NVF5 Series User Manual Chapter 3 Installation and Wiring
（2） Source pole（Sink pole）mode，using internal +24V power supply of the inverter，
PLC is NPN type and common emitter type mode.
Figure 3-6-2 Using Inverter Internal +24V Power Supply Connecting Mode
3.6.2 Multifunctional DO Terminal Using Description
（1） HDO is used as digital pulse frequency output，can be connected with inverter
internal +24V power supply，refer to figure3-6-3：
Figure 3-6-3 HDO Connection Mode1
（2） HDO is used as digital pulse frequency output，also can be connected with
external power supply，refer to figure3-6-4
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