The 1747-L532 is a high-performance processor module for the Allen-Bradley SLC 500 controller family. As part of the 5/03 series, this CPU offers a robust balance of processing speed, memory capacity (16K words), and communication flexibility, making it a staple for mid-sized industrial control applications ranging from assembly lines to process monitoring.

⚙️ Product Datasheet & Technical Specifications

• Manufacturer: Allen-Bradley (Rockwell Automation)

• Model: 1747-L532 (SLC 5/03)

• Memory Size: 16K Words

• Communication Ports: 1x RJ45 DH-485 port, 1x RS-232 Channel (DF1/ASCII/Modbus)

• Scan Time: 0.22 ms/K (typical)

• Backplane Current: 100 mA at 5 V DC; 0 mA at 24 V DC

• Dimensions: 145 x 35 x 142 mm

• Weight: 0.50 kg

• Origin: USA

🛠️ Mechanical Installation Requirements

• Mounting: The module must be inserted into a standard 1746 I/O chassis. Align the card rails carefully and ensure it is fully seated to guarantee a reliable backplane connection.

• Spatial Clearance: Ensure at least 150 mm of clearance above and below the chassis to maintain adequate thermal airflow, as the CPU generates internal heat during operation.

• Environment: The controller should be housed in an enclosure that protects against dust, moisture, and extreme temperatures (0°C to 60°C).

⚡ Electrical Wiring Guidelines

• Communication Cables: Use shielded cables for the RS-232 and DH-485 ports. Avoid running these cables alongside high-voltage AC lines to prevent induced signal interference.

• Grounding: The 1746 chassis must be bonded to the main control panel ground using a heavy-gauge copper conductor or braided strap to provide a low-impedance path for EMI/RFI shielding.

• Power Requirements: The processor draws power directly from the 1746 backplane power supply. Ensure the power supply is rated for the total load of all modules in the rack.

🌐 Communication Configuration Steps

• Channel Setup: Use RSLogix 500 software to configure the communication channels. Channel 0 (RS-232) is typically configured for DF1 protocol, while Channel 1 is reserved for the DH-485 network.

• Addressing: Assign a unique station address (Node ID) if connecting to a DH-485 network to prevent data collisions.

• Baud Rate: Match the baud rate settings (e.g., 19.2K) in the software with the physical devices on the network to ensure successful data synchronization.

❓ Frequently Asked Questions (Q&A)

• Q: What does the “FLT” (Fault) LED indicate? A: A solid red FLT light usually indicates a major hardware or software error. You must go online with the processor using RSLogix 500 to view the “Processor Status” and identify the specific fault code.

• Q: How do I back up the program? A: You can use RSLogix 500 to perform an “Upload” from the processor to your PC. Additionally, the processor uses an internal lithium battery to maintain the program in RAM; ensure this battery is replaced periodically.

• Q: Can I communicate with this PLC over Ethernet? A: The 1747-L532 does not have a native Ethernet port. You would need to add a 1761-NET-ENI communication bridge module to enable Ethernet connectivity.