How to Wire Discrete DC Sensors to PLC - Part 1

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How to Wire Discrete DC Sensors to PLC - Part 2 realpars.com/discrete-sensors...
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In this video, you will learn how to wire a 2-wire DC sensor, like a switch or a contact, to a PLC input card. You will also learn what a 2-Wire Discrete sensor is and recognize some of the common types of 2-Wire Discrete sensors.
DC sensors can be used to indicate the state of a device or a process to the PLC program. Knowing these input states can allow the PLC program to make decisions, such as, when to start or stop a pump.
Discrete DC Sensors, or discrete Direct Current sensors, operate in a circuit with a battery or other power source, commonly known as a power supply. A power supply is placed in an electrical circuit to provide power to the connected devices, like a switch, or a lamp. DC power supplies are referred to by their voltage and capacity, indicated by how many amperes they can supply. The more amperes a power supply can deliver, the larger and more expensive they generally are.
In DC PLC circuits, the power supply almost always supplies 24 Volts DC to the connected devices.
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Опубликовано:

3 июн 2018

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Комментарии : 130

@CosminRusu154 5 лет назад

The best channel for learning from basics! Thank you!

@realpars 5 лет назад

Thanks for your support! Happy to hear that.

@jackberi9584 4 года назад

The best free PLC/Automation training channel, thank you for sharing the knowledge

@realpars 4 года назад

Thanks a lot for your support, Jakup! Happy learning!

@unfilteredwithprakash6970 4 года назад

This is such a great channel, wish I could learn about some DCS from here.

@TT_S90 6 лет назад

This informative plc tutorial you have made and you always.

@albakhati5529 6 лет назад

RealPars thanks for these lectures

@realpars 6 лет назад

You're very welcome!

@dbv9018 4 года назад

Thank you for sharing your knowledge and your time for free. very useful and help me a lot.

@realpars 4 года назад

You are very welcome, Algen! Happy to hear that you are enjoying it!

@2stroke1971 3 года назад

Thank you. I am trying to fill some gaps in my knowledge. Manuals for the pieces I am playing with assume one already knows these fundamentals.

@javierferrer4634 5 лет назад

Good video thank you!

@mruhuji 5 лет назад

Great & informative video as always

@realpars 5 лет назад

Thank you! Happy learning.

@ricardoescobedo5420 2 года назад

The best automation channel! I will recommend it! , keep going with this excellent work =)

@realpars 2 года назад

Glad you enjoy it! Thanks a lot!

@damieke 5 лет назад

I'm happy to discover this channel... a bit too late though as I already had my plc exam but will help me with my future thesis for sure. Thank you

@realpars 5 лет назад

Great to hear, Damian! You are right, it is always helpful. We also have a free course on PLC Hardware if you haven't checked that out, yet. bit.ly/2Ml2gxR Happy learning!

@asareboadujackson7147 2 года назад

L L

@MJ-yu4ej Год назад

This is so useful. Thanks a lot!

@realpars Год назад

Glad it was helpful!

@73elperro Год назад

Thank you very much for sharing your knowledge!!🤠🥸🤓

@realpars Год назад

Glad it was helpful! You're more than welcome

@frat8385 5 лет назад

Thanks for this usefull video!

@realpars 5 лет назад

You're very welcome!

@richmond4884 3 года назад

Again thank you again for this imformative video

@realpars 3 года назад

You're very welcome, Richmond! Happy to hear that.

@user-wu1lp2lr6w 3 года назад

Thenk you. It's nice video..

@hiwaabdulrazaq7920 2 года назад

Good channel, thank you

@a.j.holland589 5 лет назад

SWEET VIDS

@ibrahimalabyed2576 6 лет назад

thanks

@ahmedbatesh693 4 года назад

Awesome video as always, thank you for this series of videos. Can you explain the operation of the selector switch with three states of operation and how to wire it in control panel please?

@realpars 4 года назад

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

@levoslumus2210 Год назад

Knowledge worth appreciating

@realpars Год назад

Thank you!

@DmitrySuvorov 2 года назад

It was very kind of you to do it. Thanks ever so much for your help. Greetings from Russia.

@realpars 2 года назад

You are very welcome!

@raeedshalabalsham6986 3 года назад

Thanks..It was really helpful

@realpars 3 года назад

Glad to hear that, Raeed!

