How to Wire Discrete DC Sensors to PLC - Part 2

[@caffeinatedinsanity2324]

To those who might struggle with sinking vs sourcing input plc cards: Sinking means that the input needs to be connected to +24 V to cause it to be detected as "activated". Sourcing cards mean that you need to connect the inputs on the negative of the 24 V. And now for PNP vs NPN: PNP: when the sensor detects something, it's signal (or load. Black wire) gets connected to +24 V, so it "pushes" or "sources" 24 V. NPN: when detecting something, the signal wire gets connected to the negative, so it will "pull" or "sink" current. Same logic applies if you want to use 2 wire sensors in both types of cards.

[@enverismail6864]

So on the npn card you need -24 power supply. That must be connected to the bottom of the IO card (the very last slot) and the common must be connected to the very first slot; where the +24 would normally be supplied. It's the only way this is making sense to me

[@remingtonnathaniel6730]

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[@bentondarren9521]

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[@remingtonnathaniel6730]

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[@remingtonnathaniel6730]

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[@mikeduman358]

I have been an electrician for 20 yrs I understood the concept but the kiddies on the job always took the PLC wiring and us older guys did the heavy lifting, motors,conduit this helped me greatly thank you

[@eugenepohjola258]

Howdy. Nice presentation. A couple of comments. 1. Using 2 -wire sensors (= Namur) the leaking current may be large enough to be detected as ON by the PLC DI card. To remedy this an external resistor of, say 10 k, may be connected over the input channel to deliver proper "sinking". 2. Separate 24 VDC power supplies should be used for input circuits and outout circuits. This prevents inductive load backspikes from generating "ghost" ON detections in input circuits. Alternatively the +24 rail may be splitted into two secondary + rails using two diodes in a back-flow blocking configuration. P600J is a 6 A diode. One secondary + rail powers the inputs and the other powers the outputs. The output secondary + rail should be fitted with a large electrolytic capacitor after the diode, say 2200 uF, between the + and the - to provide a place to go for possible backfire spikes. Electrolytic capacitors are not necessarily fast enough to kill spikes effectivery so a plastic capacitor of, say 1 uF, may be connected in parallel with the electrolytic capacitor. Regards.

[@realpars]

Thank you, Eugene! We appreciate your insightful comments!

[@isaacadokwah2739]

One of the best PLC videos ever. Very elaborate for easy understanding. Thanks for these great videos.

[@realpars]

What a great compliment, Isaac! Thanks a lot! We are always extremely happy to hear such positive feedback! If you ever have any questions, feel free to reach out to us. Happy learning!

[@lukaskohout419]

8:00 i think there is error in diagram--- if we talk about Voltage which is difference in potential between two poles then if you are showing +24VDC as positive pole and -24VDC as negative pole then you have potential of 48V! So it should be +24V and 0V or +12V and -12V etc...

[@realpars]

The blue wire is common, or the negative side of the 24VDC power supply. The voltage difference between +24VDC and what is shown as -24VDC (common) is 24VDC. To be clearer, the common connection should have been shown as 0 VDC. Thank you for the observation and comment.

[@bobbyyoung2831]

Great Free advice and videos. Much appreciated.

[@realpars]

Glad you like them!

[@TheGoodSon89]

Massive respect for sharing knowledge. Keep going!

[@realpars]

Much appreciated!

[@mernilodeleon4081]

Yes sir...thanks a lot everyday i am watching your shared videos ...coz directly related to my work now...i wish i ciuld able to join your training....one of these day. Thanks and more power....

[@realpars]

Thank you Mernilo! Glad to hear that you're enjoying the videos.

[@suchayanmondal9858]

Very Informative videos. Thanks for providing us for the knowledge. Please produce more nice videos on several PLC related topics like this in future. Awaiting for the next.

[@rodrigocardenassill4700]

The best channel to learn, thank you for your valious content

[@realpars]

Thanks for your comment! Happy to hear that!

[@suheladesilva2933]

Great video, cleared a lot of my doubts, thanks.

