What you'll learn
**Reported symptom:** The IO-Link sensor stays powered but repeatedly drops to COMLOST when the machine vibrates.
Lab time: ~14 minutes.
Lesson briefing
Intermittent IO-Link C/Q Conductor
Reported symptom: The IO-Link sensor stays powered but repeatedly drops to COMLOST when the machine vibrates.
The circuit was commissioned from a known-good drawing. Treat every terminal as suspect, but test from source to load instead of guessing. Use voltage mode on an energised control circuit and continuity only after the simulated circuit is isolated.
Your task
Use master port diagnostics and a controlled flex/wiggle test to separate device power from communication continuity.
Choose the fault category only when the measurements support it.
Hints
Stable L+ and L− with COMLOST narrows the fault to C/Q, configuration or the device.
Sign up to unlock the full hint sequence.
Sign up to unlock the full hint sequence.
Sign up to unlock the full hint sequence.
This lesson uses 7 placed components on the lab canvas. Components are vendor-neutral (no proprietary trademarks); the wiring rules apply to any equivalent industrial part.
Sign up to preview
Create a free account to preview this Pro lab; upgrade to open the interactive circuit.
Sign up to preview →