Rockwell Automation 1753-PCS-PAR Using RSLogix Guard PLUS! with GuardPLC Controllers - Manual (Page 77)

Publication 1753-PM001A-EN-P - November 2005
Monitor and Force Signals 5-7
3. The Force Editor opens.
Once forcing starts, the Forcing activated box is checked and R-Force
values take precedence over R-Values.
Stop Forces To stop forcing, click the Stop… tab or choose File>Stop.
Once forcing is stopped, the Forcing activated check box is cleared.
However, the Resource Force Mark (RF) field is still checked,
indicating that force values remain in the resource, but are inactive.