@ravi-misra 4 года назад

Only channel for quality information in automation sector. Please make videos on PID diagrams, Electrical CAD softwares, Major Standard organizations and their popular standards, panel wiring conventions and best practices etc. Thanks

@realpars 4 года назад

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

@alirazi5960 3 года назад

Love and support for your Chanel

@realpars 3 года назад

Thanks a lot, Ali!

@ambrosiusshanyengange4313 5 лет назад

Very helpful

@realpars 5 лет назад

Great! Happy learning.

@user-rl8yb7tb1k 5 лет назад

Thanks a lot you are great

@realpars 5 лет назад

Thank you!

@MR-nl8xr 6 лет назад

Yes!

@darbarisid 5 лет назад

Nice 1..

@hiwaabdulrazaq7920 3 года назад

Thanks

@teddykurniawan3329 5 лет назад

Interest with this chanel

@visionnoweon 4 месяца назад

Gracias por el video

@realpars 4 месяца назад

De nada! Happy learning :)

@SB-dc9qb 2 года назад

Thank you

@realpars 2 года назад

Our pleasure, Shaun!

@fgrobot5505 5 лет назад

thanks bro

@realpars 5 лет назад

You're welcome!

@charliechimples 4 года назад

Great vid. Thanks for sharing. 🐵

@realpars 4 года назад

You are very welcome! Happy learning.

@TouChA0 6 лет назад

I want to know if there is a website can allowed me to get a certification in plc online

@user-ob7eb5sh5w 2 года назад

Great 👍👍👍👍❤️

@aboodkhoujaly7956 4 года назад

Realy great

@realpars 4 года назад

Thank you!

@1mSharkster 3 года назад

Its really great to have discovered this channel today. I'm doing a bit of a binge on everything you have on PCLs and learning a lot! One question - say you wanted to wire in both sensors in this video to the supply in channel 10, is that possible? If so, how would you go about doing this? Connect 10 to a terminal block with branching wires to each sensor?

@realpars 3 года назад

Yes to both questions. Simply run a wire from Terminal 10 to a block with 8 or 10-terminal blocks that can be used to distribute 24VDC (terminal 10) or for common (terminal 20).

@1mSharkster 3 года назад

@@realpars Okay great - thanks!

@alexguna1675 4 года назад

very nice

@realpars 4 года назад

Thank you, Alex!

@med2011larbi Год назад

I really appreciate your efforts to convey information in such a methodical way. Thank you very much. Quick question though, if the card terminals 2 to 9 are all supplied from 10(+24vdc), then the proximity switch terminals are both supplied with +24vdc terminals 10 and 5. 11:44

@realpars 11 месяцев назад

Terminal 10 supplies +24VDC to the switch. When the switch closes, it sinks the voltage to Terminal 5, which causes the input to go "true" (value of 1). The description at 9:36 may be a little misleading, as power "supplied" to Terminals 2 - 9 occurs only when wired to a switch and the switch closes. Hopefully, this makes it a little clearer.

@haroldbolambao3792 6 лет назад

just wow!:)

@realpars 5 лет назад

@eng.mohamedfandod1937 4 года назад

in polarized sensor i have + and - terminals what i had understood from the video is connect + terminal to + 24 of plc and ther other terminal of sensor to plc input for the same sensor can i connect the - terminal of the sensor to the - of plc and + terminal of the sensor to plc input ??

@realpars 4 года назад

With the right type of PLC card you can. You need a card that will source 24VDC at the PLC input terminals (a sourcing input card).

@eng.mohamedfandod1937 4 года назад

great

@realpars 4 года назад

Thank you!

@heatherrrenea 5 лет назад

@11:43 did you mean to say channel 5 instead of 3? Because in your schematic it appears to be channel 5 but you say 3? Sorry just trying to make sure I’m not missing something here. Thank you for all of your videos they are by far the best and simplest explanations I have located online with all of your videos! 👍👍👍

@realpars 5 лет назад

Hi there, Thank you for your compliments and happy to hear you found our videos useful. If you follow up the "Terminal D" wiring toward the card's "LED Indicators" you will see number 3, which is corresponding to channel 3 as it is mentioned in the video. The point is that, when you open up the card's door, you will see the "screw terminals" to which the wires are connected. The numbers beside the card at 11:43, from 1 to 20, are the numbers on the "Screw Terminals". Therefore, "Screw Terminal number 5" is corresponding to "channel number 3". For more clarification, you may want to search for this part number: 6ES7392-1AM00-0AA0 (40-pin Front connector for signal modules with screw contacts). Please let me know if you had further questions.

