GE P642 Technical Manual page 111

P64x
the bottom line, character by character. This text is displayed when a function key is accessed in the function key
menu, or it can be displayed in the PSL.
Subsequent cells allow you to carry out the same procedure as above for the other function keys.
The status of the function keys is stored in non-volatile memory. If the auxiliary supply is interrupted, the status of
all the function keys is restored. The IED only recognises a single function key press at a time and a minimum key
press duration of approximately 200 ms is required before the key press is recognised. This feature avoids
accidental double presses.
P64x-TM-EN-1.3
FUNCTION KEYS
Fn Key 1 Label
Function Key 1
Chapter 5 - Configuration
87