Rockwell Automation 9323-S5500D A.I. SERIES MICROLOGIX 1000 AND PLC-500 SOFTW - Manual (Page 309)

Customizing PLC-500 A.I.
12-15
6. When you finish typing the text, press [Enter] as many times as necessary to move
the cursor out of the text entry field, or press [Tab] once. The text you defined
appears next to the function key designator.
7. Press [Esc] to save the function key text and exit.