Overview
The Allen-Bradley 1747-L541 is an SLC 5/04 processor module within the SLC 500 series by Rockwell Automation. This used unit delivers reliable control for medium-sized industrial automation applications. The processor features 16K words of user memory with battery-backed CMOS RAM, dual communication ports (DH+ and RS-232), and a scan time of 0.225 milliseconds for responsive I/O handling.
Key Features
- Fast Program Execution: 0.9 ms/K typical program scan time for responsive control logic
- Dual Communication Channels: DH+ for high-speed messaging with SLC 500, PLC-2, PLC-5, and ControlLogix processors; RS-232 for DF1, DH-485, ASCII, and Modbus RTU
- High I/O Capacity: Supports up to 4096 input points and 4096 output points, plus 480 analog I/O through compatible modules
- Battery-Backed Memory: CMOS RAM retention during power loss with replaceable battery
- Mode Selection: 3-position keyswitch for Run, Remote, and Program modes with status LEDs (RUN, FLT, BATT, FORCE, DH+, RS-232)
- Advanced Instructions: Supports advanced math, indirect addressing, remote I/O, and DeviceNet pass-through
Technical Specifications
- User Memory: 16,000 words (16K)
- Backup Memory: 64KB flash (1747-M13 compatible)
- Max I/O Points: 4096 inputs + 4096 outputs (expandable via Remote I/O)
- Analog I/O: Up to 480 points
- Program Scan Time: 0.9 ms/K typical
- I/O Scan Time: 0.225 milliseconds
- Backplane Current: 1 Amp @ 5V DC; 200 mA @ 24V DC
- STI (Selectable Timed Interrupt): 1 millisecond minimum
- DII (Discrete Input Interrupt): 0.5 milliseconds minimum
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Communication Protocols: DH+, DF1, DH-485, ASCII, Modbus RTU
- Certifications: UL listed (US/Canada), CE compliant, C-Tick marked
- Mounting: SLC 500 chassis/rack (requires 1-slot)
Typical Applications
The 1747-L541 is well-suited for:
- HVAC control systems and facility management
- SCADA (Supervisory Control and Data Acquisition) systems
- Material handling and conveyor control
- Packaging and bottling line automation
- Distributed I/O control with remote racks
- Machine tool and assembly line controllers
Compatibility & Replacements
Compatible With
- SLC 500 modular chassis (4-slot, 7-slot, 10-slot, 13-slot configurations)
- SLC 500 I/O modules (analog, digital input/output, specialty)
- Remote I/O adapters and scanners for distributed I/O
- 1747-M13 backup memory modules (Series C OS401 or later)
- DH+ and RS-232 connected Allen-Bradley devices (SLC 500, PLC-2, PLC-5, ControlLogix)
- Studio 5000 Logix Designer (via 1747-PGM adapter card)
- RS-Linx and RSNetWorx for system configuration
Replaces / Drop-In Replacement For
- 1747-L541 Series A and earlier (direct processor replacement)
- Earlier SLC 5/03 systems requiring processor upgrade
Works With
- RS-Logix 500 and RSLogix 500 Pro (primary programming platform)
- RSNetWorx for DH+ and DH-485 network configuration
- RS-Linx for gateway and communication services
- Data Highway Plus (DH+) networks for multi-drop control
- DF1 radio modems and serial devices via RS-232
- Modbus RTU master/slave integration
- DeviceNet adapters for expanded I/O networks
