F011

Data Type Mismatch

Allen-Bradley · Logix and SLC PLC

What does F011 mean?

This error occurs when the data type requested by an operation does not match the actual data type available at the specified memory location. This leads to an inability to correctly interpret or process the data.

Common Causes

  • Attempting to read a floating-point value as an integer.
  • Incorrect tag declaration for a data point.
  • Communication protocol expecting a different data format.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Connect to the PLC via the programming software and identify the specific instruction or routine that generates the F011 Data Type Mismatch error.

  2. 2

    Inspect the data type definitions of all tags referenced within the identified instruction or routine, verifying they align with the expected data types.

  3. 3

    Cross-reference all usages of the involved tags throughout the PLC program to ensure consistent data type handling across all operations.

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Verified technical data. Last updated: March 2026

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Source: Allen-Bradley Logix and SLC PLC