Product Overview

The Allen-Bradley 1747-DU501 SLC 5/05 Firmware Upgrade Kit is a firmware upgrade package designed for the SLC 5/05 programmable logic controller (PLC) family. Manufactured by Rockwell Automation, this kit provides the software and supporting materials required to update the operating system firmware of compatible SLC 5/05 processors.

Unlike a conventional PLC module, the 1747-DU501 is not installed in a controller chassis as an input, output, communication, or power component. It is a firmware upgrade product used during controller maintenance and lifecycle management. Its purpose is to provide access to supported firmware enhancements for existing SLC 5/05 processors.

The SLC 5/05 processor is part of the Allen-Bradley SLC 500 control platform. It is used in industrial automation systems that require programmable logic control, machine sequencing, process monitoring, and communication with other automation devices. Firmware is an important part of the controller because it determines how the processor executes its operating system functions and supports available instructions and diagnostic capabilities.

The 1747-DU501 is associated with the SLC 5/05 operating system upgrade, identified as OS501. The upgrade is performed through the ControlFLASH process rather than by replacing a plug-in firmware chip. This makes it different from the upgrade methods used for certain SLC 5/03 and SLC 5/04 processors.

The kit is intended for qualified maintenance personnel and automation engineers who need to manage firmware revisions on compatible SLC 5/05 controllers. Before using it, the processor catalog number, hardware series, existing firmware revision, software requirements, and upgrade eligibility must be checked.

Technical Specifications

Note: The dimensions and weight are the supplied listing values. They should be treated as package or catalog listing information rather than the dimensions of an electronic PLC module.

Function and Working Principle

The 1747-DU501 provides the firmware upgrade resources used to update the operating system of a compatible SLC 5/05 processor. The update is carried out through a software-based flashing procedure.

1. SLC 5/05 Operating System Upgrade

The SLC 5/05 processor uses flash memory to store its operating system firmware. The 1747-DU501 provides the upgrade package associated with the OS501 firmware.

Updating the operating system can make supported functional enhancements available to the controller. The actual benefits depend on the firmware revision, processor hardware series, and application requirements.

2. ControlFLASH-Based Upgrade

The SLC 5/05 firmware upgrade is performed using ControlFLASH. The software communicates with the processor through a supported communication path and transfers the firmware image to the controller’s flash memory.

The upgrade procedure must follow the applicable Rockwell Automation installation instructions. The programming computer, communication connection, software version, and processor configuration should all be checked before starting.

3. Firmware Revision Management

Firmware revision management is important in industrial automation because different controller revisions may support different functions or have different operating characteristics.

The 1747-DU501 is intended to help maintenance teams bring eligible SLC 5/05 processors to a supported OS501 revision. Engineers should document the original and updated firmware revisions so that future troubleshooting and replacement work can be carried out accurately.

4. Functional Enhancement Support

Firmware upgrades can provide access to operating system improvements and additional supported controller functions. These enhancements may be relevant when maintaining older applications or addressing compatibility requirements.

However, an upgrade should not be performed simply because a newer revision is available. The required firmware must be compatible with the installed processor and the existing control application.

5. Upgrade Identification

The kit includes five firmware upgrade labels. These labels can be used to identify controllers that have undergone the applicable firmware upgrade process.

Accurate labeling helps maintenance personnel distinguish upgraded controllers from units that still operate with earlier firmware revisions.

Role in Industrial Control Systems

The 1747-DU501 supports maintenance of the SLC 500 control platform by providing a method for updating the operating system of compatible SLC 5/05 processors.

PLC Controller Maintenance

The SLC 5/05 processor executes the control program that manages industrial equipment. Its firmware provides the operating environment required for the controller’s functions.

When a firmware revision needs to be updated, the 1747-DU501 provides the corresponding upgrade resources. This can be relevant in facilities that continue to operate established SLC 500 systems.

Programming Software Compatibility

Firmware upgrades must be considered alongside the programming software used to maintain the PLC. The engineering computer should have the appropriate software and communication drivers installed before the update begins.

Maintenance teams should verify the software requirements specified in the firmware installation instructions rather than assume that every version of RSLogix 500 or ControlFLASH will support every processor revision.

Communication and Upgrade Access

The SLC 5/05 provides communication interfaces that can be used for programming and maintenance. The firmware update procedure uses a supported connection between the engineering computer and the processor.

The communication path must remain stable throughout the flashing operation. Unnecessary cable disconnection, power interruption, or software interference should be avoided.

