The Siemens SIMATIC S7-300 has CPU central processing unit with 1.5 MB work memory with differnt interface such as 1st interface MPI/DP 12 Mbit/s, 2nd interface DP master/slave micro memory card required, it can be used with software package S7 distributed safety V5.2 SP1 or higher.
Power loss: 4.5 W Number of expansion units, max. 3