Functionality

Digital inputs	8 (24 VDC), can be used as source inputs or as sink inputs
Digital outputs	8 normally open relay outputs (24 VDC or 100-240 VAC, 2 A max.)
LED displays	For signal states
Internal power supply	Via I/O bus
External power supply	Via the terminal L+ (process voltage 24 VDC). The negative pole is provided by the I/O bus.