The simatic s7 1200 system includes three different cpu performance classes cpu 1211c 1212c cpu and cpu 1214c all can be enlarged in accordance with the mechanical requirements for each cpu board a signal can be added to expand digital or analog i o without increasing the physical control signal modules can be mounted on the right side of the cpu to extend the digital or analog i o capacitysimple and convenient installationthe complete simatic s7 1200 hardware has built in clip for qui