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The CPU 315F-2 DP features the following:
- Microprocessor;
the processor achieves a processing time of approximately 50 ns per binary instruction and 0.45 µs per floating-point operation. - Memory:
384 KB high-speed RAM for safety-relevant and standard program sections; increased memory space requirements must be expected (5 times larger) if safety-relevant program sections are implemented. 128 KB data memory of the 384 KB work memory can be used for standard applications. SIMATIC Micro Memory Cards (max. 8 MB) as load memories for programs additionally permit storage of the project (including symbols and comments) in the CPU. - Flexible expansion capability;
max. 32 modules, (4-tier configuration) - MPI multi-point interface;
the integrated MPI interface can establish as many as 16 connections simultaneously to S7-300/400 or to programming device, PC, OP. Of 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". - PROFIBUS DP interface:
The CPU 315F-2 DP with PROFIBUS DP master/slave interface allows a distributed automation configuration offering high speed and ease of use. From the user's point of view, the distributed I/O is handled in the same manner as central I/O (identical configuration, addressing and programming).
Distributed I/O stations with fail-safe I/O modules can be connected via the integral PROFIBUS DP interface. The fail-safe I/O modules of ET 200M can also be installed in central, safety-related configurations.
The safety-oriented communication between the F-CPU and the fail-safe I/O modules is performed on the basis of the PROFIsafe profile.