Figure 2-15: Digital Inputs Connected To Current Sourcing (Pnp) Devices; Figure 2-16: Digital Inputs Connected To Current Sinking (Npn) Devices - Aerotech Automation1 SI4 Series Hardware Manual

Stepper controller
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2.3.1. Digital Inputs
SI4 Hardware Manual
Each group of four inputs must be connected in an all sourcing or all sinking configuration.
Figure 2-15:
Digital Inputs Connected to Current Sourcing (PNP) Devices
Figure 2-16:
Digital Inputs Connected to Current Sinking (NPN) Devices
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