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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

F7C1

Host Channel In Use

Mitsubishi Electric · MELSEC Q-series MELSECNET/H

What does F7C1 mean?

The host station is attempting to use a channel that is already active or in use by another process. This prevents concurrent use of the same channel.

Common Causes

  • The same channel number is being accessed or used by multiple instructions or processes concurrently on the host station

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Change the channel number being used by the conflicting instruction or process

  2. 2

    Restructure the sequence logic to prevent simultaneous use of the same channel

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