[@realpars]

Glad it helped! Happy learning

[@D0m1n4t0r33]

Thanks alot for your videos, they surely are helpful if you're setting up stuff for the first time!

[@realpars]

Great to hear that, Bas! Thanks for sharing.

[@BW-xz6ol]

14:30 if connecting to plc input 3 shouldn’t black wire Goto B? I think you meant to say if it connects to plc input 2 then it goes to terminal A. I’m new to all this... so thank you very much for all your videos

[@juliuscontrolsandautomatio6861]

So great! So good! 👏👏👏👏 I'd like to learn about how to Wire Discrete DC Sensors to Variable Frequency Drive.

[@realpars]

Great suggestion! Thanks for sharing and happy learning, Julius!

[@eng.mohamedfandod1937]

excellent Go ahead i will support your channel in every where .

[@realpars]

Thanks a lot for your support, Mohamed!

[@michaelcostello6991]

well explained with appropriate diagrams. Only guys like you should have a license to teach !!!

[@realpars]

That's a great compliment, Michael! Thanks a lot!

[@yosefali7729]

is it safe to power the Sensors and field devices through the PLC input card, most cards have really low limit on current so connecting like 10 - 12 devices might be risky, how about powering it through a Power supply instead from the PLC input card ? wouldn't that be better ? appreciate your efforts in simplifying this great effort

[@realpars]

Thank you for your question. In our videos, we focus on sensors specifically designed to interface with a PLC. The input cards are responsible for receiving signals from these sensors, while the output cards supply power to your device according to your engineering specifications and current requirements. If necessary, the output cards can also power relays for handling larger currents. Every industrial PLC manufacturer typically provides a manual detailing how to use and program their PLCs. Additionally, it's important to ensure you have a suitable power supply to energize your system. Happy learning!

[@mernilodeleon4081]

Great job...more technician like could benefits this learning....please continue...

[@realpars]

Thanks for watching Mernilo!

[@longhungtruong7980]

I have one question for RealPars: What exact function difference between 2-wire and 3-wire DC sensor? Use the 2-wire one is more easier than 3 wire when we connect with PLC. So, Why we don't have 2-wire DC sensor for Level switch and pressure switch? The information of this video is excellence. Please help me answer previous question. Thank RealPars.

[@realpars]

The difference is fairly simple to explain. Sensors that are simple contact closures, such as limit switches, flow switches, hall-effect proximity switches, and vibratory level switches are all two-wire devices. One wire is 24VDC+ and the other is common, or 0VDC. These sensors are either mechanically or magnetically actuated or can use the 24VDC+ wire to power the device. Sensors based on solid-state technology require 3 wires. Solid-state devices are based on transitor circuits which require 3 wires: 24VDC+ applied to the base, a signal wire that goes back to the PLC as the input from the collector, and a ground wire for the emitter. Solid state devices are smaller and many times configurable as to setpoint, trip point, etc., but they also require 3 wire connections. That is why it is important to understand how to properly connect these to the PLC.

[@longhungtruong7980]

@@realpars So, Thanks for your explanation. I'm clear about function of both sensors types. Please release more videos like this. I keep following and learning with you.

[@eliehajj3777]

A "Sinking" PLC input card has (0 VDC) commonly connected to all its Inputs. Therefore it needs PNP Sensors to be connected to it. A "Sourcing" PLC input card has (+24 VDC) commonly connected to all its inputs. Therefore it needs NPN Sensors to be connected to it. So for the example in the video above the inputs (from I0.0 to I1.7 ) should be commonly connected to ( - ), therefore terminals 10 and 11 should be connected to ( - ), not to (+24 VDC) because it is a "Sinking" input card and only accept PNP sensors. I hope that I'm wrong.😀

[@Rexbo12]

Really well explained. Thank you

[@realpars]

Glad you liked it!

[@Rexbo12]

I'm just starting to learn about plc as its going to be needed for my new position thanks a lot even dumb ass like me can understand

[@spatikmedia]

Awesome..thank you Realpars

[@realpars]

You're very welcome!

