Delta Electronics DVP15MC11T Operation Manual page 46

Chapter 6 Wiring, Communication Setting and Network Construction
D VP1 5MC11T
圖 3.2.6
 DC power supply of 24 V
 Circuit protection fuse
 Emergency stop button
 Switch, inductive load
 component for suppression ( is not used but  when in smaller power ).
 9V Zener diode, 5W ( and  are both used when in bigger power and frequent On/Off.
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