SIMATIC S7-1200, extension cable 2-line design for SM 12XX, 2.0m 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.