Omron ZEN Operation Manual page 71

Wiring
Precautions for Safe Use
Precautions for Correct 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.
• Expansion I/O Units with AC inputs (ZEN-8E1AR) cannot be
connected to a CPU Unit with a DC power supply.
• The input common for Expansion I/O Units with relay outputs
(ZEN-8E1DR) is internally connected to one side of the power
supply circuit (COM terminal).
• A power supply does not need to be connected to Expansion I/O
Units with transistor outputs (ZEN-8E1DT).
Section 2-2
47