Code Quality Analysis — PLC Audit Tool
Find Dead Code and
Improve Reliability
Automated audit detects unused tags, dead rungs, missing documentation, and naming violations in Allen-Bradley PLC programs. No Studio 5000 required.
- PLC code quality audits find unused tags, dead rungs, undocumented elements, and naming violations.
- In our testing, a typical ControlLogix program has 15-30% unused tags accumulated over its service life.
- plc.company generates a full quality report with exportable spreadsheet in under 30 seconds.
- No Studio 5000 required — upload your ACD or L5X file for an instant audit.
What the Audit Checks
Dead Code Detection
Find rungs that never execute under any input condition. Identifies orphaned logic left over from equipment changes or program revisions.
Unused Tag Identification
List all tags that are declared but never read or written. These consume valuable memory and create confusion during maintenance.
Missing Documentation
Identify rungs without comments and tags without descriptions. Flag tags and routines that lack proper documentation for future maintainers.
Naming Violations
Detect inconsistent naming patterns and flag tags that violate Rockwell Automation naming conventions.
Duplicate Logic Detection
Find similar code sequences across routines that could be consolidated into reusable logic or subroutines.
Complexity Analysis
Identify rungs with excessive branch depth, too many instructions, or convoluted logic. Complex rungs are harder to troubleshoot and more prone to errors.
How to Audit Your Code
Export your PLC file
Export your Allen-Bradley PLC program as an ACD or L5X file from Studio 5000 Logix Designer.
Upload to plc.company
Go to plc.company and upload your ACD or L5X file. The code quality audit runs automatically.
Review the audit report
See a breakdown of unused tags, dead rungs, naming violations, and undocumented elements.
Export findings
Download the code quality report as a spreadsheet to share with your team or track remediation.
Audit Your PLC Code
Upload your Allen-Bradley file to run an instant code quality analysis
Drop your PLC file here
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FAQ
What is a PLC code quality audit?
A PLC code quality audit is a systematic review of your PLC program to identify issues that affect maintainability, reliability, and performance. This includes finding dead code (rungs that never execute), unused tags consuming memory, duplicate logic that should be consolidated, missing rung comments, overly complex rungs, and inconsistent programming patterns. A quality audit helps teams maintain cleaner, more reliable PLC programs.
What quality checks does the audit include?
The audit checks against industry-recognized PLC programming best practices including: every rung should have a comment, tags should have descriptions, avoid excessively long rungs (more than 10 instructions), eliminate dead code and unused tags, minimize duplicate logic across routines, use consistent naming conventions, avoid hardcoded values without documentation, and ensure proper use of safety-rated instructions in safety routines.
Can I run a code quality audit without Studio 5000?
Yes. plc.company runs code quality audits on your ACD or L5X files directly in the browser. No Studio 5000 license required. Simply upload your file and the audit runs automatically, generating a detailed report with findings and recommendations.
How long does a code quality audit take?
Most audits complete in under 30 seconds, regardless of program size. The analysis runs on our secure infrastructure and generates a comprehensive report covering dead code, unused tags, naming violations, missing documentation, and complexity metrics.
Can I export the audit results?
Yes. Audit results can be downloaded as a spreadsheet in CSV format, including all findings, affected tags/rungs, severity levels, and remediation recommendations. This makes it easy to track issues and share with your team.
What does 'dead code' mean in PLC programs?
Dead code refers to rungs, branches, or subroutines that never execute under any input condition. This typically happens after code is modified or equipment changes over time. Dead code consumes memory, increases confusion during troubleshooting, and may harbor latent bugs if conditions change.
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