Allen-Bradley 1747-L552C SLC 5/05 Processor Module

The Allen-Bradley 1747-L552C, also cataloged as the 1747-L552C CPU processor module, serves as the primary SLC 5/05 controller utilized to execute scan-cycle logic processing across SLC 500 backplane-based control architectures.

Configured for deterministic program execution and Ethernet-based data exchange within SLC 500 systems, the Allen-Bradley 1747-L552C (1747-L552C CPU processor module) provides direct backplane instruction handling with integrated RS-232 and TCP/IP communication interfaces.

Suffix Breakdown & Model Matrix

The suffix “C” denotes a specific revision or hardware configuration variant within the 1747-L552C series. No additional segmentation data is defined in the provided dataset. No functional option codes are disclosed.

Hardware Specifications

Backplane Communication & EtherNet/IP Deterministic Execution Behavior

The SLC 5/05 architecture executes program logic through backplane arbitration cycles, where instruction scanning is synchronized with chassis-level data exchange timing. Ethernet communication is handled via TCP/IP messaging integrated into the scan process, introducing scan-dependent latency under heavy I/O loads. The controller maintains fixed-cycle execution behavior, with memory-resident program blocks processed sequentially under deterministic scan control. Firmware execution and communication stack operations are tied to backplane bandwidth allocation and I/O density scaling limits.

Frequently Asked Questions (FAQ)

Q: Can the 1747-L552C CPU be hot-swapped during operation?
A: No. Removal or insertion under energized backplane conditions is not supported and may disrupt chassis communication integrity.

Q: Does Ethernet communication operate independently of scan cycle timing?
A: No. Ethernet TCP/IP messaging shares CPU scan resources, and throughput is affected by scan cycle load and instruction density.

Q: Is firmware backward compatible across all SLC 5/05 revisions?
A: Firmware compatibility depends on controller revision alignment; mismatched firmware may prevent program download or online mode operation.

Field Installation Guidelines

Power to the SLC 500 chassis shall be fully removed prior to installation. The CPU module must be fully seated into the backplane connector to ensure stable bus communication. Shielded Ethernet cabling shall be routed separately from high-noise motor or relay wiring to minimize electromagnetic coupling. RS-232 programming interface shall use short, shielded cable runs where possible. Chassis grounding integrity must be verified before system energization to maintain stable reference potential for communication signaling.