Allen-Bradley controllogix 1756-L61, Application Book

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43 Publication LOGIX-AP007B-EN-P - January 2007
Appendix
B
Performance Data
Introduction
This appendix describes performance data of the CompactFlash card. All tests
were done with Rockwell Automation 1784-CF64 Revision BO1 cards.
Performance with third party CompactFlash cards will vary.
Performance Data Tables
The following tables show the performance of the CompactFlash card in
varying instances.
Access 450 Bytes
This table shows the baseline performance of the CompactFlash card. The
application code as it is shipped was used to access 450 bytes. All data shown is
in ms. Each command was performed 32,000 times and the highest value is
shown.
Topic Page
Performance Data Tables 43
Access 450 Bytes 43
Access 4500 Bytes 44
Access 4500 Bytes with an HMI Load 44
Access 4500 Bytes with 16 Message Instructions 44
Access 4500 Bytes and Periodic Tasks 44
TIP
The application described in this document depends on
messaging to perform operations, such as open, read, or
write, on the CompactFlash card.
Therefore, data transfer rates will be affected by the
communications time slice and amount of other messaging
and HMI communications that is occurring in the
controller, as well as program structures, for example,
motion, periodic tasks, and event tasks.
Create Command Write Command Read Command Delete Command
L6X Controllers 67 187 52 82