Shadowing Practice: Sinking and Sourcing PLC Inputs Explained | What is the Difference? - Learn English Speaking with Video
Les maken...
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In this video, we're going to talk about syncing and sourcing PLC digital input modules and how they're connected to field devices.
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We will be using a Siemens digital input module with this part number.
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If you want to order this module online, you can head on over to the RealPars Marketplace or simply click on this link here.
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The two types of PLC input modules are digital and analog.
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A digital input module accepts inputs from digital devices such as switches and proximity sensors.
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The input module will detect one of the two possible conditions of an input device, open or closed.
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For example, a push -button switch is a digital device and can either be open or closed.
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We will examine how the input module detects the input device condition later in this video.
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The focus of our video is on digital input modules.
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Okay, let's go.
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As we said earlier, a digital input module will detect one of the two possible conditions of an input device, open or closed.
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So, the question is, how does the input module know if the input device is open or closed?
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All we need to do is construct a closed circuit containing the input device,
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the PLC input module, and a 24 volt DC power supply.
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If the switch is open, there is 0 volts at the module input terminal.
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If the switch is closed, there is a positive 24 volts at the module input terminal.
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The input module will detect either a no voltage or voltage condition at the input.
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These voltage conditions represent the open or closed conditions of the switch.
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These voltage or non -voltage conditions are represented by ones and zeros in the PLC memory.
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Every input device is connected the same way.
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If you have a 64 input module, it's possible to have 64 separate circuits.
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We'll show you more examples later.
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Alright, now that we know how the digital input module determines the input device condition,
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let's talk about the current flow between the power supply and the input module.
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There is a current flow, but it is very small and usually under 10 milliamps.
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Notice in our example that the current is flowing into the PLC module.
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Depending on the type of PLC input module and how it's connected with the input device, the current could flow in or out of the module.
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That's where the terms sinking and sourcing come into the picture.
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Let's spend some time clearing up any misconceptions you might have about these terms.
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When we talk about sinking and sourcing, it's all about defining the direction of conventional current flow between two devices.
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Think of it this way, current is flowing between device number 1 and device number 2.
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Ask yourself, which direction is the current flowing?
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The current is flowing from device number 1 to device number 2.
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Therefore, we say device number 1 is sourcing the current, and device number 2 is sinking the current.
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Okay, what if the current is flowing from device number two to device number one?
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In this case, we say device number two is sourcing the current, and device number one is sinking the current.
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In every situation where you have a current flow between two devices, one of the devices will be sourcing and the other will be sinking.
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PLC vendors manufacture both sinking and sourcing digital input modules.
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Let's explore what they are and how they differ.
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Remember what we discussed earlier, it's all about the direction of conventional current flow.
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Let's have a look at two devices with current flowing between them.
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One device is a PLC input module, and the second device is a push -button switch.
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Based on the connection polarity, the syncing module will have the current flowing into it from the switch.
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Ok, let's do that again, but this time our PLC input module will be a sourcing module.
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Based on the connection polarity, the sourcing module will have the current flowing out of it.
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Current can flow in either direction through a push -button switch because it is a passive device and not polarity -dependent.
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There are many active digital input devices used in industry today that are polarity -dependent.
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They must be wired correctly or they will not work at all.
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These active devices will be labeled as either syncing or sourcing.
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You can learn more about active sensors in our other videos.
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We'll direct you there at the end of this video.
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If you recall, earlier we said that when there are two devices with current flowing between them, one device will be sourcing and one will be syncing.
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If the input device is a sourcing type, the PLC input module must be a syncing type.
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If the input device is a syncing type, the PLC input module must be a sourcing type.
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Adding confusion to already murky concepts,
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some vendors refer to syncing and sourcing input devices as NPN and PNP.
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You can learn more about NPN and PNP in our other videos.
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We'll direct you there at the end of this video.
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Here's something to remember.
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An NPN device is a syncing device.
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A PNP device is a sourcing device.
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The Siemens Digital Input Module 6ES7521 -1BH50 -0AA0 is a sourcing type.
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If you want to order this PLC module to use in your project, you can find the link in the video description.
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Let's connect a push -button switch and a syncing proximity sensor to two of the inputs.
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The current is flowing out of the PLC module because it is a sourcing type.
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Let's have a look at a syncing module.
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The Phoenix Contact Digital Input Module AXLSEDI16 -1 is a syncing type.
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You can find the link to order this PLC module in the video description as well.
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Let's connect a push -button switch and a sourcing proximity sensor to two of the inputs.
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The current is flowing into the PLC module because it is a syncing type.
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If you want to learn more, you might want to review two of our other videos called
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How to Wire Discrete DC Sensors to PLC Part 2 and What is a Transistor Working Principles.
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You can find the links to these videos in the description.
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Ok, let's review what we've covered in this video.
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A digital input module will detect one of the two possible conditions of an input device, open or closed.
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Digital input modules detect either a no voltage or voltage condition at the input.
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A sinking input module will have the current flowing into it.
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A sourcing input module will have the current flowing out of it.
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PLC vendors offer both syncing and sourcing digital input modules.
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An NPN device is a syncing device.
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A PNP device is a sourcing device.
