Omron ZEN Operation Manual page 74

Wiring
■
1,2,3...
50
Inductive Loads
When connecting an inductive load to an input, connect a diode in
parallel with the load. The diode should satisfy the following
requirements:
1. Peak reverse-breakdown voltage must be at least 3 times the load
voltage.
2. Average rectified current must be 1 A.
IN
Diode
COM
Section 2-2
ZEN