@juntahanronald4237 6 лет назад

Where we wire output cable, for example we have 2 wire sensor we connect the _ and + wire on the input but where is the output cable connected to run the motor or other device?

@realpars 6 лет назад

In this video, we show the connection of an input sensor, such as a switch. If you want to open a valve or start a motor based on the state of a discrete input, you would need to provide a discrete output card and the appropriate PLC logic to drive the output to the contactor or motor starter. See the RealPars video "Star-Delta Starter PLC Program and Wiring - Part 1" for more information.

@Uddan88 4 года назад

Can we provide external 24 volt power sourcing to the proximity switch?

@realpars 4 года назад

Yes, provided you have a 3-wire switch which requires a separate 24VDC input. Consult the wiring diagram for your specific device to see the options for supplying power. Be careful: all signal wires connected to a PLC input card needs to be on the same 24VDC circuit.

@KK-fh1ds 3 года назад

Do you have videos on the simatic s5 100u abd step 5?

@realpars 3 года назад

No, we do not. Sorry.

@danutlacatis8438 6 лет назад

HI. How is possible to recognize if a device is polarized o not ?? Thank you

@realpars 6 лет назад

Hi, you can read the manual.

@realpars 6 лет назад

Excellent question! You would normally have to consult the vendor's wiring drawing or other documentation. Also, polarized devices would normally label the "+" and "-" terminals on their device terminals in order to indicate the sensor is polarized. Often, the sensor will have a sticker or label indicating that the sensor must be wired in a particular way.

@kgauravb 6 лет назад

Please explain how two wire sensors work?? Thank you for all previous videos

@realpars 6 лет назад

2-wire sensors simply provide a contact-closure so that a complete circuit can be made. In the case of a PLC input, the switch allows current to flow from the positive terminal to common. What is not shown is the internal circuit which is activated when the switch is closed. That circuit is used to indicate that the discrete input is "made", or in terms of the PLC program, set to a value of ON or "1".

@nishantsheta2000 6 лет назад

why it is connected to terminal 10 because if 1 and 10 are positive then there is no current flow in any of the sensors...

@yassinehalli5986 11 месяцев назад

❤❤❤❤❤

@chessologypak786 3 года назад

❤️❤️❤️❤️

@jamalhossain7744 4 года назад

Sir, can you please also post a video about how Analog sensors can be wired ???

@realpars 4 года назад

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

@jamalhossain7744 4 года назад

@@realpars ..Thank you so much sir...I will be waiting for your video

@abbauhammer5452 10 месяцев назад

What about the other Inputs B-H? the terminal block get 24V from 10, bridged A+ to H+ ? Or more likely from the power module that supply the plc?

@realpars 10 месяцев назад

Thank you for your inquiry. Firstly, I'd like to clarify that the card we previously discussed is an input card. In our video, timestamped at 12:47, we provide a detailed guide on how to correctly wire this card. To power it, you should connect it to a +24 VDC source. This can be achieved by either using terminal 10, as demonstrated in the video, or by directly connecting it to the main power supply's +24VDC output. The latter option should then be looped back to the input card via one of the terminals, as shown for the "A" terminal block in the video. Once your switch is activated, and you have programmed the logic in the PLC accordingly, the input card will respond as per your programming instructions. For further in-depth information and learning resources, please refer to the Siemens website. You can download the technical manual from the following link: Siemens Technical Manual Download support.industry.siemens.com/cs/document/109808766/s7-300-et-200m-automation-system-original-instructions?dti=0&lc=en-US We hope you find this information valuable for your learning journey. Happy learning from RealPars!

@abbauhammer5452 10 месяцев назад

So terminal 10 is designed and capable to supply all input terminals 2-9? In case you have 8 switches, you need a terminal block provides 24V 8 times, A+ 24V black wire and A input white wire, for example. Thx alot for your great work and fast answer, really really appreciate it.

@vasanthkumar-zy4yg 3 года назад

Please make video sink source in plc

@realpars 3 года назад

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

@luthfiaminulloh8177 3 года назад

How long is the maximum of sensor cable wiring?

@realpars 3 года назад

2-wire 24VDC discrete signals can be run up to 1000m, but it depends on a number of factors, like wire size and environmental conditions. You should be safe up to 100m with no issues.

@djl6692 4 года назад

I'm a little confused at 9:30 in the video. Why is the positive power internally wired to terminals 10 and 11? And why are terminals 2 through 9 negative? To be negative, don't they have to be internally connected to terminal 20?

