Delta CFP2000 Series User Manual page 78

When the photo-coupler is using internal power supply, the switch connection for Sink

and Source as below:
MI-DCM: Sink mode
MI-+24V: Source mode
When the photo-coupler is using external power supply, please remove the short circuit

cable between the +24V and COM terminals. The connection mode is Sink mode or
Source mode according to the below:
The "+" of 24V connecting to COM: Sink mode
The "-" of 24V connecting to COM: Source mode
Chapter 6 Control TerminalsCFP2000
6-3