Automated PLC Code Quality Audit
Find Dead Code and Improve Reliability
Find dead code, duplicate logic, and missing documentation in your Allen-Bradley PLC programs. Upload your file and get an actionable quality report in seconds.
What Does PLC Code Quality Mean?
PLC code quality directly impacts plant uptime, maintenance efficiency, and operational safety. Unlike IT software, PLC programs control physical machinery -- poor code quality can lead to extended downtime, misdiagnosis during troubleshooting, and safety risks.
A high-quality PLC program has these characteristics:
- Every rung has a meaningful comment explaining its purpose
- All tags have descriptions for cross-reference clarity
- No dead code cluttering the program structure
- Consistent naming conventions across the entire project
- Reusable logic extracted into subroutines or AOIs
- Reasonable rung complexity for easy troubleshooting
Upload Your PLC File
Drag and drop your ACD, L5X, or RSS file. Your file is encrypted in transit and processed securely.
Automatic Analysis
The tool scans every routine, rung, tag, and instruction for quality issues against industry best practices.
Review Your Report
Get a prioritized list of findings with severity ratings, affected locations, and specific recommendations for improvement.
Common PLC Code Quality Issues
Our automated analysis checks your PLC program against industry best practices
Dead Code Detection
Find rungs disabled with AFI instructions, routines never called by JSR, and logic paths that can never execute. Dead code adds confusion and maintenance risk.
Unused Tag Detection
Identify tags that are defined but never referenced in any routine. Unused tags waste controller memory and create confusion for maintenance staff.
Duplicate Logic
Detect repeated instruction patterns across routines. Duplicate logic should be refactored into subroutines (JSR/SBR) or Add-On Instructions (AOIs).
Missing Documentation
Flag rungs without comments and tags without descriptions. Undocumented code is the number one cause of extended troubleshooting time on the plant floor.
Complex Rung Analysis
Identify rungs with excessive branch depth, too many instructions, or convoluted logic. Complex rungs are harder to troubleshoot and more prone to errors.
Quality Score
Get an overall quality score for your PLC program based on documentation coverage, code complexity, dead code ratio, and naming consistency.
Understand Your Quality Score
Your quality score is calculated from multiple factors that together represent the overall health of your PLC program. Each factor is weighted based on its impact on maintainability and reliability.
- Documentation coverage: percentage of rungs with comments and tags with descriptions
- Dead code ratio: percentage of disabled or unreachable rungs
- Tag utilization: ratio of referenced tags to total defined tags
- Complexity score: average instruction count and branch depth per rung
- Naming consistency: adherence to a single naming convention pattern
- Duplication index: frequency of repeated logic patterns across routines
Excellent
Well-documented, minimal dead code, consistent naming
Good
Minor issues found, some documentation gaps
Fair
Significant issues that should be addressed
Needs Work
Major quality issues impacting maintainability
Audit Any Allen-Bradley Program
Upload files from any Allen-Bradley controller family
Audit Your PLC Code
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Frequently Asked Questions
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.
How does the automated code quality analysis work?
Upload your ACD, L5X, or RSS file and the tool automatically scans every routine, rung, and tag in your project. It checks for common quality issues like unreferenced tags, AFI-disabled rungs, duplicate instruction patterns, rungs exceeding complexity thresholds, missing descriptions, and unused subroutines. Results are presented as an actionable report with a quality score and prioritized recommendations.
What PLC programming best practices does it check?
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 is a web-based tool and does not require Studio 5000 or any Rockwell Automation software. Upload your ACD, L5X, or RSS file and get a complete code quality report. This is especially useful for controls engineers who need to review programs on machines where they do not have a Studio 5000 license available.