This uninterruptible power supply (UPS) controller 1606-XLS240-UPS is an addition to standard 24V power supplies to bridge power failures or voltage fluctuations. Expensive downtimes, long restart cycles and loss of data can be avoided. The DC-UPS includes a professional battery management system which charges and monitors the battery to achieve the longest battery service life as well as many diagnostic functions that ensure a reliable operation of the entire system. A unique feature of the 1606-XLS240-UPS is that only one 12V battery is required to buffer the 24V output. This makes matching batteries unnecessary and allows a precise battery charging and testing. The 1606-XLS240-UPS requires one external 12V battery for which two preassembled battery modules are available: a lightweight 7Ah battery that can be mounted on the DIN rail and a 26Ah module that can be panel-mounted for longer buffer times. In addition to the 1606-XLS240-UPS, the 1606-XLS240-UPSC UPS includes the same controller with an integrated 5Ah battery.