AS-Interface is an industrial networking solution for automation systems. It is designed for connecting simple field I/O devices such as binary ON/OFF, analog and safety I/O devices according to EN 50295, IEC 62023-2. Using only a two conductor profile or round cable (ASi cable, 2 x 1.5 mm2, 16 AWG) to connect all ASi modules to the master using a free topology. This is the main advantage of this system compared to conventional, parallel wiring, where every single signal has to be wired directly to the control system. Data and power are available in the same ASi cable. Every ASi node or module has its own address for accessing its data. The modules can be addressed from 1 to 31 (single address), or, with extended addressing, there are 62 nodes available (1A to 31A and 1B to 31B). Single adresses and modules with extended addressing (AB modules) can share the same network.