Rockwell Automation 1763-L16xxx MicroLogix 1100 Programmable Controllers Installation Instructions - Manual (Page 19)

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Publication 1763-IN001B-EN-P - September 2007
Grounding the Controller
In solid-state control systems, grounding and wire routing helps limit the effects of
noise due to electromagnetic interference (EMI). Run the ground connection from
the ground screw of the controller to the ground bus prior to connecting any
devices. Use AWG #14 wire. For ac-powered controllers, this connection must be
made for safety purposes.
You must also provide an acceptable grounding path for each device in your
application. For more information on proper grounding guidelines, refer to the
Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1.
ATTENTION
All devices connected to the RS-232/485 communication port must be referenced to
controller ground, or be floating (not referenced to a potential other than ground).
Failure to follow this procedure may result in property damage or personal injury.
• For the 1763-L16BWA controller:
The COM of the sensor supply is also connected to chassis ground internally.
The 24V dc sensor power source should not be used to power output circuits. It
should only be used to power input devices.
• For 1763-L16BBB and 1763-L16DWD controllers:
The VDC NEUT or common terminal of the power supply is also connected to
chassis ground internally.