The Allen-Bradley 1747-L543, also cataloged as the 1747-L543 SLC 5/04 Processor, operates as a dedicated CPU module for program execution and DH+ / RS-232 communication within SLC 500 controller platforms. The module provides 64K words of user memory for ladder logic processing and controller data handling.

Model Identification

The 1747-L543 is part of the SLC 5/04 processor family within the Allen-Bradley SLC 500 platform. The available catalog reference includes the standard hardware identifier 1747-L543 and spare model reference 1747L543.

Industrial Control Communication Characteristics

The 1747-L543 processor supports SLC 500 system communication through DH+ and RS-232 interfaces. DH+ communication provides controller-to-controller and operator interface connectivity, while the RS-232 port supports serial communication with compatible devices.

The Allen-Bradley SLC platform uses chassis-based I/O architecture with processor modules communicating through the SLC backplane. System configuration depends on installed I/O modules, power supply capacity, and application requirements.

The processor firmware compatibility must match the configured SLC 500 hardware environment. Program transfer, monitoring, and troubleshooting functions require compatible programming software and communication drivers.

Ordering Information

• 1 x Allen-Bradley 1747-L543 SLC 5/04 Processor Module
• 1 x Processor housing assembly
• 1 x Communication interface ports (DH+ and RS-232 integrated)
• 1 x SLC 500 compatible processor unit

Field Installation Guidelines

Chassis Installation

• Install the processor module only in a compatible Allen-Bradley SLC 500 chassis.
• Verify chassis power is removed before module insertion or removal.
• Confirm backplane connector alignment before securing the module.

Communication Wiring

• Use suitable shielded communication cable for RS-232 connections where required.
• Maintain separation between communication wiring and high-voltage power conductors.
• Connect DH+ network wiring according to SLC 500 network installation practices.

Configuration Check

• Verify processor configuration before loading application programs.
• Confirm communication parameters match connected devices.
• Avoid unauthorized firmware or memory modifications during operation.

Frequently Asked Questions

• What controller family does the 1747-L543 belong to?

The 1747-L543 is an Allen-Bradley SLC 5/04 CPU processor module designed for the SLC 500 programmable controller family.

• What communication ports are available on this processor?

The module provides DH+ and RS-232 communication interfaces for programming, monitoring, and system communication functions.

• How much user memory is available in the 1747-L543?

The processor provides 64K words of user memory for ladder logic programs, data tables, and controller configuration storage.

• Can the 1747-L543 operate in other PLC chassis platforms?

No. The processor is designed for installation in Allen-Bradley SLC 500 chassis systems and is not compatible with other controller platforms.

• Does the processor support Ethernet communication directly?

No. The provided specifications list DH+ and RS-232 communication ports. Ethernet requires additional compatible communication hardware.

• Is hot swapping supported for this processor module?

The processor should not be removed or installed under power unless the system documentation specifically permits the procedure.

• What software is required for programming the 1747-L543?

Programming requires software compatible with Allen-Bradley SLC 500 processors and the selected communication interface.

• What should be checked before replacing an existing processor?

Verify processor model compatibility, memory requirements, communication settings, and application program backup before replacement.