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Description
Application Scenarios
A municipal water treatment facility in the Midwest operated a filtration control system built on SLC 500 hardware installed in the late 1990s. When the primary 1747-L514 processor developed intermittent memory corruption events during summer electrical storms, the facility faced a critical decision: undertake a full migration to CompactLogix or source a compatible replacement to extend the existing infrastructure. The maintenance team located a tested 1747-L514 unit and performed the swap during a scheduled low-demand window. Because the processor uses a lithium battery-backed RAM with EEPROM backup capability, the team burned the existing program to an EEPROM module before removal, then transferred it to the replacement processor on the bench. The swap restored deterministic control within hours, and the facility avoided the capital expense of a full control system retrofit. For plants still operating SLC 500 platforms, the 1747-L514 represents a pragmatic path to maintain continuous operation without premature migration.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1747-L514 |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Category | SLC 5/01 Central Processor Unit (CPU) |
| Product Line | SLC 500 Modular Series |
| User Memory | 4K instructions (capacitor-backed RAM) |
| Communication Ports | DH-485 (embedded) |
| Maximum Local I/O | 3 local chassis / 30 module slots |
| Maximum Digital I/O | 960 points |
| Maximum Analog I/O | 480 channels |
| Program Scan Time | 8 ms/K typical (ladder logic) |
| I/O Scan Time | 2.6 ms |
| Bit Execution Time | 4 µs (XIC instruction) |
| Programming Software | RSLogix 500 |
| Programming Instructions | 52 |
| Backup Memory | EEPROM via 1747-M1 (1K) or 1747-M2 (4K) module |
| Backplane Current | 90 mA @ 5V DC |
| Operating Temperature | 0°C to +60°C |
| Weight | 0.45 kg (1.0 lb) |
| Lifecycle Status | Discontinued (January 31, 2017) |
