The parameters of Allen - Bradley 1747 - L531 E are as follows:
Memory: Maximum user memory is 8K instructions.
I/O Capacity: Maximum 4096 digital I/O points, maximum 480 local analog I/O.
Scan Time: Program scan time is 1ms/kword, I/O scan time is 0.225ms.
Chassis and Slots: Maximum 3 local I/O chassis, and each local I/O chassis can have up to 30 I/O module slots.
Communication Ports: DH - 485 and RS - 232.
Backup Memory: Flash, standard battery - backed RAM.
Working Temperature: 0 to 60 degrees Celsius.
Backplane Current: 500 milliamps at 5 volts DC.