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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.
ATTENTION
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.
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 1763-L16BWA controllers:
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 controllers:
The VDC NEUT or common terminal of the power supply
is also connected to chassis ground internally.
MicroLogix™ 1100 Programmable Controllers
Publication 1763-IN001A-MU-P - May 2005
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