Rockwell Automation Publication 750-IN001P-EN-P - April 2017 225
Chapter 5
I/O Wiring
Important points to remember about I/O wiring:
• Always use copper wire.
• Wire with an insulation rating of 600V or greater is recommended.
• Separate control and signal wires from power wires by at least 0.3 meters
(1 foot).
• For CE compliance, 115V digital input wiring must be shielded or must
not exceed 30 m (98.4 ft) in length.
• To maintain electrical safety for all user-accessible low voltage circuits
(SELV and PELV circuits) for I/O terminals that are designated for 24V
or lower voltage, follow these guides:
– Do not connect to a circuit of higher voltage.
– Do not connect to a circuit that is not adequately insulated from
dangerous voltages with double or reinforced insulation within other
connected equipment or wiring.
• To provide electrical safety for user-accessible low voltage I/O circuits
that are referenced to earth (PELV circuits) and that can be touched
simultaneously, provide a common earth reference for all equipment
that is connected to the drive.
IMPORTANT I/O terminals that are labeled ‘(–)’ or ‘Common’ are not referenced to earth
ground and are designed to reduce common mode interference. Grounding
these terminals can cause signal noise.
ATTENTION: Hazard of personal injury or equipment damage exists when
using bipolar input sources. Noise and drift in sensitive input circuits can
cause unpredictable changes in motor speed and direction. Use speed
command parameters to help reduce input source sensitivity.
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