Allen-Bradley 1747-L543 SLC 5/04 Processor

1747-L543 PLC Controller – High-Performance SLC 5/04 Processor

Product Introduction

The 1747-L543 from Allen-Bradley stands as the most memory-rich variant within the SLC 5/04 processor family. This controller handles complex automation tasks with ease, thanks to its 64KB user memory and support for up to 4096 inputs and 4096 outputs. Additionally, it provides built-in communication via a 9-pin RS-232 port and a 3-wire terminal for the Data Highway Plus (DH+) protocol. For engineers managing distributed I/O architectures, this processor offers a reliable and centralized control solution. Its battery-backed RAM ensures program retention during power interruptions, while the front-panel status LEDs deliver quick diagnostic feedback.

Key Technical Specifications

This SLC 5/04 processor integrates 64,000 words of user memory, with 60,000 words allocated for combined program and data storage and 4,000 words reserved exclusively for data. The 1747-L543 supports a maximum of 4096 discrete inputs and 4096 discrete outputs, making it well-suited for large-scale automation projects. For analog signal handling, it accommodates up to 480 analog I/O channels. The typical program scan time is 0.9 milliseconds per kilobyte, while the I/O scan time runs at just 0.225 milliseconds. Bit execution occurs in 0.37 microseconds, ensuring rapid response to logic changes. Communication options include a DH+ port using a 3-wire terminal and a standard 9-pin RS-232 port for programming and HMI connectivity. The processor also accepts a 1747-M13 Flash EPROM module for backup memory, and the onboard 1747-BA battery preserves the RAM contents during power loss.

Mechanical and Environmental Parameters

The 1747-L543 operates reliably across a wide temperature range from 0 to 60 degrees Celsius, with storage capability from -40 to 85 degrees Celsius. It withstands non-condensing humidity levels between 5 and 95 percent. For shock resistance, this controller handles 30 G of operating shock and endures vibration of 2.5 G at 57 to 2000 Hertz, plus a displacement of 0.015 inches peak-to-peak at 5 to 57 Hertz. Power consumption includes a backplane current draw of 1 ampere at 5 Volts DC and 125 milliamperes at 24 Volts DC. Furthermore, the program scan hold-up time after power loss ranges from 20 milliseconds up to 3 seconds, depending on the power supply loading conditions.

Application Scenarios

This Allen-Bradley processor excels in medium to large control applications, particularly those requiring distributed I/O topology. For instance, you can place SLC racks close to field devices, significantly reducing long cable runs and minimizing the need for multiple standalone processors. Instead, communication scanners reside in each distributed I/O rack, while a communication adapter installs in the chassis containing the CPU. Consequently, the 1747-L543 centralizes control across widely spread processes without sacrificing performance. Moreover, its programming capabilities cover basic bit logic instructions as well as advanced functions like PID loops, motion control, and position control. The built-in diagnostic buffer provides detailed fault information when connected online, simplifying troubleshooting and reducing downtime.

Installation Guidelines

Installing the 1747-L543 requires a compatible SLC 500 chassis with available slots. First, ensure the power supply is turned off before inserting the processor into the designated CPU slot. Next, secure the module by firmly pressing it into the backplane connector and fastening the retaining screws. For communication setup, connect the DH+ network via the 3-wire terminal or attach a programming terminal to the RS-232 port using a standard serial cable. Remember to install the 1747-BA battery if not already fitted, and consider adding the 1747-M13 Flash EPROM module for extra backup protection. Finally, power on the system and verify the status LEDs—RUN, CPU FAULT, FORCED I/O, RS-232, and DH+—to confirm normal operation.

Packaging List

• Allen-Bradley 1747-L543 SLC 5/04 processor module (1 unit)

• 1747-BA battery (pre-installed)

• User manual quick start guide (printed)

• Installation instructions sheet

• Anti-static protective packaging

Shipping Information

All orders are shipped via FedEx, UPS, or DHL with full tracking and insurance coverage. Expedited shipping options are available upon request.

Frequently Asked Questions

Q1: Is the 1747-L543 compatible with older SLC 500 racks?
Yes, this processor fits into any standard SLC 500 chassis and works with existing 1746-series I/O modules.

Q2: Can I program the 1747-L543 using Rockwell Software?
Absolutely. You can program it using RSLogix 500 software, which supports all SLC 500 family controllers.

Q3: What happens if the battery fails?
The processor will lose its program and data memory if the battery is depleted. We recommend replacing the 1747-BA battery every 1 to 2 years as preventive maintenance.

Q4: Does the 1747-L543 support Ethernet communication?
Not directly. However, you can add a 1747-AENTR or other Ethernet adapter to bridge the DH+ or RS-232 network to an Ethernet backbone.

Q5: Is this processor still available since the SLC series is discontinued?
Yes, we offer new surplus and professionally tested refurbished units with full functionality. Contact us for current stock availability.