Schneider Electric,MULTI-MODE QUANTUM HOT STANDBY CPU 4 MB,1 Modbus Plus with-1 Modbus with-1 USB with-1 optic fibre with Hot Standby protocol,Modicon Quantum automation platform,Modicon Quantum automation platform,Unity processor,expandable 8 MB - file storage with PCMCIA card-expandable 7168 kB - program with PCMCIA card-internal RAM 3072 kB - 1536 kB for data,expandable 8 MB - file storage with PCMCIA card-expandable 7168 kB - program with PCMCIA card-internal RAM 3072 kB - 1536 kB for data