What is Version Control?
Version Control is a method for tracking, comparing and reverting changes in files, configurations or code. It is used to ensure consistency and traceability in development and management processes.
In industrial automation and IT/OT environments, version control is applied to PLC programs, SCADA projects, Firmware, scripts and configuration files.
🎯 Why is version control important?
- Prevents changes from being lost
- Makes it possible to revert to a stable version
- Compares differences between versions (diff)
- Supports audit trails and compliance (e.g. GAMP, GxP)
- Essential for collaboration between multiple engineers or teams
🧱 Types of version control
| Type | Description |
|---|---|
| Manual | Local file copies (V1, V2_final, etc.) – error-prone |
| File-based | Storage in folders with changelogs and backups |
| Software-based | Tools such as Git, SVN or TIA Portal VCS |
| Industrial VCS | Specifically for PLC/SCADA environments, e.g. AUVESY MDT, Versiondog |
🛠 What can you manage with version control?
- PLC code (ladder diagram, structured text)
- SCADA configuration files
- HMI screens and recipes
- Firmware updates and settings
- Network or fieldbus configurations
- Script code or automation scripts (e.g. Python, PowerShell)
🔐 Connection with security and compliance
- Helps with change management
- Meets requirements from ISO 9001, GAMP, FDA, IEC 61511
- Supports rollback in case of errors or incidents
- Can be combined with Backup and Disaster Recovery strategies
✅ Benefits of Version Control
- Better collaboration between engineers and departments
- Traceability of every change
- Faster recovery from errors or disruptions
- Safe management of code and configurations
- Automatic logging of who, what and when
📌 In summary
Version Control is indispensable for controlled changes in industrial systems and contributes to the reliability, quality and Compliance of software and configurations.