Overview
The Allen-Bradley 1747-L541 /C is a Series C SLC 5/04 processor that forms the core control element of the SLC 500 modular controller family. This mid-range processor delivers dependable performance for industrial automation systems requiring robust I/O handling and fast program execution. The 1747-L541 /C combines proven architecture with dual communication channels to integrate seamlessly into existing SLC 500 systems.
Key Features
- SLC 5/04 Architecture: Enhanced processor with faster communication and execution compared to earlier SLC 5/03 models
- Dual Communication: Built-in DH+ (Data Highway Plus) channel for high-speed network communication plus 9-pin RS-232 serial interface
- 4096 I/O Point Capacity: Supports up to 4096 discrete input and output points through modular I/O modules
- 16K User Memory: 16,000 words of program and data table storage with 64 KB flash backup memory
- Fast Scan Times: 0.9 ms/K program scan time and 0.225 ms I/O scan time for responsive control
- Front Panel Mode Switch: 3-position key switch for Run, Remote, and Program operation modes with LED status indicators (RUN, FLT, BATT, FORCE, DH+, RS-232)
Technical Specifications
- Program Memory: 16,000 words user memory
- Flash Backup: 64 KB
- Maximum I/O: 4,096 input points / 4,096 output points
- Analog I/O: 480 point capacity
- Program Scan Time: 0.9 ms/K typical
- I/O Scan Time: 0.225 ms typical
- Communication Ports: DH+ (built-in) + RS-232 (9-pin)
- Backplane Current: 1 A @ 5V DC, 200 mA @ 24V DC
- Selectable Timed Interrupt: 1 millisecond minimum
- Discrete Input Interrupt: 0.5 milliseconds
- UL Listed: US and Canadian Safety Standards
- Compliance: CE marked, C-Tick marked
Typical Applications
The 1747-L541 /C excels in mid-range automation environments including HVAC control systems, SCADA (Supervisory Control and Data Acquisition) platforms, material handling systems, packaging machinery, and industrial process control. Its combination of I/O capacity and communication flexibility makes it suitable for applications requiring integration across multiple control zones while maintaining cost-effectiveness in hardware investment.
Compatibility & Replacements
The 1747-L541 /C mounts directly into SLC 500 modular chassis (Chassis #1, #2, #3, and #4 sizes) in the leftmost processor slot. The processor requires an SLC 500 power supply (1746-P1, P2, P3, or P4) to operate. Companion processor models include the 1747-L542 (32K memory) and 1747-L543 (64K memory) offering expanded program capacity for complex applications. DH+ communication can be extended to legacy networks using optional bridge interfaces. The processor is compatible with RSLogix 500 programming software for ladder logic development and supports the full library of SLC 500 I/O modules and communication options.
