Allen-Bradley 1746-A10 SLC 500 PLC Rack Chassis

The Allen-Bradley 1746-A10, also cataloged as the 1746-A10 PLC Rack Chassis, operates as a dedicated backplane mechanical and electrical carrier for SLC 500 I/O and processor modules within modular PLC architectures. Configured for panel-mounted system expansion, the Allen-Bradley 1746-A10 provides direct backplane distribution across 10 slot positions for SLC 500 module integration.

Suffix Breakdown & Model Matrix

The 1746-A10 model follows SLC 500 chassis naming convention:

• 1746: SLC 500 platform identifier

• A10: 10-slot chassis configuration
  No further functional segmentation or electrical option coding is defined at chassis level.

Hardware Specifications

Backplane Bus Architecture and I/O Density Scaling

Within the SLC 500 system, the 1746-A10 chassis provides passive backplane bus routing for processor and I/O modules. Electrical distribution at 5.1 VDC and 24 VDC rails defines module population limits and system expansion boundaries. Chassis interconnection capability enables extended I/O density scaling across multiple racks via dedicated interconnect cabling, maintaining synchronized backplane communication across linked units.

Frequently Asked Questions (FAQ)

Q: Can the 1746-A10 chassis be hot-swapped while powered?
A: No. Chassis installation or removal requires system power removal to prevent backplane bus disruption and module damage.

Q: What determines module population limits in the chassis?
A: Slot count (10 positions) and total backplane current budget (5.1 VDC and 24 VDC rails) define allowable module loading.

Q: Does chassis interconnection extend backplane signal integrity across racks?
A: Yes. Interconnect cables propagate backplane signals across connected chassis, but total cable length and load must remain within SLC 500 system specifications.

Field Installation Guidelines

The chassis must be secured using all mounting tabs with appropriate SEM or star washer screws to ensure mechanical stability under vibration. Panel surface shall provide flat contact to avoid chassis deformation affecting backplane alignment. Maintain separation between interconnect cabling and high-noise power conductors to reduce induced interference on backplane rails. Ensure proper grounding of chassis frame to a single-point earth reference to stabilize system reference potential across connected racks.