File Log

R2026b

Write signal data file log on target computer

• 

File Log block

To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.

Libraries:
Simulink Real-Time / Logging

Description

The File Log block logs the signal at its input port to the Speedgoat^® target computer file system when you enable logging service.

For more information about the file logging workflow, see Real-Time Signal Logging and Streaming Basics.

Examples

Real-Time Signal Logging and Parameter Tuning

Use real-time parameter tuning and data logging with Simulink® Real-Time™.

• Open Script

Tune Decimation for File Log Data Without Model Rebuild

Use tunable decimation for data logging.

• Open Script

Limitations

The File Log block uses discrete sample time. When logging signal data for continuous signals, File Log data may differ slightly from signal data produced by marking the signal for logging in the Simulation Data Inspector. For more information, see Types of Sample Time.

Ports

Input

S — Signal data for file log

scalar | vector | matrix | array | bus | nonvirtual bus

Provides the signal data input for the file log.

Parameters

Decimation — Applies decimation to file log data

1 (default) | integer

The decimation parameter value selects decimation for the samples captured in the file log.

By using the File Log decimation functions, subsequent loads of the real-time application MLDATX file run on the target with the modified decimation value of the File Log block. These functions are:

• getAllFileLogBlocks

• getFileLogDecimation

• setFileLogDecimation

For more information, see Tune Decimation for File Log Data Without Model Rebuild.

Programmatic Use

decimation

Input Processing — Selects processing mode for file log data

Elements as channels (sample based) (default) | Columns as channels (frame based)

The input processing parameter value selects whether the logged signal data is processed and sent to the Simulation Data Inspector in sample or frame processing mode. For more information about sample-based data and frame-based data in the Simulation Data Inspector, see View Simulation Data in Simulation Data Inspector.

Programmatic Use

inputProcessing

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"slrealtimeloglib/File Log"

Example: add_block("slrealtimeloglib/File Log","myModel/myBlock",MakeNameUnique="on")

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2020b

R2026a: Apache Parquet log file format

The File Log logging format is changed to Apache Parquet format, which supports efficient data storage and retrieval.

R2022a: Decimation, Log Retention, and Frame-Based Input

Functions let you get and set decimation values for File Log blocks in a model. Also, functions let you control when File Log recording starts and stops.