SIMATIC S7-1200, analog I/O SM 1234, 4 AI/2 AO, +/-10V, 14 bit resolution or 0 (4)-20mA, 13 bit resolution SIMATIC S7-1200 Basic Controller - flexible thanks to a wide range of communication options. With signal modules, you can adapt the configuration of your SIMATIC S7-1200 (except CPU 1211C) to suit your individual requirements. A range of digital and analog input, output and mixed modules is available for this purpose, including fail-safe versions. This fine-grained design option saves you space in the control cabinet and optimizes your hardware costs.