[@user-ro6ou5vb8y]

Thanks God for sharing this matter i indeed very interested and i wish i could learn more about plc such as how to program.

[@realpars]

You are welcome!

[@adriandeluna8906]

Perfect video congrats to your channel..

[@realpars]

Thank you very much, Adrian!

[@ahmedadebakin8189]

Really nice video but I have one question concerning NPN sensors. If I give positive to the brown wire from the PLC will I still connect same to common of the Input card?

[@P.J16]

7:49 Blue wire should be -24 Vdc or just O V?

[@realpars]

It is best to consider the blue wire as common, or 0V.

[@darbarisid]

Very good explanation

[@jimbass924]

Very informative, great graphics!!

[@realpars]

Much appreciated!

[@andyhandyman2118]

Always like and subscribed!

[@realpars]

Thank you, Andy!

[@bitebonumbere1426]

Awesome videos. Please can you upload the subtitles? The auto-generated one is difficult to follow. Thanks.

[@realpars]

Hi Bitebo, Thanks for your comment! We have English subtitles for almost all our KZbin video courses. Unfortunately, some of our older video courses do not have this, and only have the auto-generated option. Sorry about that, hopefully you are still able to enjoy them!

[@bitebonumbere1426]

@@realpars meaning is it impossible to add subtitles?

[@dilantharuwan7373]

Nice explane and great work.keep it up

[@realpars]

Glad you liked it, Dilantha!

[@toddmaggio2032]

Thank you for your educational videos. I have a two question that you might have already answered elsewhere. If so I'd be grateful for the links. Can a proximity sensor be used as a SPDT switch? Say I want a conveyor belt go back and fort. Can the wiring be tweaked in such way that sensor reverses the direction of the electrical circuit and make the conveyor belt reverse its direction?

[@realpars]

A proximity sensor be used as a SPDT switch only if it is designed as a SPDT switch. Many (if not most) proximity switches used today are solid state, so there is only one output available, and it is transistor output, not a Form C contact. For your second question, you can use the proximity switch input as a trigger for PLC logic to act to reverse the belt. You likely will also need some timers in this logic as well. If you were to do this in a hardwired system, it can be done with a series of relays, sensors, and timers, but the proximity sensors would still be wired as shown in this video.

[@tomcasarella6061]

A PNP device is wired to a PNP card the common on the card is Negative input to the card is Positive

[@mateorenai]

Hello.. Thankyou for your clear explanation about this. I am just learning about this PLC thing. but i have more question. how do you connect multiple let say 4 Proximity sensor. Thanks again

[@photog1529]

New to this, but a question. at about 14:34, you state if the proximity switch is connected to terminal 3, the load wire would be connected to "A"...shouldn't the load be connected to "B"?

[@realpars]

At that point in the video, the schematic correctly shows a PNP sensor connected to the first channel of the PLC card, which is at terminal 2 of the input card, or terminal A on the marshalingpanel. The narration says "PLC input channel 3", the black wire should be connected to C, which is connected to screw terminal 4 on the PLC card.

[@KevinNguyen-tw5ml]

Thank you very much !

[@realpars]

You are welcome!

[@tipko1863]

Am I missing something or is the wiring diagram for the PNP type switch around 9:09 (where - is the common wire on the input cards) different than than the one shown around 13:57 where the +24V is the common for the 2 groups of inputs?

[@realpars]

No. in both cases, the (-) is attached to terminal 20 on the I/O card, which is common (blue wire).

[@tipko1863]

@@realpars Alright, so then the wires connecting pins 10 and 11 to 24 V are used to power those groups of inputs or something else?

[@wasuts.444]

Your videos very helpful, Thanks very much. and I saw the subtitles start at 15:35 explain about PNP but your are talking about NPN first, I think the subtitles was wrong place, just let you know.

[@realpars]

You're right! Thank you for letting us know.

[@wasuts.444]

RealPars You’re welcome.

