ABB REB 551-C4 2.5 Series Operator's Manual page 20

Human Machine Interface
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1. Status indication LEDs
2. LCD unit, example of main menu
3. &DQFHO and (QWHU buttons
4. Navigation buttons
5. Optical connector
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The number of buttons used on the HMI module is reduced to a minimum to allow a
communication as simple as possible for the user. The buttons normally have more than
one function, depending on actual dialogue.
Pressing any button in idle mode will activate the HMI display.
The C button has three main functions:
&DQFHO any operation in a dialogue window.
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