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Want to learn PLC programming in an easy -to -understand format
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and take your career to the next level? head on over to realpars .com
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Woordenschat en spreektips bij deze les
Deze spreekles is gebaseerd op de video “Sinking and Sourcing PLC Inputs Explained”. Deze woorden komen het vaakst terug: input, device, module, current, sourcing. Deze video bevat 83 zinnen en 1146 woorden om na te spreken. Het gesproken deel duurt 8:30. De spreker praat in een gelijkmatig tempo van ongeveer 135 woorden per minuut, prettig om te shadowen. Slechts 74% van de woorden hoort bij de 3.000 meest gebruikte Engelse woorden, dus de woordenschat is pittig.
Belangrijke woorden in deze video
15 woorden uit de video die het leren waard zijn, met uitspraak en betekenis:
| Woord | Uitspraak | Betekenis |
|---|---|---|
| module zelfstandig naamwoord | /ˈmɑd͡ʒul/ | module |
| sink werkwoord | /ˈsɪŋk/ | zinken, onderdompelen |
| voltage zelfstandig naamwoord | /ˈvəʊltɪd͡ʒ/ | spanning |
| detect werkwoord | /dɪˈtɛkt/ | detecteren |
| connect werkwoord | /kəˈnɛkt/ | verbinden |
| proximity zelfstandig naamwoord | /pɹɒkˈsɪm.ɪ.ti/ | nabijheid |
| vendor zelfstandig naamwoord | /ˈvɛn.dɚ/ | leverancier |
| dependent bijvoeglijk naamwoord | /dɪˈpɛndənt/ | afhankelijk |
| conventional bijvoeglijk naamwoord | /kənˈvɛnʃənl̩/ | conventioneel |
| format zelfstandig naamwoord | /ˈfɔːɹ.mæt/ | lay-out, formaat |
| refer werkwoord | /ɹɪˈfɜː/ | verwijzen, doorverwijzen |
| label zelfstandig naamwoord | /ˈleɪ.bəl/ | etiket, label |
| wire zelfstandig naamwoord | /ˈwaɪɚ/ | draad |
| define werkwoord | /dɪˈfaɪn/ | bepalen, determineren |
| explore werkwoord | /ɪkˈsploɹ/ | onderzoeken, bestuderen |
Zinnen om te herhalen
Korte, volledige zinnen uit de video die je in alledaagse gesprekken kunt gebruiken:
- We'll show you more examples later.
- Let's explore what they are and how they differ.
- Let's have a look at a syncing module.
Uitspraak om op te letten
De spreker gebruikt 6 samentrekkingen en verkorte vormen, zoals we'll, they're, we're. Spreek ze kort uit, zoals je ze hoort.
- De klanken “sh” en “zh”: conventional /kənˈvɛnʃənl̩/, confusion /kənˈfjuːʒən/, misconception /ˌmɪs.kənˈsɛp.ʃən/
- Lange woorden — let op de klemtoon: proximity /pɹɒkˈsɪm.ɪ.ti/, polarity /pəˈlæɹɪti/, misconception /ˌmɪs.kənˈsɛp.ʃən/
Klanken die Nederlandstaligen lastig vinden:
- Stemhebbende eindmedeklinker — /b/, /d/, /g/, /z/, /v/ niet verscherpen: voltage /ˈvəʊltɪd͡ʒ/, depend /dɪˈpɛnd/, passive /ˈpæs.ɪv/, analog /ˈænəlɔɡ/
- /æ/ — opener dan de Nederlandse “e”: format /ˈfɔːɹ.mæt/, examine /ɪɡˈzæmɪn/, passive /ˈpæs.ɪv/, analog /ˈænəlɔɡ/, polarity /pəˈlæɹɪti/
- /g/ — een harde plofklank, geen Nederlandse “g”: examine /ɪɡˈzæmɪn/, analog /ˈænəlɔɡ/
Zo oefen je met deze video
- Luister de hele video één keer zonder te spreken en noteer de woorden die je niet kent.
- Spreek zin voor zin na op normale snelheid en herhaal elke zin tot je ritme gelijk is aan dat van de spreker.
- Neem jezelf op en vergelijk met het origineel; let daarbij op woorden als module, sink, voltage.
Wat is de Shadowing-techniek?
Shadowing is een wetenschappelijk onderbouwde taalleermethode die oorspronkelijk is ontwikkeld voor professionele tolkentraining en gepopulariseerd door polyglot Dr. Alexander Arguelles. De methode is eenvoudig maar krachtig: je luistert naar native Engelse audio en herhaalt het onmiddellijk hardop — als een schaduw die de spreker volgt met slechts 1–2 seconden vertraging. In tegenstelling tot passief luisteren of grammaticadrills, dwingt shadowing je hersenen en mondspieren om echte spraakpatronen tegelijkertijd te verwerken en te reproduceren. Onderzoek toont aan dat het de uitspraaknauwkeurigheid, intonatie, ritme, verbonden spraak, luisterbegrip en spreekvaardigheid aanzienlijk verbetert — waardoor het een van de meest effectieve methoden is voor IELTS Speaking-voorbereiding en echte Engelse communicatie.