[@deku4497]

I am confused with the explanation in time stamp 14:00. I thought if we will be using a PNP sensor, we need to use a Sinking Input Card. From what i know the input card he uses to demonstrate it is a Sourcing Input Card. Because the +24V is the one that is shared to the terminals 10 and 11. Please help I'm a beginner and I'm confused.

[@deku4497]

Or maybe I'm wrong for thinking that it is a Sourcing Input Card based on it's internal connection. Please correct me if im wrong

[@realpars]

The card shown is one of several Siemens SM321 digital input cards that can support 2, 3, and 4-wire sensors in any configuration. [support.industry.siemens.com/cs/mdm/8859629?c=97343653771&lc=en-MY]. The PNP sensor is sourcing, so the +24VDC is applied to the sensor (brown wire) and when switched, the current is sunk to ground through the DI input terminal to ground. In the above link, follow the signal through the circuit to "M", which is connected to terminal 20 (ground).

[@franciscojorge6568]

That's so cool plc exemple.

[@yem.t.3930]

Very comprehensive ! Thanks

[@realpars]

You're very welcome!

[@marcbiss5953]

Very clear and informative! Thanks

[@realpars]

Great to hear that, thank you!

[@ardentdfender4116]

Along with this very well explained video, can you please add a video for “loop Checking” or how to properly Loop Check of devices to Terminal Block or Input Card/ Output Card module for the RealPars video team to do.

[@realpars]

Thank you, Ardent! I have gone ahead and forwarded your topic suggestion to our creator team. Hopefully, they can add it to the list. Thanks again!

[@MrPromerican]

Thank you real pars

[@realpars]

You are very welcome!

[@hayel2015]

You are the best to explain the PLC💝💝💝👍👍👍

[@thairaltimemy7287]

Thanks a lot for your good ,brief , explanation....keep going

[@realpars]

You are very welcome, Thair! Happy learning.

[@night_grinder1378]

Greatvideo. Real pars. Can you make video how to troubleshoot devices.? Thanks it will help a lot.

[@realpars]

Thanks for your support, Christian! And thanks for the topic suggestion, I will definitely go ahead and forward this to our creator team. Happy learning!

[@boothhits6144]

great channel thank you so much

[@realpars]

Thanks for your support!

[@mnada72]

Sinking switch (NPN) needs sourcing module hence the common of the module is positive Sourcing switch (PNP) needs sinking module hence the common of the module is negative

[@xhuljan11]

Thanks a lot ❤️

[@psi23k]

@8:23 you show the brown wire from the npn sensor connected to the negative of the I/O card. Is that correct? Shouldn't it be connected to 10 or 11?

[@realpars]

For a sinking sensor, the brown wire is connected to the most positive terminal on the PLC card. In this configuration, 24VDC is applied to the common terminal of the PLC card, as shown. This is true for the Siemens DI card chosen, but it is always good to check the specific wiring diagram for the card you are using before connecting a sensor. Some manufacturers have different models of DI card depending on the sensor type (sinking or sourcing).

[@sntgjmb6195]

Thanks for the information, from Ecuador

[@realpars]

You're very welcome! Happy to have viewers from all over the world! Happy learning ;).

[@maruthiprasad8184]

Team,Thank you so much for valuable information. I have a doubt on control valve resolution concept from long time. Is it possible to make a video on this concept. It will be great help to everybody.

[@realpars]

Hi Maruthi! Thanks for your comment and your suggestion. I will pass this on to our course developers! Thanks for sharing and happy learning!

[@DannyJaves]

The best information excellent

[@davidpalmer963]

Image result for what can a inductive proximity switch detect? Inductive proximity sensors can only detect metal targets. They do not detect non-metal targets such as plastic, wood, paper, and ceramic

[@kittylayyon2789]

Thanks real pars

[@realpars]

You are very welcome!

[@vishnukr8010]

Hi, Can we ever connect a PNP sensor to PNP I/O card? I got a qsn like that in an assesment, any possiblity please help.

