Allen Bradley SLC 500 Series PLC CPU 1747-L531
The Allen-Bradley 1747-L531 is an SLC 5/03 Processor for the SLC 500 PLC platform. While now considered a legacy product by Rockwell Automation, thousands remain in active service due to their extreme reliability and the massive installed base of SLC 500 hardware.
Technical Specification:
| Feature | Specification |
| Processor Type | SLC 5/03 |
| User Memory | 8 KB (Instruction/Data words) |
| I/O Capacity | Max. 4096 Discrete / 480 Analog |
| Local I/O Chassis | Up to 3 chassis (30 slots total) |
| Typical Scan Time | 0.6 ms per 1K of program |
| Programming Software | RSLogix 500 |
| Battery | 1747-BA (Lithium) for memory backup |





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