2-channel isolated barrier, 24 V DC supply (Power Rail), Dry contact or NAMUR inputs, Isolated passive transistor output, TTL level, Line fault detection (LFD), Reversible mode of operation, Up to SIL 2 acc. to IEC/EN 61508, Housing width: 20 mm, Number of channels: 2-channel, Safety Integrity Level (SIL): SIL 2, Rated voltage: 19 ... 30 V DC, Field device: NAMUR sensor, Field device [2]: volt-free contact, Line fault detection, Type: 2 x Transistor (passive), Reversible mode of operation