Overview
The Allen-Bradley 1747-L511 is an entry-level processor module in the SLC 500 modular platform. As an SLC 5/01 CPU, it provides a PLC-5 processor-based instruction set suitable for small process control, material handling, HVAC control, and distributed SCADA applications. The 1747-L511 is a cost-effective solution for systems that do not require advanced networking or Remote I/O topology.
Key Features
- 1K words of user memory (500 words program, 500 words data storage)
- Built-in DH485 serial communication port for simple network integration
- Support for up to 960 local digital I/O per module with maximum 3940 discrete I/O addressing
- Up to 480 analog I/O points with compatible modules
- Expandable to 3 local SLC 500 chassis (maximum 30 I/O module slots)
- LED status indicators: Run, CPU Fault, Forced I/O, and Battery Low
- Capacitor-backed memory for program retention
- UL listed to US and Canadian safety standards; CE compliant; C-Tick marked
Technical Specifications
- Processor Type: SLC 5/01
- User Memory: 1K words (1000 instructions)
- Maximum Local Digital I/O: 960 points
- Maximum Addressable I/O: 3940 discrete I/O
- Maximum Analog I/O: 480 points
- Program Scan Time: 8 ms/K words typical
- I/O Scan Time: 2.6 ms typical
- Backplane Current (5V DC): 350 mA
- Backplane Current (24V DC): 105 mA
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Communication Port: DH485 (send/receive only, non-initiating)
- Memory Backup: Capacitor-backed retention
- Certifications: UL listed, CE compliant, C-Tick marked
- Maximum Chassis: 3 local SLC 500 chassis, 30 I/O module slots
- Weight: 250 g
Typical Applications
- Small-scale process control and discrete manufacturing
- Material handling systems and conveyor control
- HVAC system automation and climate control
- Packaging and filling equipment
- Distributed SCADA installations
- Entry-level industrial automation projects with modest I/O requirements
Compatibility & Replacements
Compatible With
- SLC 500 modular I/O chassis (up to 3 local chassis)
- Over 60 SLC 500 digital, analog, and intelligent I/O modules
- DH485 communication networks and Allen-Bradley devices supporting DH485
- RSLogix 500 programming software
- SLC 500 expansion modules and adapter networks
Replaces / Drop-In Replacement For
The 1747-L511 is the standard SLC 5/01 entry-level processor. Verify compatibility with your system integrator before substituting or upgrading. No higher-model direct replacements with identical pinout; check memory and I/O requirements when migrating to SLC 5/02, 5/03, 5/04, or 5/05 processors.
Works With
- RSLogix 500 programming environment
- Allen-Bradley ControlLogix systems (via communication bridges)
- DH485 network protocols
- Allen-Bradley HMI and operator interface panels
- EEPROM memory modules for program backup (optional)
