쉐도잉 연습: Sinking and Sourcing PLC Inputs Explained | What is the Difference? - 영상으로 영어 말하기 배우기
레슨 만드는 중...
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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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이 레슨의 어휘와 말하기 포인트
이 말하기 레슨은 영상 “Sinking and Sourcing PLC Inputs Explained”을(를) 바탕으로 합니다. 가장 자주 반복되는 단어는 다음과 같습니다: input, device, module, current, sourcing. 이 영상에는 섀도잉할 문장 83개와 단어 1146개가 있습니다. 말하는 구간의 길이는 8:30입니다. 화자는 분당 약 135단어의 일정한 속도로 말해서 섀도잉하기에 편한 속도입니다. 영어에서 가장 많이 쓰이는 3,000단어에 속하는 단어가 74%뿐이라 어휘가 어려운 편입니다.
이 영상의 핵심 어휘
영상에 나오는 익혀 둘 만한 단어 15개를 발음, 뜻과 함께 정리했습니다.
| 단어 | 발음 | 뜻 |
|---|---|---|
| module 명사 | /ˈmɑd͡ʒul/ | 모듈 |
| sink 동사 | /ˈsɪŋk/ | 가라앉다 |
| voltage 명사 | /ˈvəʊltɪd͡ʒ/ | 전압 |
| detect 동사 | /dɪˈtɛkt/ | 찾다, 탐지하다 |
| connect 동사 | /kəˈnɛkt/ | 잇다, 연결하다 |
| sensor 명사 | /ˈsɛn.sɚ/ | 센서 |
| vendor 명사 | /ˈvɛn.dɚ/ | 판매인, 판매자 |
| terminal 명사 | /ˈtɚmɪnəl/ | 터미널, 공항 터미널 |
| dependent 형용사 | /dɪˈpɛndənt/ | 종속의 |
| format 명사 | /ˈfɔːɹ.mæt/ | 포맷 |
| refer 동사 | /ɹɪˈfɜː/ | 언급하다 |
| label 명사 | /ˈleɪ.bəl/ | 라벨, 레이블 |
| wire 명사 | /ˈwaɪɚ/ | 철사 |
| explore 동사 | /ɪkˈsploɹ/ | 탐험하다 |
| correctly 부사 | /kəˈɹɛk(t).li/ | 정확(正確)히 |
따라 말해 볼 만한 문장
영상에 나오는 짧고 완결된 문장으로, 일상 대화에서 그대로 쓸 수 있습니다:
- 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.
주의할 발음
화자는 we'll, they're, we're 같은 축약형과 약화된 형태를 6번 사용합니다. 들리는 대로 짧게 발음하세요.
- “sh”와 “zh” 소리: conventional /kənˈvɛnʃənl̩/, confusion /kənˈfjuːʒən/, misconception /ˌmɪs.kənˈsɛp.ʃən/
- 긴 단어 — 강세 위치에 주의: proximity /pɹɒkˈsɪm.ɪ.ti/, polarity /pəˈlæɹɪti/, misconception /ˌmɪs.kənˈsɛp.ʃən/
한국어 화자가 어려워하는 소리:
- /f/ — ㅍ(/p/)으로 바꾸지 말고 윗니를 아랫입술에 대기: format /ˈfɔːɹ.mæt/, refer /ɹɪˈfɜː/, define /dɪˈfaɪn/, confusion /kənˈfjuːʒən/, differ /ˈdɪfɚ/
- /v/ — ㅂ(/b/)과 구별하기: voltage /ˈvəʊltɪd͡ʒ/, vendor /ˈvɛn.dɚ/, conventional /kənˈvɛnʃənl̩/, passive /ˈpæs.ɪv/, volt /vəʊlt/
- /r/과 /l/ 구별하기: recall /ɹɪˈkɔl/, explore /ɪkˈsploɹ/, correctly /kəˈɹɛk(t).li/, polarity /pəˈlæɹɪti/
이 영상으로 연습하는 방법
- 먼저 말하지 않고 영상을 끝까지 듣고 모르는 단어를 적어 둡니다.
- 보통 속도로 한 문장씩 섀도잉하고, 화자의 리듬과 맞을 때까지 반복합니다.
- 자신의 목소리를 녹음해 원본과 비교하고, module, sink, voltage 같은 단어에 특히 주의합니다.
쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법
쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.