Nothing close enough? Start from a blank block diagram → Describe it in one paragraph.
How to use a block diagram template.
- 01Pick a template or start blank
Open the block diagram tool and choose a process control example close to your use case, or start with an empty canvas.
- 02Add system blocks
Drag and drop blocks for the plant, controller, sensor, and actuator. Use standard shapes: summing junctions, take-off points, and signal lines.
- 03Connect and label signals
Draw arrows to show signal flow — setpoint, error, manipulated variable, and output. Label each line with its transfer function or variable name.
- 04Annotate parameters
Add text for PID gains, time constants, dead time, and other tuning parameters. Include units and descriptions for clarity.
- 05Style and export
Apply color coding, adjust line widths, and align boxes. Export as PNG, SVG, or PDF for reports, presentations, or further editing.
Questions about block diagram templates
What is a process control block diagram?
It’s a graphical representation of a control loop, showing blocks (controller, plant, feedback elements) and signals (error, control action, process variable) to analyze system behavior and stability.
Which symbol represents a summing junction?
A small circle with a plus and/or minus sign, where the feedback signal is subtracted from the setpoint to produce the error signal.
Can I model a PID controller with this tool?
Absolutely. Use the function block library or label a block with the PID transfer function (Kp + Ki/s + Kd*s). You can even break it into separate P, I, D paths for clarity.
Is the block diagram maker free to use?
Yes, it is free with a free account. No credit card is needed. All templates and export options are included without watermarks.
How do I add a disturbance input?
Add an extra signal line from a ‘disturbance’ block to a summing junction located between the actuator and the plant. Label it appropriately, e.g., ‘d(t)’.