Rockwell Automation Publication 1756-UM001M-EN-P - February 2012 63
Start Using the Controller Chapter 3
Choose the Controller
Operation Mode
Use this table as a reference when determining your controller Operation mode.
Use the Mode Switch to Change the Operation Mode
Use the mode switch to change the operation mode. The controller mode switch
provides a mechanical means to enhance controller and control system security.
You must physically move the controller’s mode switch to change its operating
mode from RUN, to REM, or to PROG. When the controller’s mode switch is
set to RUN mode, features like online editing, program downloads, and firmware
upgrades will be prohibited. See Tab le 6
for a complete list of prohibited features.
The physical mode switch can complement other authorization and
authentication methods that similarly control user-access to the controller, such
as the following:
• Logix CPU Security tool
• FactoryTalk Security service
Table 6 - Controller Operation Modes and Meanings
If you want to
Select one of these modes
Run Remote Program
Run Test Program
Turn outputs to the state commanded by the
logic of the project
XX
Turn outputs to their configured state for
Program mode
XX X
Execute (scan) tasks XXX
Change the mode of the controller through
software
XXX
Download a project XXX X
Schedule a ControlNet network XX
While online, edit the project XXX X
Send messages XXX
Send and receive data in response to a message
from another controller
XXXX X
Produce and consume tags XXXX X
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 controller’s program, 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
product’s program, configuration, or firmware.
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