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ErrorLib — Industrial Fault Code Library

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F70B

Response Wait Timeout

Mitsubishi Electric · MELSEC Q-series MELSECNET/H

What does F70B mean?

A response to a communication request was not received within the expected waiting period, leading to a timeout error. This is a general communication issue.

Common Causes

  • Delays in network response
  • Network congestion
  • Issues with the responding station

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Retry the communication instruction after a short interval

  2. 2

    If the error persists, investigate network latency or the status of the responding station

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

F105Initial Status with Baton/Data Link IssueF106Control/Sub-control Station Shift StatusF107Baton Pass Error (Baton Lost)
Source: Mitsubishi Electric MELSEC Q-series MELSECNET/H
Open Manual (Page 165)Search more codes in this manual