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Offline mode 29
8
8 Settings files and offline system
configuration
All system settings are recorded locally in “Settings” files. These files are updated each time a
setting is modified and automatically updated every 30 minutes.
NOTE: Both CPUs must have the same configuration and settings at all times, otherwise
unpredictable system behavior could occur. Every 30 minutes the system compares the
settings between the CPUs. If a mismatch in settings between CPUs does occur, an event will be
generated. A mismatch should be correctly immediately.
8.1 Offline mode
The HMI has a special offline mode. Offline mode disconnects the HMI from a live system and
allows users to modify and save settings. Later, once reconnected to a live system, these saved
settings can be written to the system.
The following operations are permitted in offline mode:
• User Settings activities
• Maintenance activities
• User Administration
Another convenience offline mode provides is the ability to work on protection settings prior to
the arrival of the switchgear. See Commissioning the switchgear
on page 11 for more details.