Rockwell Automation 2080-L50E-24QBB - Chapter 4 Wire Your Controller; Wiring Requirements and Recommendations

Rockwell Automation Publication 2080-UM002N-EN-E - November 2022 43
Chapter 4
Wire Your Controller
This chapter provides information on the Micro830, Micro850, and Micro870 controller wiring
requirements. It includes the following sections:
Wiring Requirements and
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 may use blue for DC wiring and
red for AC wiring.
Topic Page
Wiring Requirements and Recommendation 43
Use Surge Suppressors 44
Recommended Surge Suppressors 45
Grounding the Controller 46
Wiring Diagrams 46
Controller I/O Wiring 50
Minimize Electrical Noise 50
Analog Channel Wiring Guidelines 50
Minimize Electrical Noise on Analog Channels 50
Grounding Your Analog Cable 51
Wiring Examples 51
Embedded Serial Port Wiring 52
WARNING: Before you install and wire any device, disconnect power to the
controller system.
WARNING: 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.