Allen-Bradley 2080-LC20-20QWB User Manual page 157

Quickstarts Appendix C
Remember you cannot force a Physical Input and cannot force a Logical Output.
In many cases, the front of the controller is not visible to the operator and
Connected Components Workbench is not online with the controller. If you
want the force status to be visible to the operator, then the User Program must
read the force status using the SYS_INFO function block and then display the
force status on something that the operator can see, such as the human machine
interface (HMI), or stack light. The following is an example program in
Structured Text.
If the front of the controller is visible, and not blocked by the cabinet enclosure,
Micro830 and Micro850 controllers have a Force LED indicator.
I/O Forces After a Power Cycle
After a controller is power cycled, all I/O forces are cleared from memory.
Rockwell Automation Publication 2080-UM005B-EN-E - March 2015 149