The signal modules have the same design features as the basic devices:
Installation on DIN rails: The modules are snapped onto the rail next to the CPU on the right and are electrically and mechanically connected to each other and to the CPU by the integral slide mechanism
Direct installation: Horizontal or vertical mounting on DIN rail or direct mounting in the cabinet using integral drill holes
All digital modules are easy to replace thanks to removable connecting terminals ("independent wiring")
Signal boards
The signal boards are plugged directly into the receptacle on the front of each S7-1200 CPU.
Mounting: Signal boards are plugged directly into the SIMATIC S7-1200 CPU and are thus electrically and mechanically connected to the CPU
The CPU mounting dimensions remain unchanged
All signal boards are easy to replace thanks to removable connecting terminals ("independent wiring")
Note
Signal modules cannot be used with the CPU 1211C. Signal boards can be used with all CPUs of the SIMATIC S7-1200.
