IEC01000242_2_en.vsd
Activating
signal 2
LED 2
Manual
reset
Activating
signal 1
Automatic
reset
LED 1
Disturbance
tRestart
IEC01000242 V2 EN
Figure 25: Operating sequence 6 (LatchedReset-S), manual reset
5.5.3 Function keys
5.5.3.1 Functionality
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
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.
1MRK 502 048-UEN A Section 5
Local Human-Machine-Interface LHMI
77
Technical manual
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