Rockwell Automation 1772-LS_LSP,D17726.8.6 PROG/OPER MANUAL-MINI PLC-2/05 - Manual (Page 227)

Program Troubleshooting
Chapter 19
19-6
Using a Force Function
You can apply forcing functions in either of two ways using:
bit manipulation/monitor display of an I/O word
ladder diagram display of user program
By pressing [SEARCH] 53 <address>, the bit status and force status of the
16 corresponding input bits or output terminals of the desired word is
displayed. use the [<-] and [->] keys to cursor to the desired bit. Or, in the
ladder diagram display, you can apply forcing by placing the cursor on an
examine or energize instruction. In either case, after you position the
cursor, you can use any one of the following key sequences for placing or
removing a forced condition:
[FORCE ON][INSERT]
[FORCE OFF][INSERT]
[FORCE ON][REMOVE]
[FORCE OFF][REMOVE]
You can remove all force on or all force off functions at once in ladder
diagram display by pressing either of the following key sequences:
[FORCE ON][CLEAR MEMORY]
[FORCE OFF][CLEAR MEMORY]
The on/off status of a forced bit appears beneath the bit instruction in
the rung.
In all operating modes, the terminal displays a “FORCED I/O” message
near the bottom of the screen when the processor forces the bits on or off.
In every mode except the program mode, the terminal displays forced
status “ON” or “OFF” below each forced instruction.
Important: The terminal displays the on/off status of Latch/Unlatch
instructions below the instruction. However, the terminal displays status
only in program mode.
All force functions are cleared when:
you disconnect the industrial terminal from the processor
the processor or industrial terminal loses ac power
you press [MODE SELECT]
ATTENTION: When an energized output is being forced off,
keep personnel away from the machine area. Accidental
removal of force functions may instantly change the state of the
output device. Injury to personnel near the machine could result.