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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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Comments

    • abdo boulanouar
      abdo boulanouar

      Thanks a lot you are great

      about 13 days ago
    • RealPars
      RealPars In reply to abdo boulanouar

      Thank you!

      about 12 days ago
    • MIKE MWABILWA
      MIKE MWABILWA

      thanks

      about 13 days ago
    • RealPars
      RealPars In reply to MIKE MWABILWA

      Happy learning!

      about 13 days ago
    • sid86
      sid86

      Nice 1..

      about 1 month ago
    • movw wvom
      movw wvom

      The best channel for learning from basics! Thank you!

      about 3 months ago
    • RealPars
      RealPars In reply to movw wvom

      Thanks for your support! Happy to hear that.

      about 3 months ago
    • Nappy Vids
      Nappy Vids

      @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! 👍👍👍

      about 5 months ago
    • RealPars
      RealPars In reply to Nappy Vids

      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.

      about 5 months ago
    • yanuar teddy
      yanuar teddy

      Interest with this chanel

      about 5 months ago
    • Damian K
      Damian K

      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

      about 5 months ago
    • RealPars
      RealPars In reply to Damian K

      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. https://bit.ly/2Ml2gxR

      Happy learning!

      about 5 months ago
    • arron holland
      arron holland

      SWEET VIDS

      about 5 months ago
    • Ambrosius Shanyengange
      Ambrosius Shanyengange

      Very helpful

      about 7 months ago
    • RealPars
      RealPars In reply to Ambrosius Shanyengange

      Great! Happy learning.

      about 7 months ago
    • JOJO RAVZ
      JOJO RAVZ

      thanks

      about 7 months ago
    • mruhuji
      mruhuji

      Great & informative video as always

      about 8 months ago
    • RealPars
      RealPars In reply to mruhuji

      Thank you! Happy learning.

      about 8 months ago
    • Kevin g
      Kevin g

      11:43 what do you mean connecting to import channel 3 when it looks like you're going to input Channel 5?

      about 8 months ago
    • Ardent Dfender
      Ardent Dfender In reply to Kevin g

      I’m gonna try my best to even simplify it it if I’m correct. As this used to confuse the hell out of me when I was first working with PLC modules, I/Os and control panel drawings. I think an actual control panel module drawings of wiring for I/Os could help here. Still excellent video though. Anyway if you ever look at say an Allen Bradley Input/Output module for a 16 Channel Card their are actually 20 Screw Terminals. 4 Terminals are for the power in how it’s looped to the cards. Power input to card on Chanel 1, fed to devices from terminal 10 for devices at top of card. Then power on terminal 11 and 20. Terminal 11 feed power to devices. But I think its connected or goes to negative common from 20 for the card. Someone can correct me on that part maybe. So those are the four terminals associated with power feed on the module. The other 16 screw terminals are actually wired to devices and those are actually numbered from 0 to 15 for channels. Thus from the video and time you referenced in question screw terminal 5 is actually Channel 3. The module Chanel’s are counted from 0, 1, 2, 3 etc to 15. I hope I said that correct. Because it used to confuse me as well. What you often don’t see is that there is internal wiring to each of the screw terminals on module. Some for power a few, the others are for input/ output to devices.

      about 2 months ago
    • RealPars
      RealPars In reply to Kevin g

      Hi there,

      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).

      about 5 months ago
    • Nappy Vids
      Nappy Vids In reply to Kevin g

      Kevin g, I was wondering same thing? Did you ever figure this out?

      about 5 months ago
    • Fırat Isler
      Fırat Isler

      Thanks for this usefull video!

      about 9 months ago
    • RealPars
      RealPars In reply to Fırat Isler

      You're very welcome!

      about 9 months ago
    • fg robot
      fg robot

      thanks bro

      about 9 months ago
    • RealPars
      RealPars In reply to fg robot

      You're welcome!

      about 9 months ago
    • Ilham Romadhoni
      Ilham Romadhoni

      mantap hehe

      about 10 months ago
    • Javier Ferrer
      Javier Ferrer

      Good video thank you!

      about 10 months ago
    • harold bolambao
      harold bolambao

      just wow!:)

      about 11 months ago
    • RealPars
      RealPars In reply to harold bolambao

      :)

      about 10 months ago
    • nishant sheta
      nishant sheta

      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...

      about 11 months ago
    • Juntahan Ronald
      Juntahan Ronald

      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?

      about 11 months ago
    • RealPars
      RealPars In reply to Juntahan Ronald

      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.

      about 11 months ago
    • Ibrahim Alabyed
      Ibrahim Alabyed

      thanks

      about 11 months ago
    • Erick Ontiveros Lara
      Erick Ontiveros Lara

      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?

      about 11 months ago
    • Erick Ontiveros Lara
      Erick Ontiveros Lara In reply to Erick Ontiveros Lara

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

      Regards!

      about 11 months ago
    • RealPars
      RealPars In reply to Erick Ontiveros Lara

      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.

      about 11 months ago
    • RealPars
      RealPars In reply to Erick Ontiveros Lara

      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.

      about 11 months ago
    • Juntahan Ronald
      Juntahan Ronald In reply to Erick Ontiveros Lara

      Erick Ontiveros Lara you can watch his other video.

      about 11 months ago
    • anogout mohamed
      anogout mohamed

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

      about 1 year ago
    • MOHAMED ALI MASSIDI
      MOHAMED ALI MASSIDI

      thanks

      about 1 year ago
    • RealPars
      RealPars In reply to MOHAMED ALI MASSIDI

      Welcome!

      about 1 year ago
    • Gaurav Kumar
      Gaurav Kumar

      Please explain how two wire sensors work??

      Thank you for all previous videos

      about 1 year ago
    • RealPars
      RealPars In reply to Gaurav Kumar

      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".

      about 11 months ago
    • Renegade Flower
      Renegade Flower

      I'm assuming the sensors are not transistor based.

      about 1 year ago
    • RealPars
      RealPars In reply to Renegade Flower

      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".

      about 11 months ago
    • danut lacatis
      danut lacatis

      i mean a sensor

      about 1 year ago
    • Renegade Flower
      Renegade Flower

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

      about 1 year ago
    • RealPars
      RealPars In reply to Renegade Flower

      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.

      about 11 months ago
    • danut lacatis
      danut lacatis

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

      about 1 year ago
    • RealPars
      RealPars In reply to danut lacatis

      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.

      about 11 months ago
    • RealPars
      RealPars In reply to danut lacatis

      Hi, you can read the manual.

      about 1 year ago
    • Ahmed Abu rukaiah
      Ahmed Abu rukaiah

      RealPars thanks for these lectures

      about 1 year ago
    • RealPars
      RealPars In reply to Ahmed Abu rukaiah

      You're very welcome!

      about 1 year ago
    • Max R
      Max R

      Yes!

      about 1 year ago