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Wiring Your I/O Modules
Sourcing Device with Sinking Output Module Circuit

TM-5-3895-374-24-1 Paving Machine Bituminous Material: Crawler Mounted Diesel Engine Driven Manual
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TM 5-3895-374-24-1 Chapter 6 Wiring Your I/O Modules Contact Output Circuits - AC or DC Relays can be used for either AC or DC output circuits and accommodate either sinking or sourcing field devices.  These capabilities are a result of the output switch being a mechanical contact closure, not sensitive to current flow direction and capable of accommodating a broad range of voltages. This high degree of application flexibility makes contact output modules very popular and useful in control environments with a broad mix of electrical I/O circuit requirements. Solid-State DC I/O Circuits The design of DC field devices typically requires that they be used In a specific sinking or sourcing circuit depending on the internal circuitry of the device DC input and output field circuits are commonly used with field devices that have some form of internal solid state circuitry that need a DC signal voltage to function. Sourcing Device with Sinking Input Module Circuit The field device is on the positive side of the power supply between the supply and the input terminal When the field device Is activated, it sources current to the input circuit. (page 3-418







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