LB1101A. Occupied slots. 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