[@realpars]

Yes, it is possible, but you will need to modify the circuit with a resistor and non-standard wiring connections. I do not recommend doing this because it will confuse other techs who may need to maintain the system.

[@vishnukr8010]

@@realpars I got this as a qsn on one assesment..? Is there a proper answer for that ..is that just a pull down resistor

[@realpars]

@@vishnukr8010 I believe the 24VDC connection at the I/O card is removed, and a 10k resistor is placed between the (-) terminal and ground for the digital input. Again, this is not standard and would require specific detailed documentation to avoid future issues. I would say the proper answer to an assessment question would be "no" if the question was looking for a binary choice. If you were to able to provide an explanation in the answer, I would respond, "yes, but the solution is non-standard and should not be implemented unless absolutely necessary".

[@vishnukr8010]

@@realpars thank you mate.. Its not a boolean type I have to draw the electrical circuit and submit. Anyway, thank for your reply it was very helpful.

[@mprv3755]

Great video. Possibly a video on how to use “scale/ scaling ” PID instruction on Analog instrumentation on Siemens or Allen Bradley?

[@realpars]

This topic is covered in a 9-part course on using the PID instruction in an S7-1500 on the Realpars.com learning site. Come subscribe and give it a try!

[@zukhriddinmirzaumarov1758]

Thanks, really good job!

[@realpars]

Great to hear! You are very welcome.

[@erturkmemmedli1790]

In 13:43, you show connection for pnp. So I guess for npn, unlike pnp, red wire must connect to 20 (negative terminal) and blue wire must connect to 10 (positive terminal). However, for npn, in 8:43, you showed red wire is connected to positive terminal of power source and blue one is connected to negative terminal of power source. I didn't get it. With that way, we connect positive terminal of power source to 20 in PLC (negative side), how is it possible?

[@realpars]

You make a good observation. But remember what was indicated in the video: a sinking discrete input card (for use with pnp sensors) and a sourcing discrete input card (for use with npn sensors) operate differently and are also wired differently. The function of Terminal 20 in each type of card is also different. Most plants will use pnp sensors with sinking input cards, simply because they are most common and are easier to wire. The npn and sourcing input cards sensors are mentioned because there are some industries where these type sensors are more common, and most manufacturers offer products with both types of configurations. It is therefore important to know the differences and specify the right type of sensor, and the right type of PLC card.

[@erturkmemmedli1790]

Thank you very much. I haven't noticed that the connections for sinking and sourcing discrete input cards are different. Now, everything is totally okay :)

[@almir2673]

RealPars in the video npn is sinking type and pnp is sourcing, very useful video by the way, thanks for sharing your knowledge.

[@javierferrer4634]

Very nice video!

[@jcerranom]

Simply Awesome!!

[@realpars]

Glad you like it, Julio!

[@isidrovaldez2391]

I don’t think that an inductive proximity switch could detect a box. I was under the impression that an inductive prox only detected ferrous metals, and a capacitive proximity switch would be used to detect things like plastics, wood, liquids, and boxes.

[@imamulkabirhimel7477]

What if i want to connect npn switch. Should the brown be connected to 20 and blue to 10?

[@abrahamgreenidge8924]

Hello, do you have any basic basic basic instructional video on the wiring of PLC? I’m neww to this & has 0 experience.

[@realpars]

This video and the companion Part 1 video provides good instruction on wiring discrete devices to the PLC. Other RealPars videos give instruction wiring other modules, power supplies, etc.

[@richatpurba9047]

so if we accidentally buy a PNP switch when it should be an NPN switch, we can't just switch the wiring termination to make it works?

[@realpars]

This can be done only if the PLC card supports sourcing and sinking type switches. An NPN sensor requires a sourcing PLC input and a PNP sensor requires a sinking PLC input.

[@Levon9404]

Tank you very much for very informative vedios

[@realpars]

You're very welcome Levon!

[@SinhPV]

Useful a video ! Thank for sharing...

[@realpars]

You're very welcome!

