Omron ZEN - Page 66

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Wiring Section 2-2
CPU Units with 20 I/O Points and Expansion I/O Units
Connecting Expansion I/O Units with DC Inputs
Precautions for Safe Use
• Supply power to both the CPU Unit and Expansion I/O Units
from the same power supply and turn them ON and OFF at the
same time.
• When connecting Expansion I/O Units with DC inputs to a CPU
Unit with an AC power supply, the burst noise immunity will be 1
kV (IEC 61000-4-4).
Precautions for Correct Use
• Input circuit commons are internally connected to the N terminal
of the power circuit for CPU Units with AC power supplies. Input
circuit commons are internally connected to the N terminal of the
power circuit for Expansion I/O Units with AC power supplies.
Wire the L terminal to the power supply of the input device.
L N NC I0 I1 I2 I3 I4 I5 NC I6 I7 I8 I9 Ia Ib
L N IN0 IN1 IN2 IN3
LN
Circuit
protector
CPU Unit with 20 I/O points
Expansion I/O Unit
ZEN-8E1AR
(AC input type)
100 to 240 VAC, 50/60 Hz
Input device
L N NC I0 I1 I2 I3 I4 I5
COM IN0 IN1 IN2 IN3 COM IN0 IN1 IN2 IN3
L
N
Circuit
protector
CPU Unit with 10 I/O points
Expansion I/O Unit
ZEN-8E1DT
(DC inputs and
transistor outputs)
100 to 240 VAC, 50/60 Hz
Input
device
Input
device
Expansion I/O Unit
ZEN-8E1DR
(DC inputs and
relay outputs)
DC power supply
Z211-E1-03.book Page 42 Friday, November 21, 2008 10:38 AM