The CPU 317-2 DP is equipped with the following:

• Microprocessor;
  the processor can handle execution times of approx. 25 ns per binary instruction and 160 ns per floating-point instruction. The CPU 317-2 DP is very powerful regarding processing speed, particularly where word or double-word commands and 32 bit fixed-point commands are concerned.
• 1 MB work memory (corresponds to approx. 340 K instructions);
  the extensive work memory for program components relevant to execution offers sufficient space for user programs. SIMATIC Micro Memory Cards (8 MB max.) as load memory for the program also allow the project to be stored in the CPU (complete with symbols and comments) and can be used for data archiving and recipe management.
• Flexible expansion capability;
  max. 32 modules (4-tier configuration)
• Combined MPI/DP interface;
  the first MPI/DP integrated interface can establish as many as 32 connections simultaneously to S7-300/400 or connections to programming device, PC, OP. Among these connections, one is always reserved for programming devices and another for OPs. A simple network with up to 32 CPUs can be configured with the MPI and "global data communication".
  This interface can be reconfigured from an MPI to a DP interface. The DP interface can be used as a DP master or as a DP slave.
• PROFIBUS DP interface:
  The second integrated interface of the CPU 317-2 DP is a pure PROFIBUS DP interface that can be used as a DP master or as a DP slave. It allows a distributed automation configuration with high speeds and simple handling. From the user's point of view, the distributed I/O is treated as central I/O (same configuring, addressing, and programming). PROFIBUS DP slaves can be operated in isochronous mode on this interface.
  The PROFIBUS DP V1 standard is fully supported. This increases the scope of DP V1 standard slaves in terms of diagnostics and parameterization capability.
  Limitation: It is impossible to operate both interfaces simultaneously as slaves.