Overview
The Allen-Bradley 1747-L541 is an SLC 5/04 central processor unit from the SLC 500 series, designed for medium-to-large industrial automation applications. This processor module features 16K words of battery-backed RAM and supports flexible I/O control for manufacturing, material handling, HVAC, SCADA, and process control systems.
Key Features
- 16K words user memory with battery backup and 64KB flash memory support
- Up to 4,096 discrete inputs and 4,096 discrete outputs with 480 analog I/O capacity
- Dual communication channels: DH+ for high-speed extended messaging and RS-232 for DF1, DH-485, ASCII, and Modbus RTU
- Built-in real-time clock/calendar with 1 ms Selectable Time Interrupt (STI) and 0.5 ms Discrete Input Interrupt (DII)
- Advanced math functions including trigonometry, PID, floating-point, and compute instructions
- 3-position keyswitch for Run, Remote, and Program mode selection
Technical Specifications
- Program Scan Time: 0.9 milliseconds per keyword
- I/O Scan Time: 0.225 milliseconds
- Bit Execution (XIC): 0.37 microseconds
- Backplane Current Load: 1 A at 5V DC; 200 mA at 24V DC
- Thermal Dissipation: 4 Watts minimum
- Chassis Slots: 30 module slots
- Operating Temperature: 0 to 60°C (32 to 140°F)
- Power Hold-up Time: 20 ms to 3 seconds (brief power loss protection)
- Certifications: UL listed (US and Canadian standards), CE compliant, C-Tick marked
Typical Applications
The 1747-L541 is widely deployed in cost-effective, proven automation solutions across multiple industries:
- HVAC control systems and facility management
- Assembly line and manufacturing automation
- SCADA and process control applications
- Material handling and conveyor systems
- Discrete and batch process control
Compatibility & Replacements
Compatible With
- SLC 500 series chassis and racks
- Remote I/O networks and DeviceNet pass-through
- Allen-Bradley SLC 500, PLC 2, PLC 5, and ControlLogix messaging
- 1747-M13 flash-based memory module (supports 64K user-memory backup)
- RSLogix 500 programming software
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The 1747-L541 Series C supersedes earlier revisions and is comparable to SLC 5/04 models with identical I/O capacity and memory specifications.
Works With
- RSLogix 500 development environment
- Data Highway Plus (DH+) industrial network
- DF1, DH-485, ASCII, and Modbus RTU protocols
- Indirect addressing and remote I/O control
