Allen-Bradley 1747-L542 SLC 5/04 Processor Module

Product Overview

The Allen-Bradley 1747-L542 functions as a high-performance CPU within the SLC 500 product line. This SLC 5/04 controller manages complex automation tasks by providing 32 KB of configurable memory. Furthermore, the processor facilitates high-speed communication through an integrated Data Highway Plus (DH+) port and an RS-232 serial port. Consequently, engineers deploy this module in applications requiring robust peer-to-peer messaging and seamless integration with existing Allen-Bradley control architectures.

Technical Specifications

• Model Number: 1747-L542
• Manufacturer: Allen-Bradley (Rockwell Automation)
• Controller Series: SLC 5/04
• User Memory: 32 KB
• I/O Capacity: Up to 4096 discrete I/O points
• Communication Ports: Data Highway Plus (DH+), RS-232 (DF1)
• Program Scan Time: 0.9 ms per 1K words
• Backplane Current: 1.0 A at 5V DC
• Operating Temperature: 0°C to 60°C (32°F to 140°F)
• Weight: 0.9 kg
• Status: Discontinued (June 30, 2016)

Functional Capabilities and System Design

The 1747-L542 architecture optimizes system responsiveness for mid-range control requirements. Because the processor supports advanced instruction sets, it executes complex logic and data manipulation tasks with high efficiency. Moreover, the controller utilizes a combination of battery-backed RAM and optional Flash EPROM to maintain program integrity. This redundancy ensures that the system retains configuration data during unexpected power cycles or prolonged facility shutdowns.

Maintenance personnel monitor system health through dedicated diagnostic LEDs located on the front module face. These indicators provide immediate feedback regarding processor faults, battery status, and active communication link activity. Furthermore, the 1747-L542 mounts directly into the slot zero position of an SLC 500 chassis, which streamlines installation within existing control panels. By leveraging the DH+ interface, the module communicates reliably with other processors and HMI terminals across a wide geographic range. Consequently, the 1747-L542 remains a primary choice for facility managers maintaining legacy SLC 500 platforms where high availability and proven performance are mandatory.