| Manufacturer | Industrial Automation |
| Brand | Allen-Bradley |
| Part Number/Catalog No. | 1747-L551, L552, or L553 |
| Series | SLC 500 |
| Processor | SLC 505 Processor |
| Inputs | 4096 |
| Outputs | 4096 |
| Analog I/O | 480 |
| User Memory | 16,000, 32,000 or 64,000 Words |
| Program Scan Time | 0.9 milliseconds |
| I/O Scan Time | 0.225 milliseconds |
| I/O Chassis | 3 |
| Chassis Module Slots | 30 |
| Communication | Ethernet, RS-232 |
| Backup Memory | Flash |
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