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1 Introduction and Precautions
1.2.4 Wiring Precautions
Select, Separate, and Lay External Wiring Correctly
• I/O lines connecting external devices to the 120-series I/O Modules must be
selected based on the following considerations: mechanical strength, resistance
to noise, wiring distance, signal voltage, and so on.
• I/O lines must be separated from power lines both inside and outside the control
panel to minimize the affects of noise. Faulty operation may result if I/O lines are
not sufficiently separated from power lines.
Example of external wiring separation
Power lines
General control
circuit cables
Steel-plate separator
Digital I/O
signal cables
1-10
Analog I/O
Pulse input
signal cables
signal cables
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