FBD Editor — Function Block Diagram
The Function Block Diagram editor models control logic as a network of blocks with data flowing left to right. It is the natural language for continuous processes and reusable control modules.
Editor Capabilities
- Block palette — boolean, comparison, arithmetic, selection, and timer/counter blocks; plus your own library blocks
- Free placement and routing — drag blocks onto the sheet; connections route automatically with manual override
- Typed connections — incompatible data types cannot be wired; mismatches are flagged inline
- Nesting and reuse — save any FBD network as a function block for reuse across projects
- Sheets — split large diagrams across ordered sheets with off-page connectors
AI/MCP Assistance in FBD
- Describe the control strategy — KVPAC proposes a block network
- Ask what a legacy FBD sheet does and receive a structured explanation
- Detect duplicated networks and extract them into reusable blocks
Simulation and Debugging
- Wire value watching shows live data on every connection
- Toggle block enables to isolate sections during simulation
- Breakpoints on block execution
Who Uses FBD
Engineers building analog control loops, alarm handling, and modular machine functions where signal flow is clearer than relay logic.