Rockwell Automation Publication 2080-UM002M-EN-E - April 2022 47
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.
Topic Page
Wiring Requirements and Recommendation 47
Use Surge Suppressors 48
Recommended Surge Suppressors 49
Grounding the Controller 50
Wiring Diagrams 51
Controller I/O Wiring 55
Minimize Electrical Noise 55
Analog Channel Wiring Guidelines 55
Minimize Electrical Noise on Analog Channels 56
Grounding Your Analog Cable 56
Wiring Examples 56
Embedded Serial Port Wiring 57
WARNING: Before you install and wire any device, disconnect power to the
controller system.
WAR NING: 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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