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16 Industrial Non-display Computers
Connect DC Power
The 650R computer, catalog number 6177R-M3XPDC, is available with a DC power option
using a three-screw terminal block (+24VDC, 24RTN, GND).
The DC power option supports operation from either a safety extra-low voltage (SELV) or
protective extra-low voltage (PELV) power source. A ground bus strip is provided to let you
connect the DC common and functional ground terminals together. This is to support SELV
cases where the end user requires grounding at the computer.
The power supply is internally protected against reverse polarity.
ATTENTION: Use a Class 2/SELV isolated and ungrounded power supply as input power to the
computer. This power source provides protection so that under normal and single fault conditions,
the voltage between the conductors and Functional Earth/Protective Earth does not exceed a safe
value.
1. Secure the DC power wires to the terminal block screws.
2. Secure the ground wire to the GND terminal block screw.
3. Apply 24V DC power to the computer.
Functional Ground Screw
The pre-installed functional ground screw is not required for safety or regulatory compliance.
However, if a supplemental ground is desired, use the functional ground screw on the rear panel
of the 750R and 1450R computers, or side panel of the 650R computer.
Rockwell Automation Publication 6177R-IN001G-EN-P - July 2013
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