Rockwell Automation 1758-RTU202 DataSite Hardware User Manual - Manual (Page 29)

Publication 1758-UM001D-EN-P - June 2011
Wiring the Controller 29
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 terminal of the controller to the ground bus prior
to connecting any devices. Use AWG #14 wire.
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 .
Power Wiring
Connect the "V+" terminal to the "+" end of 12V DC.
Connect the "V-" terminal to the "-" end of 12V DC.
ATTENTION
All devices connected to the RS232/RS485 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.
WARNING
Do not reverse the polarity of the current.
Refer to Power Source Requirements on page 28 for details on
wiring.
V- V+
12V DC Ground
2 3 1
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