Allen-Bradley 1747-L553 SLC 5/05 CPU 64KB Ethernet

Allen-Bradley 1747-L553 Processor Overview

The 1747-L553 processor is the most powerful CPU in the SLC 5/05 category. As a single‑slot module, it installs directly into slot zero of any SLC 500 chassis. This controller integrates an Ethernet port for high‑speed networking and an RS‑232 port for local device connectivity. Furthermore, its large 64KB memory capacity makes it an excellent choice for complex logic, data handling, and system integration tasks.

Core Technical Specifications

The 1747-L553 provides a significant memory upgrade over its predecessors, offering a total user memory of 64K words. This memory is split into 60K words for programs and data, plus 4K words reserved exclusively for user data storage. The battery‑backed RAM ensures your critical programs are safe during power interruptions.

• I/O Capacity: This CPU supports a massive 4096 inputs and 4096 outputs, alongside 480 local analog I/O points. Consequently, it can manage extensive machinery or multiple production lines simultaneously.

• Processing Speed: The module delivers a fast program scan time of 0.9 ms/K and an I/O scan time of 0.225 ms. Specifically, it executes bit instructions in just 0.37 µs, ensuring rapid response to field events.

• Communication Ports: It features a 9‑Pin RS‑232 port for peer‑to‑peer communication with HMIs or programming terminals. Additionally, the built‑in Ethernet port supports 10/100 Mbps transmission and is ideal for networking over long distances (up to 100 meters).

• Chassis Support: You can expand the system with up to 3 local I/O chassis, providing a total of 30 module slots for I/O and specialty modules.

• Instruction Set: The 1747-L553 uses an advanced, PLC‑5‑processor‑based instruction set. This includes support for floating‑point math, online programming, and a built‑in real‑time clock and calendar.

Mechanical and Environmental Parameters

Built for reliability in industrial settings, the 1747-L553 operates effectively within a temperature range of 0 to 60 degrees Celsius. Its storage temperature range is from -40 to 85 degrees Celsius, and it can withstand a non‑condensing relative humidity of 5 to 95%.

• Power Draw: The processor draws a backplane current of 1 Amp at 5 Volts DC and 0 Amps at 24 Volts DC.

• Vibration & Shock Resilience: It can handle 0.015 inches of peak‑to‑peak displacement (5‑57 Hz) and 2.5G acceleration (57‑2000 Hz). Moreover, it is rated for operating shocks of 30G, making it suitable for demanding environments.

• Battery Backup: The unit includes a replaceable 1747‑BA lithium battery that typically lasts two years. Besides that, an internal capacitor provides at least 30 minutes of backup time if the battery is removed.

Installation and Setup Guidance

Installing the 1747-L553 is straightforward. First, always ensure the chassis power is off before inserting or removing any module. This processor must be placed in slot 0 of the SLC 500 chassis.

After mounting, connect the chassis power supply. For network configuration, the Ethernet port supports BOOTP for easy IP assignment. Meanwhile, the RS‑232 port can be configured for direct connection to a programming workstation or an HMI. Remember to connect the battery within 30 minutes if it has been disconnected to prevent data loss from the RAM.

Packaging and Logistics

Your order includes everything needed for a standard installation. All items are carefully packaged to ensure they arrive in perfect condition.

• Packaging List:

  • 1 x 1747-L553 SLC 5/05 Processor Module

  • 1 x Battery (1747-BA)

  • Installation Instructions

Shipping: We use FedEx, UPS, or DHL to provide fast and tracked global delivery.

Frequently Asked Questions (FAQ)

Q1: How much memory does the 1747-L553 processor provide?
The 1747-L553 offers a total of 64K words of user memory. This is the highest capacity available in the SLC 5/05 series, with 60K words dedicated to programs and data and 4K words for user data storage.

Q2: Can this CPU communicate with other Allen-Bradley PLC platforms?
Yes, it can. Using the built‑in Ethernet port and specific messaging protocols, the 1747-L553 can exchange data with other platforms like PLC‑5, CompactLogix, and ControlLogix.

Q3: What communication options are available on the 1747-L553?
This processor includes an integrated Ethernet port for networking and an RS‑232 port for local serial communication. Additionally, you can install optional communication adapters for protocols like Remote I/O, DH+, and DeviceNet.

Q4: What is the maximum I/O count for this processor?
The 1747-L553 supports up to 4096 discrete inputs and 4096 discrete outputs, plus up to 480 local analog I/O points, making it ideal for large‑scale applications.

Q5: How do I protect the program data if the battery needs replacement?
The processor includes a capacitor that provides at least 30 minutes of backup time after battery removal. You must connect a new battery within this 30‑minute window to avoid losing the data in the battery‑backed RAM.