@realpars 4 года назад

Terminals 2 - 9 are grounded internally (negative) through the backplane of the input card. Providing power to terminals 10 and 11 provides a means to isolate the first 8 inputs from the second 8 inputs. There is optical isolation inside the input card to provide this protection.

@erickontiveroslara209 6 лет назад

Very usefull, but I still have some questions: where comes the power from that feed the sensors?...is it taken from the input module? In the example of the pushbutton, wouldnt the conection betwen terminal 10 (+) and A( -) or any other terminal of the top 8 DI's make a short circuit when the button is pressed? I really didn't get this so well. And lastly what happens if we have a module filled with field devices if they have two polarized terminals? ...the common terminal (+ or -) from all the devices gets connected to the same terminal on the PLC, or Programmers or Electrical Engeneers get common from the PLC to a terminal block with some branches to distribut it there and make it easier and functional to wire the common from all sensors apart from the Input Module common terminals?

@juntahanronald4237 6 лет назад

Erick Ontiveros Lara you can watch his other video.

@realpars 6 лет назад

The 24 VDC power at the input card terminals is supplied by a separate power supply. For the inputs, the internal circuitry of the input card provides the necessary load to prevent the closing of the switch from creating a short circuit. The internal circuitry senses the switch has been closed, and writes a "1" to the input card's data table.

@realpars 6 лет назад

Yes, the video shows the connection of one sensor to the PLC input card. If you have a "full card" with 8 or 16 sensors, you would use a set of external terminal blocks to connect the common wire.

@erickontiveroslara209 6 лет назад

Thanks a lot for the feedback, I think I do understand better now. Regards!

@arinzembah7540 Год назад

How come the red wire of the photoelectric switch is connected to terminal 10 instead of the terminal block? I thought terminals 10, 11 and 20 were for the negative terminals of the power supply.

@realpars Год назад

Terminals 1, 10, and 11 are +24VDC. Terminal 20 is Common. At 11:47 in the video, you can see that power is supplied via the red wire and connected to the corresponding PLC input terminal via the black wire. Whenever connecting devices to a PLC card, consult the PLC I/O card documentation to determine how the device should be wired. A PLC card can many times support many different types of devices, so consulting the documentation is usually required.

@samuelmoreno3255 4 года назад

Not too sure if I’m asking the question correctly but today I ran a circuit to a filler and I figured I was going to be pulling a blue+ and a blue/white- wire but he told me no you were supposed to pull two blue wires a common and a signal what is the difference?

@realpars 4 года назад

The only difference is the color of the wire sheath. One wire, regardless of color, will be the positive (+) or signal wire and the other will be connected to common. There is a lot of disagreemet as to the "proper" colors for discrete 24VDC signals. The two schemes that seem to be best aligned with UL508 (a standard) and NFPA79 (a code) are blue (+) / white with blue stripe (COM) - and - blue / blue.

@renegadeflower575 6 лет назад

I'm assuming the sensors are not transistor based.

@realpars 6 лет назад

You are correct. See the comment above to your first question. Transistor type switches are normally 3-wire switches and must be wired differently. See "How to Wire Discrete DC Sensors to PLC - Part 2".

@omaressoli3835 2 года назад

Thank you, how can I translate into French because I do not understand English

@realpars 2 года назад

Hi Omaro, Thanks for your comment! We currently only provide our course videos in English, you are always able to turn on the English subtitles as that might make it a bit easier for you. Our apologies for any inconvenience! Happy learning!

@vishveshpatel3932 3 года назад

Somebody explain me why one wire of sensor connected to terminal 10? Shouldn't it be connected to ground?

@realpars 3 года назад

Terminal 10 supplies +24VDC to the circuit. The "signal" or input wire is connected to terminals 2 - 9, where input 0 is connected to terminal 2 and input 7 is connected to terminal 9. Ground is provided as a common ground point for the entire card, through terminal 20.

@danutlacatis8438 6 лет назад

i mean a sensor

@renegadeflower575 6 лет назад

Thanks for letting me know. I thought sensors always had more than 2 wires.

@realpars 6 лет назад

Many sensors do have multiple wires, including the ones described in the RealPars video "How to Wire Discrete DC Sensors to PLC - Part 2". Many proximity switches are "contact closures" which only require 2 wires. Hall effect sensors (magnetic switches) used in many pneumatic valves as position switches are 2-wire sensors. Electromechanical switches, such as rocker switches, are 2-wire sensors.