Allen-Bradley 1747-L552 SLC 5/05 Processor Module

Product Overview

The Allen-Bradley 1747-L552 is a controller module from the SLC 500 series, specifically the SLC 5/05 processor sub-category. This single-slot processor connects directly to the backplane of any SLC 500 chassis. It features built-in Ethernet communication for networked applications and an RS-232 port for peer-to-peer communication, enabling out-of-the-box vertical integration for Industrial Internet of Things (IIoT) requirements. Unlike other SLC 500 processors that rely on proprietary protocols like DH485 or Data Highway Plus, the embedded Ethernet simplifies connectivity to enterprise-level systems.

Technical Specifications Breakdown

Key parameters for the 1747-L552 are listed below for quick reference:

Industry Applications

With a capacity of 4096 discrete I/O and 480 analog I/O, it can control multiple small processes or a single large process. The embedded Ethernet port supports up to 48 connections, making it suitable for applications requiring simultaneous data exchange between machine-level controllers and enterprise systems. For example, in a manufacturing plant, this processor can integrate production line PLCs with a central SCADA system. The RS-232 port allows direct connection to an HMI located in the same panel, simplifying local operator interface.

Installation & Setup Guidance

When installing the 1747-L552, ensure power is turned off before adding or removing the module. The processor mounts directly into any SLC 500 chassis slot. Use the BOOTP-enabled Ethernet port for network configuration. The processor supports up to three chassis with a maximum of 30 slots total. For remote I/O topology, plan strategic placement of I/O modules to optimize performance. The RS-232 port is best for short-distance communication (same panel) due to limited cable length.

Maintenance & Reliability

The 1747-L552 includes an user-replaceable lithium battery (1747-BA) that lasts an average of two years. A capacitor provides at least 30 minutes of backup after battery disconnection, allowing safe data retention. Inspect the battery periodically and replace it as needed to avoid losing RAM data. The operating temperature range is 0 to 60 degrees Celsius, with storage from -40 to 85 degrees Celsius. Non-condensing relative humidity of 5 to 95% is acceptable. The processor withstands 30G operating shock and vibration up to 2.5G at 57-2000 Hz.

Compatibility & Integration

This processor supports Ethernet and RS-232 communication natively. The Ethernet port enables integration with enterprise networks and supports up to 48 connections. For legacy systems, note that other SLC 500 processors may require specialty modules for DH485 or Data Highway Plus, but the 1747-L552 simplifies vertical integration with its embedded Ethernet. Backup memory uses the 1747-M13 module.

Selection Guide & Purchasing Advice

When selecting the 1747-L552, consider your I/O count and communication needs. With 4096 inputs and outputs, it suits medium to large applications. The 32 KB memory (32,000 words) provides ample space for complex programs. For replacement or upgrade projects, verify chassis slot availability and power supply loading. AutoDCSTech offers this processor with fast shipping and expert support. Please verify current lifecycle status and availability with AutoDCSTech before ordering.

Troubleshooting & Common Issues

Status LEDs on the processor allow monitoring of its current state. If the processor fails to communicate via Ethernet, check the BOOTP configuration and network cabling. For RS-232 issues, verify cable length and pinout. If the battery is low, replace it within 30 minutes to prevent data loss. The program scan hold-up time ranges from 20 milliseconds to 3 seconds after power loss, depending on power supply loading. For persistent issues, consult the SLC 500 user manual.