Long-Term System Support

Many industrial facilities continue to operate SLC 500 equipment because the controllers are integrated into established machines and production processes. Firmware maintenance can form part of a broader strategy for keeping these systems documented and serviceable.

The 1747-DU501 is therefore relevant to legacy controller maintenance, although firmware upgrades alone do not replace the need for spare-parts planning, program backups, and system modernization assessments.

Industrial Applications

The 1747-DU501 is used in maintenance activities involving compatible SLC 5/05 controllers. It is not a direct operating component of a machine, but it supports the controller firmware used by the machine.

1. Manufacturing Automation

Manufacturing facilities may use SLC 5/05 processors to control production sequences, machine interlocks, material movement, and auxiliary equipment.

The firmware upgrade kit can be used when an eligible processor requires an operating system update as part of a planned maintenance activity.

2. Packaging Machinery

Packaging machines often depend on PLC logic for product feeding, counting, sequencing, and equipment coordination. SLC 5/05 controllers may remain in service in established packaging installations.

The 1747-DU501 can support firmware maintenance when the installed processor is compatible with the upgrade.

3. Material Handling Systems

Conveyors, transfer equipment, sorting systems, and other material-handling installations may use SLC 500 controllers for sequence control.

Firmware revision management can help maintenance teams maintain a consistent controller configuration across related machines.

4. Process Control Equipment

Legacy SLC 5/05 controllers may be used for auxiliary process-control functions, including pump sequencing, equipment interlocking, and monitoring of discrete field signals.

The upgrade kit may be used when the processor requires a supported firmware revision for the intended maintenance or application requirements.

5. Industrial Equipment Refurbishment

During machine refurbishment, engineers may inspect the installed PLC hardware, review the existing firmware revision, and determine whether an operating system upgrade is appropriate.

The 1747-DU501 can be considered as part of that process when the processor model and upgrade conditions match the kit’s supported application.

Installation and System Integration

The 1747-DU501 is a software-based firmware upgrade kit. It is not mounted on a DIN rail or inserted into an SLC 500 chassis.

The following considerations are important when preparing for an upgrade.

1. Verify the Processor Model

Confirm that the installed controller is a compatible SLC 5/05 processor. The applicable processor models include:

• 1747-L551
• 1747-L552
• 1747-L553

Do not assume that the kit is suitable for SLC 5/03, SLC 5/04, or other PLC families. Those processors may use different firmware upgrade products and procedures.

2. Check Hardware Series and Firmware Revision

Record the processor catalog number, hardware series, and existing firmware revision before starting.

Firmware eligibility can depend on the controller’s hardware series and current operating system revision. Refer to the applicable release information and installation instructions to confirm that the proposed upgrade is supported.

3. Back Up the Controller Program

Before performing a firmware update, upload and save the existing PLC program using the appropriate programming software.

Document the controller configuration, communication settings, and relevant application parameters. Confirm that a usable backup is available before proceeding.

Firmware updates may affect controller contents and operating state. Never assume that the user program will automatically remain intact throughout the process.

4. Prepare the Engineering Computer

Install and verify the software required for the upgrade. Confirm that the ControlFLASH utility and the appropriate communication drivers are available.

Check the computer’s operating environment and software compatibility against the installation documentation. Avoid starting an upgrade when the engineering computer is unstable or when required software components are missing.

5. Establish a Reliable Communication Connection

Connect the engineering computer to the SLC 5/05 processor through a supported communication interface.

Verify that the controller can be identified correctly before beginning the firmware transfer. A stable connection is essential because communication interruption during firmware flashing can create serious recovery problems.

6. Follow the Official Flashing Procedure

Use the instructions associated with publication 1747-IN019G-EN-P. Follow the prescribed preparation steps, firmware selection, ControlFLASH procedure, and post-upgrade checks.

Do not interrupt the process or remove power unless the procedure specifically instructs you to do so.

7. Verify the Upgrade

After the upgrade, confirm that the processor starts correctly and reports the intended firmware revision.

Check controller status, communication, program operation, and relevant application functions. Restore the saved control program and verify the machine’s operating sequence before returning the equipment to production.

Compatible System Components

The 1747-DU501 is used with the SLC 5/05 controller platform and its associated engineering tools.

These items describe the surrounding maintenance environment. They are not all included in the 1747-DU501 package.

Alternative Models and Replacement Considerations

The 1747-DU501 is a specific firmware upgrade kit for SLC 5/05 processors. Other SLC 500 firmware products are designed for different processor families and should not be treated as direct substitutes.

