Introduction
RSLogix 500 is one of Rockwell Automation’s most familiar programming tools, closely tied to the Allen-Bradley SLC 500 and MicroLogix PLC families. While it’s now considered legacy software, it played a huge role in the growth of industrial automation and is still widely used today.
Even though newer platforms like Studio 5000 handle CompactLogix and ControlLogix systems, RSLogix 500 remains essential wherever SLC 500 and MicroLogix controllers are still running. Many factories, processing plants, and even training programs rely on it daily for programming, troubleshooting, and system upkeep.
It’s worth noting that RSLogix 500 is not compatible with CompactLogix or ControlLogix—those require RSLogix 5000/Studio 5000. Instead, its strength lies squarely in supporting the SLC 500 and MicroLogix families, where it continues to deliver reliability and ease of use.
Supported PLC Families
SLC 500 Series
The SLC 500 series was one of Allen-Bradley’s most successful product lines and became the backbone of many industrial systems starting in the 1990s. These PLCs were built around a modular, rack-based design, meaning users could combine processor units with various input/output (I/O) modules to scale their systems according to project needs. This flexibility allowed them to serve everything from small manufacturing lines to larger, more complex operations.
What made the SLC 500 particularly attractive was its scalability and durability. Companies could start small and add on as their automation requirements grew, all while maintaining a stable and reliable control platform. Some of the commonly used processors in this family included the 1747-L20, 1747-L30, 1747-L40, 1747-L542, 1747-L543, 1747-L551, 1747-L552, 1747-L553, and 1747-L554 models. Each offered different levels of memory, processing power, and I/O capabilities, making them suitable for a wide range of industrial tasks.
Programming for the SLC 500 was done exclusively through RSLogix 500. The software provided a ladder logic programming environment, which mimicked traditional relay logic diagrams, making it easier for technicians with electrical backgrounds to adapt to PLC programming. Even today, SLC 500 units are found in countless plants worldwide, and RSLogix 500 remains indispensable for keeping them operational.
MicroLogix Family
The SLC 500 series worked well for medium and larger projects, but Rockwell Automation realized that many businesses needed something simpler, smaller, and more affordable. That’s where the MicroLogix family came in. These controllers were designed to be compact and cost-effective, while still delivering many of the core functions of larger PLCs. In short, they gave users the power of automation in a streamlined, space-saving package.
The MicroLogix lineup includes the 1000, 1100, 1200, 1400, and 1500 models. Each new release added useful upgrades—whether it was more memory, greater I/O capacity, or better communication options. A good example is the MicroLogix 1400, which came with built-in Ethernet ports. This made it far easier to connect with modern industrial networks, all while keeping the familiar RSLogix 500 programming environment.
One of the biggest advantages of the MicroLogix family was its flexibility in communication. Depending on the model, these PLCs supported RS-232, RS-485, and Ethernet, giving them the ability to fit into a wide range of applications. They could be used for standalone machines, small production cells, or even as part of a connected system.
Just like the SLC 500 series, every MicroLogix controller was programmed with RSLogix 500. This consistency made it easy for technicians and engineers to move between different models without having to learn an entirely new system, which is one reason the MicroLogix family became so widely adopted.
RSLogix 500 Key Features
One of the reasons RSLogix 500 became so widespread was its programming style. It primarily uses Ladder Logic (LD), which closely resembles electrical relay diagrams. This approach meant electricians and technicians who were already familiar with relay systems could quickly adapt to PLC programming without needing to learn an entirely new language.
Another strength of RSLogix 500 is its connectivity. By working in tandem with RSLinx Classic, the software enabled communication with controllers through RS-232, RS-485, or Ethernet connections. This made it possible to connect directly to the PLC for programming or troubleshooting, whether on the plant floor or from a connected workstation.
The simplicity of the interface also contributed to its long-lasting popularity. RSLogix 500 provided a user-friendly environment where programs could be created, edited, and monitored in real time. These characteristics made it a staple not only in industry but also in educational and training institutions, where many engineers took their first steps into PLC programming.
Applications of RSLogix 500 continue to span legacy system maintenance, small-to-medium automation tasks, and educational platforms. Even though newer software platforms now exist, RSLogix 500’s reliability and ease of use keep it relevant wherever older PLCs remain in operation.
Important Notes
RSLogix 500 has a few important limitations. It does not work with Rockwell’s newer CompactLogix or ControlLogix controllers, which require RSLogix 5000 or Studio 5000. It’s also worth noting that the SLC 500 and MicroLogix families are nearing end of life, with Rockwell gradually phasing them out.
Even so, countless facilities still depend on these PLCs every day. Replacing or upgrading them takes time, money, and planning, which is why RSLogix 500 remains such a critical tool. Without it, maintaining and troubleshooting older systems would be far more difficult and risky.
Conclusion
In short, RSLogix 500 is the go-to software for SLC 500 and MicroLogix PLCs. While it’s considered legacy, it continues to play a vital role in keeping existing equipment running smoothly in plants, factories, and training environments worldwide.
Yes, the industry is moving toward Studio 5000 and, click here to read more.
