Rockwell Automation Publication 1766-UM001O-EN-P - September 2021 33
Chapter 3
Wire Your Controller
Wiring Requirements Wiring Recommendation
• Allow for at least 50 mm. (2 in.) between I/O wiring ducts or terminal
strips and the controller.
• Route incoming power to the controller by a path separate from the
device wiring. Where paths must cross, their intersection should be
perpendicular.
• Separate wiring by signal type. Bundle wiring with similar electrical
characteristics together.
• Separate input wiring from output wiring.
• Label wiring to all devices in the system. Use tape, shrink-tubing, or
other dependable means for labeling purposes. In addition to labeling,
use colored insulation to identify wiring based on signal characteristics.
For example, you can use blue for DC wiring and red for AC wiring.
Topic Page
Wiring Requirements 33
Use Surge Suppressors 34
Ground the Controller 36
Wiring Diagrams 37
Sinking and Sourcing Wiring Diagrams 40
Controller I/O Wiring 42
Wire Your Analog Channels 43
Expansion I/O Wiring 45
ATTENTION: Before you install and wire any device, disconnect power to the
controller system.
ATTENTION: Calculate the maximum possible current in each power and
common wire. Observe all electrical codes dictating the maximum current
allowable for each wire size. Current above the maximum ratings may cause
wiring to overheat, which can cause damage.
United States Only: If the controller is installed within a potentially hazardous
environment, all wiring must comply with the requirements stated in the National
Electrical Code 501-10 (b).
Do not run signal or communications wiring and power wiring in the same conduit.
Wires with different signal characteristics should be routed by separate paths.
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