6ES7317-2EK13-0AB0 CPU317-2PN/DP,512K内存SIMATIC S7-300, CPU 317-2DP,CENTRAL PROCESSING UNIT WITH512 KBYTE WORKING MEMORY,1. INTERFACE MPI/DP 12MBIT/S,2. INTERFACE DP-MASTER/SLAVE,MICRO MEMORY CARD NECESSARY