Resetting the device to the factory defaults
If you reset, all the changes you have made will be overwritten by factory defaults. Follow the
steps outlined below:
1. Turn on display mode A. Display mode A is active when the "DM" LED is not lit. If this LED
is lit or flashing, you will need to press the SET/SELECT briefly (possibly several times) until
the "DM" LED goes off. If the SELECT/SET button is not pressed for longer than a minute,
the device also turns on display mode A.
2. Hold down the SELECT/SET button for 12 seconds. If you release the button before the 12
seconds have elapsed, the reset is canceled.
Definition of the fault mask
Using the fault mask, you specify an individual "good status" for the connected ports and the
power supply. Deviations from this status are then displayed as errors/faults.
1. Turn on display mode A or D. Display mode A is active when the "DM" LED is not lit. Display
mode D is active when the "DM" LED flashes yellow/orange. If a different display mode is
active, you will need to press the SET/SELECT briefly (possibly several times) until the
required display mode is active.
2. Hold down the SET/SELECT button for five seconds. After three seconds, the "DM" LED
begins to flash. If you release the button before the five seconds have elapsed, the previous
fault mask will be retained.
Enable/disable the redundancy manager
1. Turn on display mode B. Display mode B is active when the "DM" LED is lit green. If a
different display mode is active, you will need to press the SET/SELECT briefly (possibly
several times) until display mode B is active.
2. Hold down the SET/SELECT button for five seconds. After three seconds, the "DM" LED
begins to flash. If you release the button before the five seconds have elapsed, the action
is aborted.
3. The result of the action depends on the initial situation:
– If the redundancy manager and media redundancy were disabled, media redundancy is
also enabled after enabling the redundancy manager.
– If you disable the redundancy manager, media redundancy remains enabled.
Configuration, displays and display elements
7.4 The SET / SELECT button
SCALANCE X-300
146 Operating Instructions, 11/2019, A5E01113043-24
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