plc sinking vs sourcing

Sourcing input cards need a fuse between the sensor (as voltage source) and PLC input terminals to prevent PLC or power supply damage if a short to ground develops from, for example, a wire break. While matching a sourcing or sinking output to the opposite input type is ideal, trying to connect same-type inputs and outputs isn't a reason for ... A sinking PLC DI is suitable for PNP field sensor devices and looks for +24 Vdc on the DI channel coming from the sensor switched lead to indicate a logical true condition. A sourcing PLC DI is suitable for

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