The CPU 312C is equipped with the following:

• Microprocessor;
  the processor achieves a processing time of 100 ns per binary instruction.
• Extensive memory;
  64 KB high-speed work memory (equals approx. 21 K instructions) for program components relevant to execution offers sufficient space for user programs;
  SIMATIC Micro Memory Cards (max. 8 MB) as load memory for the program also allow the project to be stored in the CPU (complete with symbols and comments).
• Flexible expansion capability
  max. 8 modules, (1-tier installation)
• MPI multi-point interface
  The integrated MPI interface can establish as many as 6 connections simultaneously to S7-300/400 or to programming device, PC, OP. Among these connections, one is always reserved for programming devices and another for OPs. The MPI makes it possible to set up a simple network with a maximum of 16 CPUs via "global data communication".
• Integrated inputs/outputs
  10 digital inputs (all for alarm processing) and 6 digital outputs are available to connect the process signals to the CPU 312C.