Allen-Bradley 1747-L541 SLC 5/04 CPU

Overview

The Allen-Bradley 1747-L541 is a Series C SLC 5/04 processor module from the SLC 500 family, engineered for mid-range industrial automation and control. It offers 16,000 words of user memory, 4096 inputs and 4096 outputs along with 480 analog I/O points. It installs into slot 0 of any SLC 500 modular chassis and integrates seamlessly into Allen-Bradley automation environments for both new installations and system maintenance.

Key Features

Program scan time of 0.9 milliseconds and I/O scan time of 0.225 milliseconds
DH+ port and RS-232 port for local communications; RS-232 port can be configured for DH-485 network
Keyswitch on the front panel to select different program modes
Backup flash memory for 64,000 words
Supports messaging with compatible Allen-Bradley SLC 500, PLC 2, PLC 5, and Controllogix processors
Advanced math features such as trigonometry functions, PID, floating point, and compute instruction

Technical Specifications

User Memory: 16,000 words (16K)
Discrete I/O Capacity: 4096 inputs + 4096 outputs, 480 analog I/O
Program Scan Time: 0.9 milliseconds per 1K words
I/O Scan Time: 0.225 milliseconds
Backplane Current: 1 Amp at 5 Volts DC
Additional Backplane Load: 200 mA at 24 Volts DC
Communication Ports: DH+ and RS-232
Flash Backup Memory: 64,000 words
Selectable Timed Interrupt (STI): 1 millisecond
Discrete Input Interrupt (DII): 0.5 milliseconds
Operation Modes: Run, Remote, or Program (3-position key switch)

Typical Applications

The SLC 500 series of processors has a simple, cost-effective design with a history of good installations in applications such as HVAC control, SCADA, and material handling. The 1747-L541 is suited for discrete and analog manufacturing processes requiring mid-range I/O capacity.

Compatibility & Replacements

Compatible With

SLC 500 modular chassis (rack installation)
SLC 500 I/O modules and expansion modules
1747-SN Remote I/O Scanner module for Universal Remote I/O configuration
1747-SDN DeviceNet Scanner module for DeviceNet network configuration
DH+ protocol for extended messaging; RS-232 channel supports DF1 radio modem, DH-485, ASCII and Modbus RTU communications
Allen-Bradley RSLogix 500 programming software

Replaces / Drop-In Replacement For

Related models include the 1747-L542 (32K) and 1747-L543 (64K) for applications requiring greater memory capacity. The 1747-L541 offers 16K memory; upgrade to L542 or L543 if larger memory is required. Rockwell Automation discontinued the 1747-L541 as of December 31, 2021; it is classified as an engineering replacement candidate. Verify legacy system compatibility with your system integrator before ordering.