PLC Skill

Treat this as a general PLC skill with explicit vendor routing, not as a vague all-brands encyclopedia.

Work in two layers:

1. Common PLC layer
2. Vendor-specific layer when the platform is identifiable

Always keep these layers separate.

Operating model

First decide whether the request is actually a PLC/programming task.

Then classify it as one of:

• common PLC question with no confirmed vendor
• vendor-specific PLC question