[@hiwaabdulrazaq7920]

Thanks

[@venkatvijayakumar6176]

Hi, I have two Level Sensors which is 4-20mA type. But, I have only one 24 VDC supply adapter. Is it possible share the DC supply to two sensors to get the 4-20mA output?

[@realpars]

Yes, as long as your power supply can output at least 50ma (20ma for each sensor). This is normally how analog circuits are set up: common power supply with individual milliamp signals back to an analog input card. The sensor is the device that regulates the milliamp signal.

[@venkatvijayakumar6176]

@@realpars Thanks a lot, I'll check on that.

[@priceless55]

Simplicity is the key. :)

[@realpars]

Definitely! ;)

[@eliosgreek8028]

Great video

[@realpars]

Thank you, Elios!

[@glaucioferreira13]

Thanks for this usefull video!

[@realpars]

You are welcome, Glaucio!

[@Logical_Controls]

Informative video. Thanks. FYI slight text error @ 7:53

[@realpars]

Thank you! Happy to hear! I just double checked to video. However, I couldn't spot any error.

[@Logical_Controls]

Thanks for the reply Realpars. Nothing major, it's just says +24VCD instead of +24VDC. Also shouldn't it be 0VDC for the blue wire as opposed to -24VDC which is a negative voltage instead of a ground?

[@chuchuokeke]

Also, plc terminal 2 is point A on the marshaling terminal block..i think you said point 3 is A..great work, very informative. Keep it up for more likes!

[@hoangzxc2467]

oh hi, It makes me confused and wondered when the actual PLC I/O cards in this video that's not shown the actual power supply used to power the card(I mean it's just shown that the card requires +24VDC power and there's only +24VDC (shown by number) to the terminals(at 12:20). it's quite different to the PLC module's common terminal shown at (8:28) ), please help me to understand that correctly

[@realpars]

In order to highlight the important wiring connections, we often just represent the power connection as +24VDC and common connection as COM. If we had shown the actual power supply in the diagram, +24VDC and COM would be connected to the power supply at terminals of the same name.

[@hoangzxc2467]

oh hi, in this video, is proximity switch the same proximity sensor ? (at 6:01)

[@realpars]

Yes. A proximity sensor is typically a solid state switch that is tripped when the sensor is moved near a target.

[@shuhaibvk2456]

Very informative👌🏼

[@realpars]

Happy to hear that! Thank you, Shuhaib!

[@phillyo51]

How can you find out which cards are compatible with PNP or NPN?? I've checked the siemens support website but have found no information. Cheers.

[@realpars]

Check out this article: support.industry.siemens.com/cs/document/23451499/what-is-the-meaning-of-the-terms-sinking-(german%3A-p-lesend-)-and-sourcing-(german%3A-m-lesend-)-in-digital-modules-of-simatic-?dti=0&lc=en-WW The cards compatible with NPN and PNP wiring are listed toward the bottom of the article referenced above.

[@MegaRyad]

if you put electrons going in and out in the animation it would have been better to understand this pnp and npn sensors , thank you

[@realpars]

Thanks for the feedback! I will happily go ahead and pass this on to our course creators. Thanks again for sharing and happy learning

[@andersonsardinha1504]

Perfect 😃

[@AgentK-111]

i cannot understand why the black wire of the sensor is conected to the terminal A when, the plc input channel 3 corresponds to terminal D

[@realpars]

Kostadin, thank you for your comment. You are correct. The video narration indicates Channel 3 on the PLC card, which corresponds to marshaling terminal D, if you consider the channels on the PLC card to be 0 - 7. To be honest, to avoid confusion, the narration should have indicated "connected to the first channel..." which would be marshaling terminal A.

[@AgentK-111]

@@realpars thanks for answering

[@anwarmuzamil6972]

Which type of PLC is used for connecting dc sensors??

[@realpars]

Most any PLC can interface to DC sensors. You just need to have I/O, either connected to the PLC or in remote I/O racks that support DC sensor signals. It is the type of I/O card that determines the signal interface allowed at that card, not the type of PLC itself.

