another. And you are also correct that true optical isolators for digital signals is much less expensive than inductive couplers.
Hi there, Thanks for your comment! We have recently optimized our learning platform which includes some highly requested features. We are happy to bring you these new improvements which will grant an even better learning experience, as a result we had to decide to no longer support the RealPars App. You can use our webpage to continue watching the video courses. Hope this helps! If I can be of any further assistance, please let me know - I’m more than happy to help!
I thought to power the sensors the couplers need 24 AC , not DC. How coupler circuitry is powered thru DC power, which cannot be transmitted via inductance ?
In the reply to another reader, I explained that for inductive couplers used for control systems, the transmitter has an oscillator circuit internal to the device to create the inductive field, and the receiver has an AC/DC rectifier internally.
hello, thanks for that great videos, really help a lot. Can you tell me wich program do you use to make this animations ? i will like to make some to teach students
inductive couplers are excellent for connecting and disconnecting multiple I/O at one time, using a simple, easily manipulated hardware interface. An example of the rotating table in the video is an excellent example. Up to 8 discrete I/O or a single connection to an I/O-Link device is common with Inductive couplers. Optocouplers are single-channel devices that require a chassis to be constructed to house the I/O, such as is the case with a PLC DI card. The connections, if portable, are going to be barrel connectors with many pins, that can easily break or corrode if plugged and unplugged often. Even though the application of inductive couplers is limited, in cases where they are applicable, they are by far the best technology to use for cost, maintenance, and reliability reasons.
I worked for an electronics manufacturer as a test enginner, and we had a customer who tried to design their own inductive-coupling system. IT WAS A FREAKIN' NIGHTMARE. The company had completely outsourced all their engineering, and they brought back ONE guy from retirement to design the inductive coupling communication system who had no business designing something like this. No EM modeling, no noise immunity testing, no error correction protocols, no modulation of the signal! Just driving a wire coil with a square-wave, and picking up the induced voltage on another coil using an opamp circuit (not even a differential amplifier). Of course the company tried to blame us (the manufacturer) for the poor performance of their flaky design, and as the test engineer responsible, I got pulled into this quagmire. Our final "resolution" was that we decided not to build this particular assembly for this company anymore.
Its Nut Now The $$$ Money Stupid What It is
Nice explain
How new is this? I've never heard or seen this before.
Its not that new. I’ve seen it on a machine that is 15-20 years old. It has a turntable with 3 workstations that turns and the inductive couplers are used to connect part detect limit switches to the PLC
I didnt know this technology. Great!!
00:41 How is an inductor transferring DC power? according to faraday's law, if current through one coil is constant, 0 emf will be induced in the coupled coil.
Yeah, they didn't discuss that part. There has to be a pulse switching circuit built within the source side and a rectifier within the other side. You are converting DC to AC and back to DC.
@@alexandernorman5337 excellent
Yes, there is more "magic" that happens inside the barrel of the transmitting device. Inductive couplers transfer power based on the principle of inductive coupling power transfer - ICPT. The 24VDC power connection is converted to low-voltage AC inside the device. The oscillation frequency is typically 200 kHz. This creates a changing magnetic field. And as Alexander notes, the receiver has a rectifier on the receiving side. The real magic is that there is a second circuit on each side that transmits and received 2.4GHz data that can be used to drive PnP digital signals or IOLink bus data.
@@realpars ok, thanks 👍. How good is it at avoiding electromagnetic interference from nearby devices/wires? Optocoupling was simple and effective in this sense. What advantage does inductive coupling have over optocoupling?
Vídeo ficou sensacional! Parabéns a todos pela produção 👏
Sir,what is the signal strength of magnetic field?
And how to convert magnetic field to DC output,what components are used at remote side.
In the simplest since, the A and B sides of the coupler are both RC circuits. The magnetic field in side A (RC circuit through an inductor coil) induces a current in a matching side B inductor coil.
www.researchgate.net/profile/Muhammad-Saad-17/publication/283265634/figure/fig3/AS:289178895695874@1445957029801/Equivalent-and-simplified-circuit-model-of-magnetic-resonance-coupling-3.png
I bet you could use these as an alternative for opto-isolators for separation between safety systems and non-safety systems. We use opto-isolators exclusively where I now work. But parts age and become obsolete. I'll have to investigate this technology (price and reliability) the next time an upgrade is needed. My initial thought is an optical isolator is cheaper, but it will be good for me to know for sure.
You are correct. The 24VDC circuits are isolated from one another. And you are also correct that true optical isolators for digital signals is much less expensive than inductive couplers.
Is there something wrong with the mobile app?
Hi there,
Thanks for your comment!
We have recently optimized our learning platform which includes some highly requested features. We are happy to bring you these new improvements which will grant an even better learning experience, as a result we had to decide to no longer support the RealPars App. You can use our webpage to continue watching the video courses.
Hope this helps! If I can be of any further assistance, please let me know - I’m more than happy to help!
Thank you, this video is very helpful!
Sorry RealPars, Can you make a new video to show how to connect this couplers to PLC?
Thanks.
Hey!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
I thought to power the sensors the couplers need 24 AC , not DC. How coupler circuitry is powered thru DC power, which cannot be transmitted via inductance ?
In the reply to another reader, I explained that for inductive couplers used for control systems, the transmitter has an oscillator circuit internal to the device to create the inductive field, and the receiver has an AC/DC rectifier internally.
@@realpars thank you, that's what I thought. Please explain how signals are transmitted: is it RF or still vis inductance ?
👍
hello, thanks for that great videos, really help a lot. Can you tell me wich program do you use to make this animations ? i will like to make some to teach students
Hi Ignacio,
Thanks for your kind comment!
I am actually not sure about this, our animations are created by our Graphic and Animation department.
Please, sir make some Input output hardwire connection in PLC
Hey!
Thanks for your comment and your suggestion. I will pass this on to our course developers!
Thanks for sharing and happy learning!
Ok interested idea, bat each sensor must be have unique ID...
Why? You could have virtually anything to detect which "set" is used.
Great video, excellent detailed info. Easy to follow!!
Much appreciated!
Thanks, what Company sell the indutive couple?
IFM, Balluf, TTI. There are others, I am sure, but these are the ones that I know have couplers for use in automation.
Thanks a lot!
Great video very useful. Thank you sir
Glad to hear that! Happy learning
What is the purpose to use inductive couplers instead of optocouplers?
In addition why should I use inductive couplers instead of photoelectric barrier?
inductive couplers are excellent for connecting and disconnecting multiple I/O at one time, using a simple, easily manipulated hardware interface. An example of the rotating table in the video is an excellent example. Up to 8 discrete I/O or a single connection to an I/O-Link device is common with Inductive couplers. Optocouplers are single-channel devices that require a chassis to be constructed to house the I/O, such as is the case with a PLC DI card. The connections, if portable, are going to be barrel connectors with many pins, that can easily break or corrode if plugged and unplugged often. Even though the application of inductive couplers is limited, in cases where they are applicable, they are by far the best technology to use for cost, maintenance, and reliability reasons.
Great ✌️❤
👍👍👍
Interesting a lot. 👍
Glad you think so!
Thank you
Our pleasure!
How the remote sensor is powered
inductively across the air gap, must be converted to AC for the inductive transfer function