User manual

Rockwell Automation Publication 1756-UM001O-EN-P - October 2014 63
Start Using the Controller Chapter 3
The mode switch on the front of the controller can be used to change the
controller to one of these modes:
• Run (RUN)
• Remote (REM)
• Program (PROG)
IMPORTANT
During runtime, we recommend that you place the controller mode switch in
RUN mode and remove the key (if applicable) from the switch. This can help
discourage unauthorized access to the controller or potential tampering with
the program of the controller, configuration, or device firmware. Place the
mode switch in REM or PROG mode during controller commissioning and
maintenance and whenever temporary access is necessary to change the
program, configuration, or firmware of the product.
Mode Switch
Position
Available Controller Modes
ATTENTION:
RUN Run mode—The controller is actively controlling
the process/machine. Projects cannot be edited in
the Logix Designer application when in Run mode.
Run mode is used only when all conditions are
safe.
1756-L7x 1756-L6x
Mode Switch