Overview
The Allen-Bradley 1747-L541 Series C is a modular SLC 5/04 processor designed for mid-sized industrial automation and control systems. As part of the SLC 500 family, this processor delivers high-performance, cost-effective control for applications requiring flexible I/O management and reliable communications. The Series C revision includes proven reliability with a straightforward design suitable for HVAC control, SCADA systems, material handling, and manufacturing automation.
Key Features
- 16K User Memory: 12K for program/data, 4K for data-only applications with battery-backed CMOS RAM
- High I/O Capacity: Supports up to 4096 digital inputs, 4096 digital outputs, and 480 analog I/O points across multiple chassis
- Dual Communication Ports: Built-in DH+ channel for extended messaging with SLC 500/PLC-2/PLC-5/ControlLogix, plus RS-232 for DF1, DH-485, ASCII, and Modbus RTU
- Fast Processing: Program scan time of 0.9 ms per K-word and I/O scan time of 0.225 ms
- Front Panel Controls: 3-position key switch (RUN, REM, PROG modes) and LED status indicators (RUN, FLT, BATT, FORCE, DH+, RS-232)
- Memory Backup: Compatible with 1747-M13 flash memory module and 1747-BA lithium battery for power-loss protection
Technical Specifications
- Memory: 16,000 words user memory; 64KB backup flash with 1747-M13
- I/O Capacity: 4096 digital inputs, 4096 digital outputs, 480 analog I/O
- Backplane Power: 1 Amp at 5V DC; 200 mA at 24V DC
- Program Scan Time: 0.9 milliseconds per K-word
- I/O Scan Time: 0.225 milliseconds
- Interrupts: 1 ms Selectable Timed Interrupt (STI); 0.5 ms Discrete Input Interrupt (DII)
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Communication Ports: DH+ (Channel 1), RS-232 (Channel 0)
- Supported Protocols: Data Highway Plus, DF1, DH-485, ASCII, Modbus RTU
- Mounting: Slot 0 of 1746 modular chassis; supports up to 3 chassis (30 local I/O slots)
- Maximum Remote I/O Racks: 30
Typical Applications
- HVAC control and facility automation systems
- SCADA and distributed process monitoring
- Material handling and conveyor control
- Food processing and packaging automation
- Water treatment and chemical plant automation
- Assembly line and manufacturing control
- Remote I/O networking with DeviceNet pass-through
Compatibility & Replacements
Compatible With
- SLC 500 modular chassis (1746 series) – slots 1 through 7
- Remote I/O networks via DH+ and RS-232 communication
- Allen-Bradley PLC-2, PLC-5, SLC 500, and ControlLogix processors for messaging
- 1747-M13 Series C OS401 flash memory modules (up to 64KB backup)
- 1747-BA lithium batteries for CMOS RAM backup
- Standard SLC 500 I/O modules (digital input, digital output, analog)
- ASCII devices (serial printers, weigh scales, bar code readers)
- Modbus RTU slave devices
Replaces / Drop-In Replacement For
- Earlier revisions of 1747-L541 (Series A/B) with existing SLC 500 systems
- Direct slot-in replacement for 1747-L541 controllers in SLC 500 racks
Works With
- RSLogix 500 programming software (ladder logic, structured text, instruction list)
- Allen-Bradley ProSoft Network Modules for EtherNet/IP conversion (via third-party modules)
- DH+ industrial network for multi-drop topology communication
- Data Highway Plus extended messaging with distance and multi-drop support
- DF1 point-to-point and multi-drop communication
- ASCII and Modbus RTU master/slave communication protocols
