Electrical installation having an uninterruptible power supply

An electrically operated installation, comprising:

• a plurality of electrical loads which are connected to a basic supply voltage;
• and
• an uninterruptible power supply unit configured, in an event of a failure of the basic supply voltage, to actuate a backup voltage to the plurality of electrical loads to safeguard the supply to the electrical loads for a duration of a backup phase;
• wherein the power supply unit is configured to exchange data with the plurality of electrical loads via a field bus;
• wherein the plurality of electrical loads each have a software module which is configured to communicate via the field bus;
• wherein a software module of at least one electrical load of the plurality of electrical loads is configured as a master and software modules of other loads of the plurality of electrical loads are configured as slaves in a context of master-slave communication;
• wherein the power supply unit is configured as a communication partner of the master for performance of a regulated shutdown procedure of the plurality of electrical loads;
• wherein the power supply unit is configured, in an event of a failure of the basic supply voltage, to notify said failure to the master via the field bus;
• wherein the master and the software modules of the plurality of electrical loads are configured to perform the shutdown procedure in configurable synchronization stages;
• wherein for each synchronization stage the software module, for each load of the plurality of electrical loads stores whether the load of the plurality of electrical loads should maintain or change its energy state and, if several energy state changes are possible and provided for, to which energy state the load should change;
• wherein the master is configured to signal each synchronization stage consecutively to the plurality of electrical loads;
• wherein the plurality of electrical loads are configured to execute the energy state changes stored in the software modules for the respective synchronization stage;
• and
• wherein the software modules are configured, after execution of the energy state changes for the respective synchronization stage, to report to the master.