The first cell down in the FUNCTION KE
YS column is the Fn Key Status cell. This contains a binary string, which
represents the function key commands. Their status can be read from this binary string.
FUNCTION KEYS
Fn Key Status
0000000000
The next cell down (Fn Key 1
) allows you to activate or disable the first function key (1). The Lock setting allows a
function key to be locked. This allows function keys that are set to Toggled mode and their DDB signal active
‘high’, to be locked in their active state, preventing any further key presses from deactivating the associated
function. Locking a function key that is set to the Normal mode causes the associated DDB signals to be
permanently off. This safety feature prevents any inadvertent function key presses from activating or deactivating
critical functions.
FUNCTION KEYS
Fn Key 1
Unlocked
The next cell down (Fn Key 1 Mode
) allows you to set the function key to Normal or Toggled. In the Toggle mode
the function key DDB signal output stays in the set state until a reset command is given, by activating the function
key on the next key press. In the Normal mode, the function key DDB signal stays energised for as long as the
function key is pressed then resets automatically. If required, a minimum pulse width can be programmed by
adding a minimum pulse timer to the function key DDB output signal.
FUNCTION KEYS
Fn Key 1 Mode
Toggled
The next cell down (Fn Key 1 Label
) allows you to change the label assigned to the function. The default label is
Function key 1 in this case. To change the label you need to press the enter key and then change the text on
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.
FUNCTION KEYS
Fn Key 1 Label
Function Key 1
Subsequent cells allow you to carry out the same procedure as above for the other function keys.
The status of the function k
eys 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.
Chapter 5 - Configuration P14x
80 P14xEd1-TM-EN-1
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