User Memory Words, Max: 48K; Total I/O, Max: 2048 (any mix), 2048 in and 2048 out (complimentary); ControlNet I/O Transmission Rate: 5 Mbit/s; Number of ControlNet Ports: 1 (redundant); Maximum Number of Nodes: 48 (without repeater), 99 (with repeaters); Number of Remote I/O Racks, Max: 15; Number of Remote I/O Devices, Max: 60; Number of Ports Configurable for DH+ or Remote I/O (Adapter or Scanner): 2; Serial Ports: 1; Coprocessor Ports: 1.