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5-4-5

Electrical Environment

When installing or wiring devices, make sure that there will be no danger to people and that noise will
not interfere with electrical signals.
PLC Installation Location
Install the PLC as far away as possible from high-voltage (600 V or higher) and power devices to ensure
safe operation and maintenance.
OK
NG
Examples of Equipment Arrangement in Panel with High-voltage Devices
Arrangement of PLC and Units
Observe the following points.
• Place a Unit that does not generate much noise next to the CPU Unit, such as an Input Unit or Com-
munications Unit.
• The coils and contacts in electromagnetic contactors and relays in an external circuit are sources of
noise. Locate them at least 100 mm away from the PLC.
CJ2 CPU Unit Hardware User's Manual
Example of Recommended Equipment Arrangement
PLC
Control panel
Control panel
Example of Poor Equipment Arrangement
Control panel
Control panel
DC I/O
AC I/O
device
device
Terminal block
Example of Arrangement in Panel
High-voltage
power panel
PLC
High-voltage
power panel
5 Installation
5
5-45
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