Maintenance mode
The HMI server license may not be available during maintenance if the USB dongle and License Key Terminal are missing or a client license is not present. The HMI server denies access to the HMI client without a license. Maintenance mode was introduced for this purpose, allowing an HMI client to be run for diagnostic purposes in the event of a license error.
A new user group __SystemMaintenanceUsers has been introduced. This is displayed in the HMI Configuration window when the advanced server icons are active (1).
You can use maintenance mode once a user has been configured for the __SystemMaintenanceUsers group. In the Create / edit user dialog, you can select the user group if the advanced server icons are active (see above).
The maintenance mode is then available on the standard login page. You can disable this option in the HMI server settings under TcHmiSrv/Security/Maintenance mode.
When maintenance mode is activated, all connected clients are locked. They are unlocked again when maintenance mode is exited. Maintenance mode is available for two hours, after which it is blocked for 20 minutes. A maintenance login is offered automatically when a license error occurs.
Initially, the time available is displayed as a banner, and it is displayed permanently in the footer area. Additional warnings are displayed as banners shortly before expiry.