[@mikemwabilwa572]

Many thanks

[@realpars]

You are very welcome, Mike!

[@rongulamhusain981]

I want to learn plc course, kindly let me know how should I connect to u

[@realpars]

Hi Ron! Thanks for your comment! Great to hear your motivation in regard to learning PLC Programming. 

Our course library is specifically designed in a way where it provides all the tools needed for beginners to evolve into an advanced level through our hands-on courses. Feel free to browse through our course library to see all the different topics we are covering. bit.ly/30AVJaR Just to let you know, that we also have a free course on PLC Hardware bit.ly/2XnnUrF
 If you are interested, you will obtain full access to our complete course library (400+ video courses) by subscribing to either our monthly package for €22.12 a month or our yearly package for €159.28,-. 

Additionally, you will have access to our Technical Team - consisting of high ranking engineers with a lifetime of experience - who are here to help you out with any questions you might have along the way! 
 Hope this helps! If I can be of any further assistance, please let me know - I’m more than happy to help!

[@oyekanmibamidele6196]

@@realpars Sir, I'm seen different prices on your website?

[@oyekanmibamidele6196]

@@realpars l would have sub for a year package

[@frankietrenado9327]

I believe if wiring into IO channel 0.3 the black input wire should go to terminal D

[@realpars]

It does. In video, terminal 1 is 24VDC, terminal 2 is I0.0, terminal 3 is I0.1, terminal 4 is I0.2, and terminal 5 is I0.3, connected to "D".

[@GRant16NCH]

Thanks for video

[@adhavtejashri]

How we can connect 2 proximity switches at 24 vdc common terminals.

[@realpars]

In the video, only one sensor is connected. If you have multiple sensors connected to the PLC card, external terminal blocks will be required. If you have a 16-point input card, there will ultimately be 16 connections to 24 COM. In this case, I would take 17 DIN-rail terminal blocks, jumper them together, connect the input common wires to the first 16 terminal blocks (one per block), and connect the 17th terminal block to 24 COM.

[@jawadkhan6531]

Connect two wire riela

[@jay_rana]

What will be the connection for npn switch?

[@realpars]

Watch this kzbin.info/www/bejne/aKHHp6mnoMyod5Y

[@sattara6901]

RealPars this link dosn't work

[@realpars]

Hey! I just checked the link kzbin.info/www/bejne/aKHHp6mnoMyod5Y and it works fine. Can you please try again? :)

[@scottsommer6480]

In the video linked at kzbin.info/www/bejne/aKHHp6mnoMyod5Y, start watching at about 6:30 for the discussion of wiring of an NPN device.

[@ieight8234]

blue wire is -24v? so potential difference between blue and brown (+24v) is 48v? 😉

[@scottsommer6480]

The blue wire is common, or the negative side of the 24VDC power supply. The voltage difference between +24VDC and what is shown as -24VDC (common) is 24VDC.

[@jeremyk2173]

@@scottsommer6480 the difference between +24 and -24 is 48v. The blue wire is 0v, not -24v

[@scottsommer6480]

@@jeremyk2173 Technically, yes.

[@suhail8086123757]

Wonderful videos

[@pradippatole1328]

plz share video related to potential free contact and wetted contact

[@realpars]

Glad to have you as a subscriber! :)

[@alhassanalmusawy2056]

thanks,and please keep going

[@realpars]

You are very welcome! Thanks for your support!

[@charliechimples]

Great vid once again, well explained. 🐵

[@realpars]

Thanks a lot!

[@3498137]

Excellent¡

[@realpars]

Thank you!

[@runbou3485]

Thankអរគុណ👏

[@samisrour3129]

great videos.. hope to be fine

[@grow8151]

Very good

[@amilabalasooriya8944]

Thanks.keep going

[@realpars]

Thanks for watching!

[@suhelpatel2028]

Beautiful 👌

[@GRant16NCH]

Make vedio.. different connection AI, AO analog detection