OVERVIEW

Official designation: Allen-Bradley 1746-A4 (SLC 500, I/O Chassis)

The 1746-A4 is a foundational 4-slot I/O chassis for the SLC 500 system. It provides essential mechanical mounting and an internal backplane for communication and power distribution to SLC modules.

KEY SPECS SUMMARY

Power: Chassis backplane only

Interfaces / Ports: Backplane connector

Indicators: N/A

Operating Temp: 0 to 60 degrees C

Platform / Compatibility: SLC 500 modules

Limit: 4 I/O slots total

Lifecycle: Discontinued

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What are the primary dimensions of the 1746-A4 chassis that must be considered during panel layout planning?

A: The nominal dimensions are 6.73 x 6.97 x 5.71 inches (width x height x depth).

Wiring & Installation:

Q: Can the 1746-A4 chassis be mounted in any orientation within an industrial control enclosure?

A: Chassis must be mounted horizontally to ensure proper ventilation and thermal management.

Troubleshooting & Compatibility:

Q: How is backplane power provided to the modules installed in the 1746-A4 chassis?

A: Power is supplied by a connected power supply module (e.g., 1746-P series) installed in the leftmost slot.

Replacement & Upgrades:

Q: What is the main replacement constraint when migrating from a small SLC 500 system utilizing the 1746-A4?

A: The physical chassis size and total slot count need to be replicated or consolidated in the new platform.