CHATTERING-INPUT
Input Data Incorrect (Chattering)
Mitsubishi Electric · MELSEC iQ-R I/O Module
What does CHATTERING-INPUT mean?
Incorrect input data is received due to chattering when a device with a high input response speed is connected to a contact output module. The rapid, transient fluctuations from contact bounce are interpreted as multiple, unstable input signals, leading to erroneous data processing.
Common Causes
- Connection of a device with a high input response speed to a contact output module.
- Contact chattering or bounce from the input device generating unstable signals.
- Inability of the contact output module to adequately filter rapid, fluctuating input signals.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Replace the contact output module with a transistor output module when interfacing with devices that have a high input response speed to mitigate chattering effects.
Verified technical data. Last updated: March 2026
Related Faults
Source: Mitsubishi Electric MELSEC iQ-R I/O Module