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How is the OPC-DA file structured for importing tags with folders?
This article applies to MetaDefender Optical Diode / NetWall Diode.
Overview
This page explains how to structure a file for importing OPC-DA tags, including how folders and tags are defined within a single import file.
Key Concepts
1. Single File, Multiple Folders
- You do not need to import folders separately.
- A single file can define and load multiple folders.
- Each folder is declared using a special directive.
2. Folder Definition (#folder)
The #folder directive defines where tags will be organized.
Format:
#folder,<top folder>,<sub folder>Notes:
- Values are separated by commas.
- Both top-level and sub-folder must be provided.
3. Tag Assignment
- All lines following a
#folderdefinition belong to that folder. - Tags use dot notation, not commas.
Format:
<FolderName>.<TagName>4. File Format Clarification
{info:title=Important} Although the file resembles a CSV, it may not look like a typical one.
- The separator is a comma (,) — not a space.
- Tag lines themselves do not use commas. {info}
Example File Structure
#folder,Simulation Items,Bucket BrigadeBucket Brigade.BooleanBucket Brigade.Int2#folder,Simulation Items,Saw-toothed WavesSaw-toothed Waves.Int1Saw-toothed Waves.Int2How It Works
The system reads the #folder line.
All following tag entries are assigned to that folder.
When a new #folder appears, subsequent tags are assigned to the new folder.
Best Practices
- Always define folders before listing tags.
- Keep naming consistent between folder names and tag prefixes.
- Avoid unintended extra spaces.
- Ensure correct comma placement in
#folderlines.
Common Pitfalls
|| Issue || Explanation ||
| Using spaces instead of commas | Breaks folder parsing |
| Using commas in tag lines | Invalid format |
| Missing #folder before tags | Tags may not be assigned correctly |
| Inconsistent naming | Causes mismatched folder/tag mapping |
Summary
{panel:title=Quick Summary}
- Use
#folderto define folder structure - Use comma-separated values only for folder definitions
- Use dot notation for tags
- Multiple folders can be handled in a single import file {panel}
If Further Assistance is required, please proceed to log a support case or chat with one of our support engineers.
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