Siemens 6EP1931-2FC01 Profibus Interface Module

Siemens 6EP1931-2FC01 SITOP DC UPS Module is a 24 V DC uninterruptible power supply designed to keep critical automation loads powered during mains interruptions. It delivers a 24 V DC output rated up to 40 A from a 24 V DC input, with an integrated battery to bridge outages and maintain control circuits. Status is indicated by three LEDs: green OK for normal operation, yellow Bat signaling battery/hold-up mode, and red Alarm for faults. The unit provides floating changeover contacts for remote monitoring or interlocks—useful for signaling “24 V DC OK/Bat” and “Alarm” to other equipment. This variant is specified without a serial interface, distinguishing it from versions that include USB or RS-232 connectivity. Typical applications include safeguarding PLCs, drives, sensors and other 24 V DC devices in SITOP-powered systems such as SIMATIC ET200 Distributed I/O environments, where continuous 24 V power is essential and a compact UPS solution is needed. Input terminals are designated L+ and M, while the output remains 24 V DC to the load, supporting up to 40 A of current.