Rockwell Automation 2080-LC50 Micro830 and Micro850 Programmable Controllers User Manual - Manual (Page 226)

210 Rockwell Automation Publication 2080-UM002F-EN-E - December 2013
Appendix C Quickstarts
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.