Allen-Bradley 1747-L553 SLC 500 SLC 5/05 Processor, 64K Memory, Ethernet & RS-232 Communication Ports. User Memory, Max: 64K words total (60K words for data or prog., 4K words for data only); Number of I/O: 4096 in + 4096 out absolute maximum; Local Analog I/O, Max: 480; Program Scan Time/Kword: 0.9 ms (typ); I/O Scan Time: 0.225 ms (typ); No. of Local I/O Chassis, Max: 3; No. of I/O Module Slots in the Local I/O Chassis, Max: 30; Communication Ports : Ethernet & RS-232 (RS-232 port can also be configured for a DH-485 network); Backup Memory: Flash; Battery-backed RAM: Standard.      

Including: Allen-Bradley 1747-M13 SLC 500 Flash Memory Module EEPROM, 64K for SLC 5/03, 5/04, 5/05. EPROM for program and data table storage for the following Series C or later processors: 1747-L531, 1747-L532, 1747-L533, 1747-L541, 1747-L542, 1747-L543, 1747-L551, 1747-L552, 1747-L553. The memory modules consist of a Flash EPROM mounted on a circuit.