Introduction
Allen-Bradley PLCs have been a cornerstone of industrial automation for decades, powering everything from small standalone machines to large-scale factory operations. Over the years, Rockwell Automation has developed different programming platforms for these controllers, each suited to specific hardware families. One of the most notable is RSLogix 500, a legacy programming software that, despite its age, remains widely used in plants and facilities worldwide.
This blog explores which Allen-Bradley Micrologix 1400 PLC models are programmed with RSLogix 500. We’ll cover the supported families, explain which newer PLCs require alternative software, and highlight why this distinction is so important for engineers, technicians, and maintenance teams managing automation systems today.
Overview of RSLogix 500 Software
RSLogix 500 was developed specifically for the SLC 500 and MicroLogix series of controllers. At the time of its release, it simplified programming by offering a user-friendly ladder logic environment, which mirrored traditional relay logic diagrams that many electricians and technicians were already familiar with.
Some of its most recognized features include:
- Ladder Logic Programming: Easy to understand and adopt for users with electrical backgrounds.
- Straightforward Interface: Less complex than newer platforms, making it accessible for beginners.
- Diagnostics and Troubleshooting Tools: Users can monitor data tables, watch real-time program execution, and track faults with relative ease.
While newer software like Studio 5000 has since taken over, RSLogix 500 continues to be important in maintaining legacy systems. Many facilities still run equipment that was installed 10, 15, or even 20 years ago, and upgrading those systems isn’t always financially or operationally practical. As a result, RSLogix 500 remains a key tool for industrial maintenance teams.
Allen-Bradley PLC Models Compatible with RSLogix 500
a) SLC 500 Series
The SLC 500 family is one of Allen-Bradley’s most successful controller lines. These rack-based PLCs were widely adopted across manufacturing plants, process industries, and utilities throughout the 1990s and early 2000s.
Even though they are now considered legacy hardware, many systems remain operational, and Rockwell Automation still provides support for maintenance purposes. All SLC 500 controllers are fully supported by RSLogix 500, making the software an essential tool for extending the life of these installations.
b) MicroLogix Family
The MicroLogix family was designed as a compact, cost-effective solution for smaller applications. These controllers are standalone, simple to set up, and ideal for businesses that don’t need large rack-based PLCs.
Every model in the MicroLogix series uses RSLogix 500, including:
- MicroLogix 1000
- MicroLogix 1100
- MicroLogix 1200
- MicroLogix 1400
- MicroLogix 1500
These PLCs gained popularity in packaging, food processing, HVAC, and small machine control applications. Their affordability and flexibility made them a go-to choice for OEMs and small manufacturers.
PLC Models Not Supported by RSLogix 500
As technology advanced, Rockwell introduced newer platforms that required more powerful software. The following PLC families are not compatible with RSLogix 500:
- ControlLogix
- CompactLogix
- FlexLogix, SoftLogix, and DriveLogix
These models use RSLogix 5000 (later renamed Studio 5000), which introduced a modern, tag-based programming environment. Unlike the address-based logic of RSLogix 500, Studio 5000 allows users to create descriptive, reusable tags, making it more scalable and suitable for large, complex automation systems.
Why It Matters for Engineers and Maintenance Teams
Understanding which PLC models align with RSLogix 500 versus Studio 5000 is more than a technical detail—it has real implications for system management:
- Maintenance vs. Upgrades: Facilities with SLC 500 or MicroLogix controllers must continue using RSLogix 500 for programming and troubleshooting unless they commit to a costly migration.
- Cost Considerations: RSLogix 500 is still licensed software, but upgrading to Studio 5000 often involves both hardware and software investments.
- Transition Challenges: Moving from address-based to tag-based programming requires retraining teams and adapting existing logic.
For engineers and technicians, knowing the software compatibility helps avoid wasted time, ensures proper planning, and supports smoother upgrades.
Practical Scenarios
To see how this plays out in real-world settings, consider the following examples:
- Example 1: Plant with SLC 500 Controllers
A factory floor still operates on SLC 5/04 processors installed 20 years ago. RSLogix 500 remains the go-to software for making adjustments and troubleshooting without replacing entire racks of hardware. - Example 2: Small Business with MicroLogix 1400
A packaging company uses MicroLogix 1400 to automate a labeling machine. Its low cost and built-in Ethernet port make it perfect for their standalone system, and all programming is handled via RSLogix 500. - Example 3: Upgrading to CompactLogix
A manufacturer decided to modernize by moving from MicroLogix 1200 to CompactLogix. This shift requires Studio 5000, meaning the engineering team must adapt to tag-based programming and purchase new software licenses.
Conclusion
To summarize, RSLogix 500 supports two main Allen-Bradley PLC families: the SLC 500 and all MicroLogix models. These controllers remain common in legacy and small-scale applications, and the software is still widely used for maintenance and troubleshooting.
However, it’s important to note that modern Logix platforms such as CompactLogix and ControlLogix are not compatible with RSLogix 500. Instead, they require Studio 5000. For engineers, understanding this distinction ensures the right tools are used for the right systems, ultimately saving time, money, and frustration.
FAQs
Q1. Which PLC models are compatible with RSLogix 500?
RSLogix 500 supports the SLC 500 series and all MicroLogix PLCs (1000, 1100, 1200, 1400, and 1500).
Q2. What software do CompactLogix and ControlLogix PLCs use?
CompactLogix and ControlLogix require Studio 5000 (formerly RSLogix 5000), not RSLogix 500.
Q3. Is RSLogix 500 still supported?
Yes, RSLogix 500 is still supported for legacy systems. However, Rockwell Automation recommends using Studio 5000 for all new projects and modern hardware.
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