< 2 channels
< Inputs Ex ia
< Mounting in Zone 2, Class I/Div.2 or in the safe area
< Dry contact or NAMUR inputs
< Galvanic isolation between channels and the bus
< Positive or negative logic selectable
< Simulation mode for service operations (forcing)
< Line fault detection (LFD)
< Permanently self-monitoring
< Module can be exchanged under voltage