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ErrorLib — Industrial Fault Code Library

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F008

Cannot complete request

Allen-Bradley · Logix 5000

What does F008 mean?

A request could not be completed because the situation changed during a multipacket operation, indicating a timing or state issue. The system's state altered unexpectedly during a communication sequence.

Common Causes

  • Situation changed during multipacket operation

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect physical network cabling and connectors for the affected Logix 5000 communication module for damage, proper seating, and secure connections.

  2. 2

    Monitor Logix 5000 controller CPU utilization and program scan time in Logix Designer to identify potential resource contention or overruns.

  3. 3

    Verify communication module (e.g., EtherNet/IP) diagnostic indicators and check module-specific fault logs within Logix Designer for communication errors.

  4. 4

    Review the network switch port configuration connected to the Logix 5000 for duplex mismatches, speed issues, or excessive error counts (CRC, dropped packets).

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

Related Faults

00D0No block-transfer response (timeout)00D1Checksum mismatch in read response00D2Read/Write request/response mismatch
Source: Logix 5000
Open Manual (Page 165)Search more codes in this manual