MAINTAINING THE CONTROLLER
SNAP PAC S-Series User’s Guide
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To update firmware on the controller. The card provides a convenient way to update firmware
on non-networked controllers. It’s also useful if PAC Manager is not available to update
firmware.
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To boot the controller from firmware on the microSD card rather than from the firmware in the
controller, for example to test new firmware.
•
To update, run, or test new PAC Control strategies if the controller is not on the network, if PAC
Control isn’t available, or if you want to test a new strategy without erasing the existing one.
Card Type and Format
Use only cards with the microSD logo (shown above right) with 2 GB or smaller capacity. Cards come
properly formatted with FAT16 from the factory. If you ever need to reformat a card, make sure to use
a utility specifically designed to format SD cards, and use FAT16.
Since long filenames are not supported, all files you store on the card must be named with a
maximum of eight characters in the name plus three characters in the extension (8 dot 3 format), for
example:
datafile.txt
Storing and Accessing Data or Files
When inserted into the controller and accessed via FTP or PAC Control, the card appears as a
directory in the controller’s file system named:
sdcard0
IMPORTANT:
Do NOT create this directory. When you look at the card in the controller, the directory
automatically appears. When you look at the card in a card reader attached to your PC, the directory does
not appear, but it is still there.
For example, suppose you are looking at a microSD card in a SNAP PAC controller with IP address
10.192.54.241. You can see that this controller has three files in its regular file system, plus the
microSD card:
microSD card
Files in PAC’s file system
