5.5.3 Function keys
5.5.3.1 Functionality
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Local Human-Machine-Interface (LHMI) has five function buttons, directly to the
left of the LCD, that can be configured either as menu shortcut or control buttons.
Each button has an indication LED that can be configured in the application
configuration.
When used as a menu shortcut, a function button provides a fast way to navigate
between default nodes in the menu tree. When used as a control, the button can
control a binary signal.
5.5.3.2 Operation principle
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Each output on the FNKEYMD1 - FNKEYMD5 function blocks can be controlled
from the LHMI function keys. By pressing a function button on the LHMI, the
output status of the actual function block will change. These binary outputs can in
turn be used to control other function blocks, for example, switch control blocks,
binary I/O outputs etc.
FNKEYMD1 - FNKEYMD5 function block also has a number of settings and
parameters that control the behavior of the function block. These settings and
parameters are normally set using the PST.
Operating sequence
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The operation mode is set individually for each output, either OFF, TOGGLE or
PULSED.
Setting OFF
This mode always sets the outputs to a low value (0).
Input value
Output value
IEC09000330-2-en.vsd
IEC09000330 V2 EN-US
Figure 27: Sequence diagram for setting OFF
Setting TOGGLE
In this mode the output toggles each time the function key has been pressed for
more than 500ms. Note that the input attribute is reset each time the function block
executes. The function block execution is marked with a dotted line below.
1MRK 506 382-UEN A Section 5
Local Human-Machine-Interface LHMI
Line distance protection REL650 2.2 IEC 85
Technical manual
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