Open RSS Files
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View RSLogix 500 programs without expensive software. Upload your RSS file and instantly browse ladder logic, data tables, and I/O configuration for SLC 500 and MicroLogix PLCs.
Supported Legacy Platforms
The RSLogix 500 Project Format
RSS files are the native project format for RSLogix 500, Rockwell Automation's programming software for SLC 500 and MicroLogix PLCs. These files contain everything about your PLC program:
- Ladder logic programs (LAD files)
- Data tables (integers, timers, counters, floats)
- I/O configuration and addressing
- Processor configuration
- Documentation and comments
RSLogix 500 Discontinued
Rockwell no longer sells new licenses - existing users are stranded
Expensive Legacy Licenses
Used licenses sell for $1,000+ on secondary markets
Compatibility Issues
Old software struggles on modern Windows versions
Millions of PLCs Still Running
SLC 500 and MicroLogix remain in production worldwide
Everything You Need for Legacy PLC Support
View and understand SLC 500 and MicroLogix programs without RSLogix 500
Ladder Logic Viewer
View all ladder files with color-coded instructions. See XIC, XIO, OTE, timers, counters, and math instructions clearly.
Data Table Browser
Browse all SLC 500 data tables: O, I, S, B, T, C, R, N, F, A, and string tables. See addresses and values.
AI-Powered Explanations
Get plain-English explanations of what each rung does. Perfect for understanding unfamiliar legacy code.
No Software Required
Works entirely in your browser. No RSLogix 500 license, no installation, no compatibility issues.
Secure & Private
Files are encrypted in transit, processed on isolated infrastructure, and accessible only to your account.
Instant Results
Upload and view your RSS file in seconds. No waiting for slow software to load.
Cross-Reference & Signal Tracing
Find where any address is used across the entire project. Trace signals from input to output quickly.
Device Classification
Automatic identification of sensors, motors, valves, and safety devices from your I/O configuration.
Safety & Alarm Analysis
Detect safety-critical logic and alarm conditions in your SLC 500 and MicroLogix programs.
Program Comparison
Diff two versions of your RSS program side by side. See exactly what changed between revisions.
Training Document
Auto-generated operator training covering safety procedures, device reference, alarm response, I/O maps, and daily operations.
Hardware Browser
Browse I/O modules with inferred catalog numbers and point counts. See chassis layout and module configuration.
I/O Visualization
Interactive rack view showing I/O points inferred from ladder logic address usage. See slot assignments and signal names.
Frequently Asked Questions
What is an RSS file?
An RSS file is the native project format for RSLogix 500, Rockwell Automation's programming software for SLC 500 and MicroLogix PLCs. It contains the complete PLC program including ladder logic, data tables, I/O configuration, and documentation.
Can I open RSS files without RSLogix 500?
Yes! PLC Company lets you open and view RSS files directly in your browser without needing RSLogix 500 installed. You can browse ladder logic, view data tables, and understand program structure.
Which PLCs use RSS files?
RSS files are used by SLC 500 processors (5/01, 5/02, 5/03, 5/04, 5/05) and MicroLogix controllers (1000, 1100, 1200, 1400). These legacy platforms are still widely used in manufacturing facilities worldwide.
Is RSLogix 500 still available?
RSLogix 500 has been discontinued by Rockwell Automation. While existing licenses continue to work, new licenses are no longer sold. This makes alternative viewers like PLC Company essential for maintaining legacy systems.
How do I export an RSS file from RSLogix 500?
In RSLogix 500, go to File > Save As and save your project. The default format is .RSS. You can then upload this file directly to PLC Company without any conversion needed.
Is my RSS file secure when I upload it?
Yes. Your RSS file is encrypted in transit and processed on secure, isolated infrastructure. Parsed data is stored in your private account and is never shared with third parties. You can permanently delete your files at any time.