Overview
The Allen-Bradley 1747-L514 is an SLC 5/01 processor unit designed for the modular SLC 500 platform. This entry-level controller provides reliable process control and networking capability for small and medium-scale automation applications. The 1747-L514 installs in slot 0 of any 1746 chassis and delivers proven performance for machine controls, process monitoring, and distributed I/O systems across manufacturing, packaging, and utilities sectors.
Key Features
- 4K user memory: 4,000 instructions for program storage and data handling
- DH-485 networking: Built-in slave communication port for programming and networking with other devices
- Up to 960 I/O points: Supports maximum discrete inputs/outputs across distributed chassis
- Compact single-slot design: Mounts directly to 1746 modular chassis
- Capacitor-backed RAM: Battery-backed memory retention during power interruptions
- Extended I/O capability: Supports up to 3 chassis with maximum 30 I/O module slots
Technical Specifications
- Processor type: SLC 5/01
- User memory: 4,000 instructions (4K words)
- Maximum I/O capacity: 960 discrete points
- Backplane current draw: 0.090 A at 5VDC
- Power consumption: 1.75 W minimum
- Scan time: 8 ms per K instructions
- Bit execution time: 4 µs
- Communication: DH-485 (slave/programming channel)
- Backup memory: Capacitor-backed RAM with 1747-BA lithium battery (30-minute capacitor life, 2-year battery lifespan)
- Operating temperature: 0–60°C (32–140°F) at 5–95% relative humidity (non-condensing)
- Shock rating: 30 G
- Vibration: 2.5 G at 57–2000 Hz
- Mounting: Slot 0 of 1746 chassis
- Certifications: UL, C-UL, CE; NEMA ICS 2-230 industrial noise immunity
Typical Applications
- Simple, small-scale machine control and logic
- Basic process and automation tasks in manufacturing
- Pump and valve sequencing
- Packaging line coordination
- Applications requiring DH-485 networking between controllers
- Upgrading from fixed I/O SLC controllers to modular platforms
Compatibility & Replacements
The 1747-L514 is the core processor module for SLC 500 systems and installs in slot 0 of any standard 1746 modular chassis. It works with optional memory modules (1747-M1, 1747-M2) and the 1747-BA lithium battery assembly for extended backup power. The embedded DH-485 port supports communication adapters such as the 1761-NET-AIC and Advanced Interface Converter (AIC) modules. Direct replacements or upgrades within the SLC 500 line include the 1747-L511 (smaller 1K memory) and higher-capacity processors such as the 1747-L541 and 1747-L542. Programming is performed with RSLogix 500 or compatible development environments.
