Rockwell Automation 9323-S5500D A.I. SERIES MICROLOGIX 1000 AND PLC-500 SOFTW - Manual (Page 460)

Troubleshooting and Diagnostics
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3. The I/O module configuration screen appears. Select the module containing the bit
you want to toggle, and press [F9] Monitor . (If you had the cursor on an input or
output instruction in step 1, this step will be skipped and you will go directly from
step 2 to step 4.)
4. The system displays the I/O status screen for the module.
5. Use the arrow keys to highlight the bit you want to toggle, and press [F1] Bitval to
toggle the value of the bit.
Note You can also use this screen to force bits on or off, remove forces, and enable or
disable forces.
To use the bit toggle function from the Ladder Logic display while in Processor
Emulation Mode or while online:
1. Place the cursor on a contact that uses the bit.
2. Press [Shift-F5] . The value of the instruction under the cursor will toggle from
zero to one or vice versa.
3. (Online Only) You will be prompted to confirm that you wish to toggle the bit.