Delta MS300 Series User Manual page 50

 When the photo coupler uses the internal power supply, the switch connection for
Sink and Source modes shows as Figure 6-2 and Figure 6-3: MI-DCM: Sink mode;
MI-+24 V : Source mode.
DC
Transistor output terminals (MO1, MO2, MCM)
 Connect the digital outputs to the correct polarity.
 When connecting a relay to the digital outputs, connect a surge absorber across the
coil and check the polarity.
Chapter 6 Control TerminalsMS300
41