1747-L542 | Allen-Bradley SLC 5/04 Processor 32K DH+ & RS-232

The 1747-L542 is a SLC 500 processor (PLC) from Allen-Bradley. It is part of the SLC 5/04 family and has 64K of user memory. The module provides high-speed processing, with a 4K I/O capacity and built-in communication ports (DF1 and DH+), allowing it to interface with remote I/O modules, HMIs, and other systems. It is used for a wide range of industrial automation applications.

Key features of the 1747-L542 processor include:

• 64K User Memory for program and data storage.
• I/O Capacity: Supports up to 4K I/O modules, expandable with additional racks.
• Communication Ports: Built-in DF1 (serial) and DH+ (Data Highway Plus) communication ports for network communication.
• Processing Speed: Suitable for medium-scale applications requiring fast processing times.
• Battery-Backed RAM to retain memory during power outages.
• Compact Size: Fits in SLC 500 chassis for easier integration and flexibility in system design.

To program the 1747-L542, you need RSLogix 500 software. This software is used to configure and program the SLC 500 series processors. It provides features for

• I/O configuration.
• Ladder logic programming.
• Diagnostics and troubleshooting.
• Communication setup (DF1, DH+, etc.).

RSLogix 500 can be used to develop and download the control program to the 1747-L542 processor.

To configure communication on the 1747-L542:

1. DH+ Configuration: In RSLogix 500, configure the DH+ node address for the processor. The DH+ address is needed for communication with other devices over the DH+ network.
2. DF1 Configuration: Set up the DF1 communication settings to communicate with external devices, such as HMIs, other processors, or programming devices.
3. Network Configuration: Use the communication configuration tool in RSLogix 500 to set baud rates, node addresses, and other parameters for communication.
4. Network Setup: Ensure that the network cables are correctly connected to the appropriate ports (DF1 and DH+) for communication with the controller and remote devices.

For specific communication setup, refer to the manual.

To reset the 1747-L542 processor to factory defaults:

1. Power off the processor.
2. Press and hold the Reset button on the processor’s front panel.
3. Power on the processor while continuing to hold the Reset button.
4. After a few seconds, release the button. The processor will return to its factory settings.

Note: This will erase the current program, so ensure that you have a backup if needed before performing the reset.