SIMATIC S7-1200, SM1278 IO-Link, 4xIO-Link Master SIMATIC S7-1200 Basic Controller - flexible thanks to a wide range of communication options. To ensure data transfer to a wide variety of systems, a range of communication modules is available for SIMATIC S7-1200, from the RS 232 interface via AS-i to the PROFIBUS connection in master or slave mode. This ensures a wide range of possible applications for SIMATIC S7-1200.