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Sinking and Sourcing PLC Outputs Explained ▶ Check out the full blog post over at https://realpars.com/sinking-output/ 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.