BL20 electronic module, Power module for redundant supply, Fieldbus and connection technology independent, Protection class IP20, LEDs indicating system status, field supply and diagnostic information, Can be used to form potential groups, Two modules can be connected in series for redundant power supply of a BL20 system, BL20 I/O modules and gateway powered with 5 VDC via the internal module bus, Supplies field with 24 VDC nominal voltage