Allen-Bradley controllogix 1756-L61, Application Book

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Publication LOGIX-AP007B-EN-P - January 2007
8 CompactFlash Card Enhancements Overview
Sample File Compatibility
This document is compatible with the sample projects, version 3.2, dated
January 2007.
•
CF_Read_Write_V3_2.ACD
•
CF_Read_Write_V3_2_Example.ACD
CompactFlash File System
Features
The file system has the ability to perform a variety of operations to read or
write data to the CompactFlash card. The following are the basic operations:
•
Create a file
•
Write to a file
•
Read from a file
•
Delete a file
There is an additional command, verification if a CompactFlash card is
present, but as a user you will not access this, this runs as a background check.
For each of the basic operations of the file system, there are related
functionality.
•
Open a file
•
Close a file
•
Set the file pointer
•
Calculate file checksums
•
Verify file checksums
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Data parsing
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Error handling
The application code is set up to handle a file up to 4500 bytes in size.
For more information on how to increase file size, refer to Appendix D,
Expand the Code to Support More than 4500 Bytes of Data.