What Is the SLC 5/04 CPU?

The Allen-Bradley SLC 5/04 CPU is part of the SLC 500 family from Rockwell Automation, designed for small to mid-sized automation tasks. Known for its robust build and dependable performance, the SLC 5/04 stands out due to its DH+ (Data Highway Plus) communication capability, making it ideal for applications that require high-speed networking in a legacy control environment.

Though the SLC series is considered legacy, the SLC 5/04 processor is still widely used and supported in industrial facilities across the globe.

Key Features of the Allen-Bradley SLC 5/04 CPU

• ✅ Data Highway Plus (DH+) communication port

• ✅ RS-232 serial communication (DF1 or DH-485 protocols)

• ✅ Real-time clock for scheduling and data logging

• ✅ Support for RSLogix 500 programming software

• ✅ Memory options up to 32K words

• ✅ Modular compatibility with 1746 I/O chassis and modules

These features make the SLC 5/04 CPU perfect for industrial environments requiring fast data transfer between multiple PLCs, HMIs, and SCADA systems.

SLC 5/04 vs Other SLC CPUs

Here’s a quick comparison with other SLC models:

• SLC 5/03: Uses RS-232 and DH-485 communication, no DH+

• SLC 5/04: Adds DH+ support for high-speed networking

• SLC 5/05: Adds Ethernet/IP connectivity instead of DH+

The SLC 5/04 is ideal if your system is based on DH+ networks, which are still common in many established industrial environments.

Typical Applications of the SLC 5/04 CPU

The SLC 5/04 is used across various industries that rely on consistent and fast PLC-to-PLC or PLC-to-HMI communication, such as:

• Manufacturing assembly lines

• Automotive production systems

• Water and wastewater facilities

• Pharmaceutical processing

• Food and beverage packaging

Its proven reliability has made it a long-standing solution for many critical control systems.

Why Use the SLC 5/04 Today?

While newer platforms like CompactLogix and ControlLogix dominate modern automation, many facilities continue using SLC 500 systems due to:

• Existing infrastructure investment

• Proven stability and performance

• Availability of spare parts

• Familiarity among engineers and technicians

Where to Buy SLC 5/04 CPUs

At DDPARTS SOLUTION, we stock and ship SLC 5/04 CPUs and other Allen-Bradley legacy components worldwide. Whether you need a replacement, spare, or a complete system, our team can help source the parts you need with fast turnaround and expert support.

Final Thoughts

The Allen-Bradley SLC 5/04 CPU continues to serve industries that require a reliable, high-speed controller with DH+ networking. It's a legacy component that remains relevant, helping companies maintain uptime and operational continuity without costly upgrades.