"Description
Allen-Bradley 1747-L531 is an SLC 5/03 Processor from the SLC 500 family, designed for small to large-scale distributed control systems. With 8KB of memory, it supports 4096 I/O points and communication via DH485 and RS-232.

General Info
Part Number: 1747-L531
Series: SLC 500
Module: SLC 5/03 Processor
Memory: 8 KB (Battery Backed-RAM)
Inputs: 4096
Outputs: 4096
Analog I/O: 180
Chassis: 3 chassis, 30 slots
Backplane Current: 500 mA (5V DC)
Battery Backup: Yes (requires 1747-BA)
Dimensions: 145 x 35 x 142 mm
Operating Temperature: 0°C to 60°C
Storage Temperature: -40°C to 85°C
Vibration: 0.015-inch peak-to-peak at 5-57 Hz
Shock: 30 G
Humidity: 5% to 95% (non-condensing)
Specifications
Program Scan Time: 1 ms/K
I/O Scan Time: 0.225 ms
Communication: DH485, RS-232
User Memory: 8,000 words
Power: 1.75 W (minimum)
Hold-up Time: Continues operation temporarily during power fluctuation
Battery: User-replaceable, lasts up to 2 years
Backup Memory: Flash EPROM (1747-M13), up to 64 KB
Features
Configurable Memory: Choose between 8 KB, 16 KB, or 32 KB
Communication Protocols: DH-485, ControlNet, DeviceNet, Modbus RTU, DF1, and ASCII
Hold-up Time: Processor runs temporarily after power loss
LED Indicators: Show battery and processor status
Memory Expansion: Supports Flash EPROM (up to 64 KB)
Key Switch: Select PROGRAM, RUN, or REMOTE mode
Compatibility
I/O Modules: Up to 60 modules, including analog, digital, and intelligent I/O
Memory: Compatible with Flash EPROM for program retention
Slots: 3 chassis, 30 module slots
Environmental
Operating Temperature: 0°C to 60°C
Storage Temperature: -40°C to 85°C
Humidity: 5% to 95% (non-condensing)"