plc sinking vs sourcing

All of the PLC 24 Vdc digital input modules were NPN (sourcing 24 V dc) and our plant's standard is PNP inputs (sinking 24 Vdc inputs). These signal levels (sourcing input module with sinking sensor vs. sinking input with sourcing sensor) seem like they will double the number of input modules and sensor spare parts we stock. We need to Sinking and Sourcing: PLC has input and output lines through which it connects to a directing system. The inputs can be keys, switches, sensors, while the outputs are directed to different devices, from simple signalling lights to complex communication modules.

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