Allen-Bradley MicroLogix 1200 User Manual page 42

3-6 Wiring Your Controller
All devices connected to the RS-232 channel must be referenced to controller ground, or
ATTENTION
be floating (not referenced to a potential other than ground). Failure to follow this
procedure may result in property damage or personal injury.
• For 1762-L24BWA, 1762-L40BWA, 1762-L24BWAR, and 1762-L40BWAR 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 1762-L24BXB, 1762-L40BXB, 1762-L24BXBR, and 1762-L40BXBR controllers:
The VDC NEUT or common terminal of the power supply is also connected to
chassis ground internally.
Publication 1762-UM001D-EN-P - March 2004
This product is intended to be mounted to a well grounded mounting
surface such as a metal panel. Refer to the Industrial Automation
Wiring and Grounding Guidelines, publication 1770-4.1, for
additional information. Additional grounding connections from the
mounting tab or DIN rail, if used, are not required unless the
mounting surface cannot be grounded.
Use all four mounting positions for panel mounting
TIP
installation.
Grounding Stamping
Remove the protective debris strip before applying
ATTENTION
power to the controller. Failure to remove the strip
may cause the controller to overheat.