Allen Bradley 1747-L543 SLC 5/04 CPU[AB 1747-L543]

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 : DH+ & RS-232 (RS-232 port can also be configured for a DH-485 network); Backup Memory: Flash; Battery-backed RAM: Standard