VIPA CPU 315SB Powered by SPEED7 Work memory [KB]: 1.024...4.096 Interface [RJ45]: Ethernet PG/OP communication Interface [2x RS485]: MPI, PROFIBUS master/slave, PtP: ASCII, STX/ETX, 3964(R), USS master, Modbus master/slave SD/MMC card slot with locking, up to 32 modules stackable, programmable with WinPLC7, SIMATIC Manager and TIA Portal