Before selecting an alternative, verify:

• The processor family and exact catalog number.
• The processor hardware series.
• The installed firmware revision.
• The required target operating system.
• The applicable upgrade instructions.
• The engineering software and ControlFLASH requirements.
• The availability of a verified program backup.
• The communication method used during the update.

A firmware kit intended for one SLC processor family should not be substituted for another merely because both products belong to the SLC 500 range.

Key Advantages

Supports SLC 5/05 Firmware Maintenance

The kit provides the upgrade resources required for supported operating system updates on compatible SLC 5/05 processors.

Software-Based Upgrade Method

The SLC 5/05 firmware update is performed through ControlFLASH, avoiding the physical operating-system chip replacement method associated with certain other SLC processor families.

Supports Functional Enhancements

Updating to an eligible firmware revision can provide access to supported operating system improvements and controller functions.

Helps Standardize Controller Revisions

The included upgrade labels support identification of controllers that have undergone the applicable firmware update.

Useful for Legacy Automation Systems

The kit is relevant to facilities maintaining existing SLC 5/05 installations and planning firmware-related service activities.

Supports Planned Maintenance

When used with proper backups, documentation, and commissioning checks, firmware upgrades can form part of a structured PLC maintenance program.

Technical FAQs

1. What is the Allen-Bradley 1747-DU501?

The 1747-DU501 is a firmware upgrade kit designed for compatible Allen-Bradley SLC 5/05 processors. It provides the resources for updating the controller’s operating system firmware.

2. Is the 1747-DU501 a PLC module?

No. It is not a CPU, I/O, power supply, or communication module. It is a firmware upgrade package used with a compatible SLC 5/05 processor.

3. Which processors are compatible with the 1747-DU501?

The kit is associated with the SLC 5/05 processor models 1747-L551, 1747-L552, and 1747-L553. Hardware series and firmware eligibility must also be verified.

4. What firmware does the kit upgrade?

It is associated with the SLC 5/05 OS501 firmware platform. The exact revision supplied should be checked against the kit documentation and release information.

5. How is the firmware installed?

The SLC 5/05 firmware is updated through the ControlFLASH utility. The engineering computer communicates with the processor over a supported connection to transfer the firmware image.

6. Does the kit include installation instructions?

Yes. The listed package contents include installation instructions, along with the firmware upgrade media and five upgrade labels.

7. Can the 1747-DU501 be used with an SLC 5/04 processor?

No. The 1747-DU501 is intended for the SLC 5/05 family. The SLC 5/04 uses its own firmware upgrade product, identified as 1747-OS401.

8. Should the PLC program be backed up before upgrading?

Yes. A verified program backup should be created before starting the firmware update. Maintenance personnel should also record controller settings and communication information.

9. Is the 1747-DU501 still in production?

The product is listed as discontinued by distributors. Availability may depend on remaining inventory and specialist industrial automation suppliers.

10. What should buyers check before purchasing?

Verify the complete catalog number, package contents, firmware revision, media condition, and availability of the required documentation. For legacy software products, also confirm that the supplied media and upgrade resources are suitable for the intended processor and engineering environment.

Procurement and Maintenance Recommendations

When sourcing the Allen-Bradley 1747-DU501, verify that the package is the correct SLC 5/05 firmware upgrade kit rather than a different SLC 500 firmware product.

Because the item is a software and documentation package, its condition should be evaluated differently from that of a conventional PLC module. Buyers should check the supplied media, instructions, labels, packaging, and any license or usage requirements associated with the upgrade.

For maintenance teams, the processor’s original firmware revision and hardware series should be recorded before purchasing the kit. This helps prevent the use of an incompatible firmware package and reduces unnecessary downtime.

Before performing an upgrade, create a complete PLC program backup and confirm that the required programming software, ControlFLASH utility, and communication connection are available. Follow the official installation instructions and verify the controller’s operation after the firmware update.

For critical production systems, schedule the work during an approved maintenance window. Keep the original configuration records and a tested recovery plan available in case the controller does not return to normal operation.

Conclusion

The Allen-Bradley 1747-DU501 SLC 5/05 Firmware Upgrade Kit is a specialized maintenance product for updating the operating system firmware of compatible SLC 5/05 PLC processors. Associated with the OS501 firmware platform, it uses the ControlFLASH upgrade method and supports firmware maintenance for the 1747-L551, 1747-L552, and 1747-L553 processor models, subject to hardware and revision eligibility.

For industrial facilities maintaining legacy SLC 500 automation systems, correct firmware identification, verified backups, compatible software, and careful execution of the upgrade procedure are essential. The 1747-DU501 remains a relevant catalog reference when maintaining supported SLC 5/05 controller installations.