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Stop Conveyor When a Box Is Present at the Input

Learn how to add a monitoring thread that pauses the conveyor when the input sensor detects a box

Context

This article explains how to prevent boxes from pushing against each other at the infeed by automatically stopping the conveyor when the input sensor detects a box.
Stopping the conveyor also helps reduce energy consumption when it is not needed.

Information

1. Prepare the conveyor state

  • In the BeforeStart section, set the conveyor to Off at initialization.

2. Add a monitoring thread

  • Create a new Thread in the program tree.

  • Inside the thread, add an If statement that checks the input sensor.

3. Define conveyor behavior

  • If the input sensor detects no box, set:

    • Set conveyor = On

  • If the input sensor detects a box, set:

    • Set conveyor = Off

4. Synchronize with the main program

  • At the end of the thread, insert the command sync().

  • This keeps the monitoring thread aligned with the main program execution.

Conclusion

By adding this monitoring thread, the conveyor runs only when needed and automatically pauses when a box is detected at the input.
This setup avoids collisions between boxes and helps save energy during palletizing.

Updated: August 2025