Open ACD Files
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View ControlLogix and CompactLogix programs without a Studio 5000 license. Upload your ACD file and instantly browse ladder logic, tags, and get AI explanations.
The Studio 5000 Project Format
ACD files are the native project format for Studio 5000 Logix Designer, Rockwell Automation's software for programming ControlLogix and CompactLogix PLCs. Every ACD file contains:
- Controller configuration and firmware settings
- All programs and routines (ladder, function block, ST)
- Controller-scoped and program-scoped tags
- User-Defined Data Types (UDTs) and AOIs
- I/O module configuration and mapping
- Online edit history and pending changes
Studio 5000 is Expensive
$5,000-$7,000 for a professional license plus annual fees
Limited License Seats
Not everyone who needs to view code has access
Slow to Load
Full IDE is overkill when you just need to review code
Requires Installation
Can't quickly view files on any computer
Everything You Need to Understand ACD Files
Professional ACD file viewing without the professional price tag
Ladder Logic Viewer
See all your rungs with color-coded instructions. Identify inputs, outputs, timers, and counters at a glance.
Complete Tag Browser
Browse all tags with data types, descriptions, and UDT structures. Search and filter to find what you need.
AI-Powered Explanations
Get plain-English explanations of what each rung does. Perfect for understanding unfamiliar code.
Program Structure
Navigate tasks, programs, and routines in a tree view. Understand how your project is organized.
Secure & Private
Files are encrypted in transit, processed on isolated infrastructure, and accessible only to your account.
Instant Results
Upload and view your ACD file in seconds. No waiting for slow software to initialize.
Cross-Reference & Signal Tracing
Find where any tag is used across the entire project. Trace signals from input to output in seconds.
Device Classification
Automatic identification of sensors, motors, valves, and safety devices from tag naming conventions.
Safety & Alarm Analysis
Detect safety-critical logic and alarm conditions. Full GuardLogix support with safety routine identification.
Program Comparison
Diff two versions of your ACD project 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, network topology, and rack layout. See catalog numbers, point counts, and module configuration.
I/O Visualization
Interactive rack view showing every I/O point, signal names, and LED status. Click any point to see its tag assignments.
Supported Controllers
Works with all Logix family controllers from Allen-Bradley
ControlLogix
1756 series high-performance controllers for complex applications
CompactLogix
1769 series mid-range controllers for machine control
GuardLogix
Safety-rated controllers for safety-critical applications
Frequently Asked Questions
What is an ACD file?
An ACD file is the native project format for Studio 5000 Logix Designer, Rockwell Automation's programming software for ControlLogix and CompactLogix PLCs. It contains the complete project including programs, tags, I/O configuration, and online edit history.
Can I open ACD files without Studio 5000?
Yes! PLC Company lets you open and view ACD files directly in your browser without needing Studio 5000 installed. You can browse all programs, routines, tags, and get AI-powered explanations of your ladder logic.
What's the difference between ACD and L5X files?
ACD is the native binary project format that Studio 5000 uses to save projects. L5X is an XML-based export format. ACD files contain additional information like online edit history and pending changes. Both contain your complete PLC program and are supported by our viewer.
Which controllers use ACD files?
ACD files are the project format for all Logix family controllers: ControlLogix (1756), CompactLogix (1769), and GuardLogix safety controllers. The format is used by Studio 5000 Logix Designer across all versions.
How much does Studio 5000 cost?
Studio 5000 Logix Designer Professional edition costs approximately $5,000-$7,000 for a perpetual license, plus annual maintenance fees. PLC Company provides an alternative for viewing and understanding your programs without needing Studio 5000.
Is my ACD file secure when I upload it?
Yes. Your ACD 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.