Sinking and Sourcing PLC Outputs Explained

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▶ C'mon over to https://realpars.com where you can learn PLC programming faster and easier than you ever thought possible! • ============================= • ▶ Check out the full blog post over at • https://realpars.com/sinking-output/ • ============================= • ⌚Timestamps: • 00:00 - Intro • 00:56 - Sinking and sourcing • 02:17 - PLC digital output modules • 02:32 - 1) Sinking output modules • 02:49 - 2) Sourcing output modules • 03:20 - PNP and NPN modules • 04:45 - MOSFET modules • 05:05 - Siemens 8 DO transistor module • 05:38 - A quick way to identify sinking or sourcing • ============================= • In this video, we’re going to talk about Sinking and Sourcing PLC digital output modules and how they connect to field devices. • Digital output modules can be Solid State or dry Relay. • The purpose of a PLC Digital Output module is to operate or control a DC voltage physical device based on field device conditions connected to an input module and decisions made by the PLC program. • When we talk about sinking and sourcing, it’s all about defining the direction of conventional current flow between 2 devices. • Think of it this way… Current is flowing between Device #1 and Device #2. • Which direction is the current flowing? • The current is flowing from Device #1 to Device #2. Therefore we say Device #1 is Sourcing the current, and Device #2 is Sinking the current. • What if the current was flowing from Device #2 to Device #1? • In this case, we say Device #2 is Sourcing the current, and Device #1 is Sinking the current. • In every situation where you have a current flow between 2 devices, one of the devices will be Sourcing and the other will be Sinking. • 1) Sinking output modules • Let’s have a look at 2 devices with current flowing between them. One device is a PLC Output Module, and the 2nd device is a relay. • Based on the connection polarity, the Sinking module will have the current flowing into it from the load. • 2) Sourcing output modules • Let’s do that again, but this time one of our devices will be a Sourcing module. Based on the connection polarity, the sourcing module will have the current flowing out of it and into the load. • If you recall, earlier we said that when there are 2 devices with current flowing between them, one device will be sourcing and one will be sinking. • Sometimes adding confusion to already murky concepts, some vendors refer to Sinking and Sourcing outputs as NPN and PNP outputs. • An NPN Module is a Sinking module • A PNP Module is a Sourcing module • Why are the names PNP and NPN used? • Whether it’s sinking or sourcing, an output module must act as a closed switch to complete the circuit. • In many output modules the actual switching is performed by Bipolar Junction Transistors (BJTs): • In a Sinking module, the transistor is an NPN • In a Sourcing module, the transistor is a PNP • The current flows into a sinking module and out of a sourcing module. • If a PLC output module is listed as an NPN type, you can be sure that it is a Sinking type. But, if a PLC module is listed as a Sinking type, it may or may not be an NPN type. • Many vendors use other solid state devices such as MOSFETs to perform the switching. • For example, we have the following Sinking and Sourcing modules: • 6ES7322-1BP50-0AA0 https://bit.ly/3XCf6hC • 6ES7322-1BP00-0AA0 https://bit.ly/44vvP8x • Unless we dig deeper, we can’t know for sure what type of switching device is used. • The Siemens 6ES7322-1BF01-0AA0 (https://bit.ly/3JKhWeR) is an 8 output Transistor Output Module. • This output module is a Sourcing module as the current flows out of the module and into the loads. • If this module is incorrectly wired as a Sinking module, it will not operate. • Is there a quick way to identify if a module is sinking or sourcing? • If the wired-together load terminals connect to the plus terminal of the power supply, you have a Sinking module. • If the wired-together load terminals connect to the negative terminal of the power supply (ground), you have a Sourcing module. • ============================= • To learn more, you might want to review our other articles: • PLC Digital Output Types | Solid State vs Relay https://realpars.com/plc-output/ • PLC Hardware Explained https://realpars.com/plc-hardware/ • ============================= • Missed our most recent videos? Watch them here: • https://realpars.com/instrument-calib... • https://realpars.com/plcnext-starterkit • https://realpars.com/motor-starter • ============================= • To stay up to date with our last videos and more lessons, make sure to subscribe to this YouTube channel: • http://bit.ly/realpars • ============================= • TWEET THIS VIDEO https://ctt.ac/sc4NT • ============================= • Follow us on Facebook: / therealpars • Follow us on Twitter: / realpars • Follow us on LinkedIn / realpars • Follow us on Instagram / realparsdotcom • #RealPars #Industry #automationengineer

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