Omron ZEN Operation Manual page 68

Wiring
1,2,3...
Wiring Output Circuits
(1) Relay Output Type
Inductive Loads
When connecting an inductive load to an input, connect a diode in
parallel with the load. The diode should satisfy the following require-
ments:
1. Peak reverse-breakdown voltage must be at least 3 times the
load voltage.
2. Average rectified current must be 1 A.
For CPU Units with 10 I/O points, all 4 outputs in the relay output cir-
cuits have independent contacts. For CPU Units with 20 I/O points,
outputs Q0 to Q3 in the relay output circuits have independent con-
tacts and outputs Q4 to Q7 have 2 points per common.
There are no particular restrictions on polarity.
CPU Unit with 10 I/O points
Q0 Q1 Q2
CPU Unit with 20 I/O points
Q0 Q1 Q2
IN
Diode
COM
The V1 CPU Unit is shown at the
left. Wiring is the same for pre-V1
CPU Units.
Q3
Q3 Q4 Q5
Section 2-2
ZEN
Q6 Q7
45