跟讀練習: Sinking and Sourcing PLC Inputs Explained | What is the Difference? - 通過影片學習英語口語
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83 句
如果句子過短或過長，請點選 Edit 進行調整。
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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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本課的詞彙與口語要點
這節口語課以影片“Sinking and Sourcing PLC Inputs Explained”為素材。 影片中反覆出現的詞有：input, device, module, current, sourcing。 這段影片共有 83 個句子、1146 個單詞可供跟讀。 講話部分時長為 8:30。 說話人語速平穩，每分鐘約 135 個詞，很適合跟讀。 只有 74% 的單詞屬於英語最常用的 3,000 詞，詞彙難度較高。
影片中的重點詞彙
影片中 15 個值得學習的單詞，附發音和釋義：
| 單詞 | 發音 | 釋義 |
|---|---|---|
| input 名詞 | /ˈɪnpʊt/ | 輸入 /輸入 |
| module 名詞 | /ˈmɑd͡ʒul/ | 模組 /模組 |
| sink 動詞 | /ˈsɪŋk/ | 沉, 下沉 |
| voltage 名詞 | /ˈvəʊltɪd͡ʒ/ | 電壓 /電壓 |
| detect 動詞 | /dɪˈtɛkt/ | 察覺 /察覺, 發覺 /發覺 |
| connect 動詞 | /kəˈnɛkt/ | 連線 /連線 |
| sensor 名詞 | /ˈsɛn.sɚ/ | 感測器 /感測器 |
| proximity 名詞 | /pɹɒkˈsɪm.ɪ.ti/ | 接近 |
| vendor 名詞 | /ˈvɛn.dɚ/ | 賣主 /賣主, 賣家 /賣家 |
| terminal 名詞 | /ˈtɚmɪnəl/ | 航站, 航廈 /航廈 |
| dependent 形容詞 | /dɪˈpɛndənt/ | 依靠, 倚賴 /倚賴 |
| conventional 形容詞 | /kənˈvɛnʃənl̩/ | 協定的 |
| format 名詞 | /ˈfɔːɹ.mæt/ | 格式, 開本 /開本 |
| refer 動詞 | /ɹɪˈfɜː/ | 談到 /談到 |
| label 名詞 | /ˈleɪ.bəl/ | 標籤 /標籤, 簽條 /籤條 |
值得反覆跟讀的句子
影片中簡短而完整的句子，可以直接用在日常對話裡：
- 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.
需要注意的發音
說話人用了 6 次縮略和弱讀形式，例如 we'll, they're, we're。請按聽到的簡短形式來說。
- “sh” 和 “zh” 音: conventional /kənˈvɛnʃənl̩/, confusion /kənˈfjuːʒən/, misconception /ˌmɪs.kənˈsɛp.ʃən/
- 長單詞——注意重音位置: proximity /pɹɒkˈsɪm.ɪ.ti/, polarity /pəˈlæɹɪti/, misconception /ˌmɪs.kənˈsɛp.ʃən/
中文母語者容易讀錯的音：
- /v/ — 不要讀成 /w/，上齒輕觸下唇: voltage /ˈvəʊltɪd͡ʒ/, vendor /ˈvɛn.dɚ/, conventional /kənˈvɛnʃənl̩/, passive /ˈpæs.ɪv/, volt /vəʊlt/
- 詞尾子音 — 要讀清楚，後面不要加母音: input /ˈɪnpʊt/, sync /sɪŋk/, sink /ˈsɪŋk/, voltage /ˈvəʊltɪd͡ʒ/, detect /dɪˈtɛkt/
- /r/ 和 /l/ 的區別: recall /ɹɪˈkɔl/, explore /ɪkˈsploɹ/, correctly /kəˈɹɛk(t).li/, polarity /pəˈlæɹɪti/
如何用這段影片練習
- 先完整聽一遍影片，不要開口，記下不認識的單詞。
- 用正常速度逐句跟讀，每句重複到你的節奏與說話人一致為止。
- 錄下自己的聲音並與原聲對比，特別注意 input, module, sink 這類單詞。
什麼是跟讀法？
跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。