SIMATIC S7-1200, spare part I/O terminal block tinned Digital Signal Module 8CH/16CH (4 pieces with 7 screws each) SIMATIC S7-1200 Basic Controller - flexible thanks to a wide range of communication options. The SIMATIC S7-1200 family also offers accessories tailored to your needs. This ranges from the battery board for long-term buffering of the real-time clock, to memory cards, push-in terminals and input simulators, to the Ethernet switch with four RJ45 ports.