The 1746-A4 is an Allen Bradley SLC 500 series 4-slot modular chassis, also called backplane rack, under Rockwell Automation Bulletin 1746 platform. It is officially discontinued since March 31, 2024 with no direct factory replacement from Rockwell, commonly sourced as spare part for legacy SLC 500 automation systemsRockwell A….

This 1746-A4 chassis provides four module slots to host SLC 500 processor unit, power supply, digital I/O, analog I/O and communication modules. The power supply mounts on the far left position of the rack, and the internal backplane handles data and power bus communication between all installed SLC modules. Multiple 1746 chassis can be linked together via chassis interconnection cables to expand the total I/O capacity of a SLC 500 control system, compatible with 1746-A7, 1746-A10 and 1746-A13 larger chassis models in the same family.

The 1746-A4 adopts panel mounting design for standard control cabinet installation. Natural convection cooling is required, no built-in fan. Operating temperature range is 0°C to 60°C, storage temperature -40°C to 85°C. Overall dimension is 17.1 cm × 17.7 cm × 14.5 cm. It is built for traditional cabinet-based PLC control and widely deployed in old production lines, material handling, packaging, water treatment and factory retrofit projects that still run SLC 500 controllersRockwell A….

Since the 1746-A4 is end-of-life, new original factory stock is no longer available from Rockwell channels. Our stock of 1746-A4 chassis are carefully inspected and tested before shipment, to support equipment maintenance, line repair and spare part backup for system integrators and end users maintaining legacy SLC 500 controls. If you are planning long-term migration, Rockwell’s recommended upgrade path is CompactLogix 5380 paired with Compact 5000 I/O modules as the modern alternative to SLC 500 platformRockwell A….

Compatible parts to pair with 1746-A4 include SLC 500 power supplies like 1746-P1, 1746-P2, 1746-P3, 1746-P4, SLC 5/03, 5/04, 5/05 processors, plus full range of 1746 digital and analog I/O modules. Contact us to check availability of matching chassis, power supply, CPU and I/O modules, request test report, datasheet or wiring guidance. We arrange secure packing and global delivery for industrial automation spare parts.

Related search terms: 1746-A4 datasheet, 1746-A4 backplane, 1746-A4 vs 1746-A7, SLC 500 rack, Allen Bradley SLC 500 spare chassis.

FAQ
What is 1746-A4?
1746-A4 is Allen Bradley SLC 500 4-slot chassis rack, the backplane base for SLC 500 PLC modules.

Is 1746-A4 discontinued?
Yes, Rockwell discontinued 1746-A4 effective March 31, 2024, no official replacement partRockwell A….

How many modules fit in 1746-A4?
It supports up to four SLC 500 modules including power supply, processor and I/O modules.

Can 1746-A4 connect to other SLC chassis?
Yes, it can be cascaded with 1746-A7, 1746-A10, 1746-A13 using chassis interconnect cables.

What is the upgrade solution for SLC 500 system?
Rockwell suggests migrating to CompactLogix 5380 controller and Compact 5000 I/O modules for new projects.

1746-A4