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. 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.

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Verified technical data. Last updated: March 2026

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Source: Mitsubishi Electric MELSEC iQ-R I/O Module