1. Introduction
This manual provides essential information for the installation, operation, maintenance, and troubleshooting of the Allen-Bradley 1747-L542/B REV3 SLC500 Processor. The SLC500 series is a family of small, chassis-based, modular programmable controllers, designed for industrial control applications. This specific processor unit includes the 1747-OS401/B operating system and key, enabling robust and reliable control.
Figure 1: Front view of the Allen-Bradley 1747-L542/B SLC500 Processor, showing indicator lights and key switch.
2. Setup and Installation
2.1 Mounting the Processor
The 1747-L542/B processor is designed to be installed into a compatible SLC500 chassis. Ensure the chassis is securely mounted in a suitable industrial enclosure, providing adequate ventilation and protection from environmental factors.
Figure 2: Top view of the processor, illustrating its compact design for chassis integration.
2.2 Wiring and Connections
Connect the processor to the power supply and communication modules within the SLC500 chassis. Ensure all connections are firm and correctly seated. Refer to the chassis documentation for specific wiring diagrams.
Figure 3: Side view revealing the internal circuit board and components, highlighting the modular design for maintenance and expansion.
2.3 Initial Configuration
Upon initial power-up, the processor will load the 1747-OS401/B operating system. Use the provided key to set the processor mode (RUN, REM, PROG) as required for your application. For programming, set the key to PROG and connect via the RS232 port.
3. Operating the Processor
3.1 Indicator Lights
The front panel features several indicator lights:
- RUN: Illuminates when the processor is in Run mode and executing the user program.
- FLT (Fault): Illuminates when a major fault occurs. Refer to the troubleshooting section for details.
- BATT (Battery): Illuminates when the battery voltage is low, indicating a need for replacement.
- FORCE: Illuminates when an I/O point is being forced.
- DH+: Indicates activity on the Data Highway Plus communication port.
- RS232: Indicates activity on the RS232 communication port.
3.2 Key Switch Positions
The key switch on the front panel controls the processor's operating mode:
- RUN: The processor executes the user program. No program changes can be made.
- REM (Remote): The processor mode can be changed via programming software (e.g., RSLogix 500).
- PROG (Program): The processor is in Program mode, allowing program upload, download, and modifications. The processor does not execute the user program in this mode.
4. Maintenance
4.1 Battery Replacement
When the BATT indicator illuminates, the processor's battery needs replacement to retain memory during power loss. Power down the chassis, carefully remove the processor, and replace the battery according to the instructions in the full SLC500 hardware manual. Use only approved replacement batteries.
4.2 Cleaning
Periodically inspect the processor and chassis for dust and debris. Use a soft, dry cloth or compressed air to clean the unit. Ensure power is disconnected before cleaning.
5. Troubleshooting
5.1 FLT Indicator
If the FLT indicator is illuminated, a major fault has occurred. Common causes include:
- Programming errors.
- Hardware failures in I/O modules.
- Communication errors.
To diagnose, connect to the processor with programming software (e.g., RSLogix 500) and check the fault status. Clear the fault after resolving the issue.
5.2 Processor Not Responding
If the processor is unresponsive, check the following:
- Ensure the chassis has power.
- Verify the key switch position is appropriate for the desired operation.
- Check communication cables and settings.
6. Specifications
Key technical specifications for the Allen-Bradley 1747-L542/B SLC500 Processor:
| Feature | Detail |
|---|---|
| Model Number | 1747-L542/B |
| Series | SER B |
| Revision | REV 3 |
| Type | CPU Processor |
| Operating System | 1747-OS401/B |
| SKU | D516005 |
| Product Dimensions | 8 x 8 x 1.5 inches |
| Weight | 10.4 ounces |
| Processor Count | 1 |
| Processor Core Count | 1 |
| Secondary Cache | 0.51 MB |
Figure 4: Close-up view of the product label, showing model number, series, revision, and operating system details. The serial number is 211P0EQ6SD.
Figure 5: Barcode label indicating the Allen-Bradley 1747-L542 Series B Processor Module. The part number is 0679466.
7. Warranty Information
This Allen-Bradley product is covered by the standard manufacturer's warranty. For specific terms and conditions, please refer to the official Allen-Bradley warranty statement or contact your authorized distributor. Warranty coverage typically addresses defects in materials and workmanship under normal use.
8. Technical Support
For technical assistance, detailed documentation, or advanced troubleshooting, please contact Allen-Bradley customer support or your local authorized Rockwell Automation distributor. Online resources, including knowledge bases and forums, are also available on the Rockwell Automation website.
- Rockwell Automation Website: www.rockwellautomation.com
- Local Distributor: Refer to the Rockwell Automation website for a distributor locator.
