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1.  SIMATIC S7-300, CPU 312 Central processing unit with MPI, Integr. power supply 24 V DC, Work memory 32 KB, Micro Memory Card required.
2. Area of application
   CPU 312, the smallest S7-300 CPU. This is ideally suited to simple applications in which the advantages of TIA such as
   integrated communication, data management and diagnostics can however be utilized. Networking is possible using MPI
   or by means of CPs, the standard mode of application is, however, non-networked operation. The I/O is normally
   connected in a centralized configuration.
3. The CPU 312 has:
   • Microprocessor; the processor reaches a processing time of 200 – 400 ns per binary instruction
   • Extended memory; 16 KB fast RAM (corresponds to about 5 K instructions) for execution-relevant program parts provide user programs with sufficient space; Micro memory cards (4 MB max.) as load memory for the program allow additional projects to be stored (including symbols and comments) in the CPU.
   • Flexible expansion; up to 8 modules, (single line structure)
   • Interface with multipoint capability (MPI);
   The integrated MPI interface can establish up to 6 simultaneous connections to S7-300/-400 or to PG, PC, OP. Among
   these connections, one is always reserved for PG and another for OP. The MPI can be used to establish a simple
   network with up to 16 CPUs using the “Global data communication”.
   • Password protection; a password concept protects the user program from unauthorized access.
   • Diagnostics buffer; the last 100 error and interrupt events are stored in a buffer for diagnostics purposes.
   • Maintenance-free data back-up; the CPU automatically writes retentive data to the micro memory card in case of power failure, so that it remains available unchanged when the power is turned on again.
   • Integrated communications functions;
   – Programming device/OP communication
   – S7 standard communication
   – S7 communication (server only)

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