OPTO 22 SNAP PAC S Series, User Manual, Page: 52 / 70

MAINTAINING THE CONTROLLER
SNAP PAC S-Series User’s Guide 46
Storing and Accessing Data or Files
When inserted into the controller and accessed from a PC using FTP or PAC Control, the card appears as a
directory in the controller’s file system named:
sdcard0
Just like a PC might show a thumb drive as a
directory named Removable Disk (E:), for example, the controller shows the card as a directory named
sdcard0.
IMPORTANT:
Do NOT try to create this directory. When you look at the card in the controller, the card appears as
a directory named sdcard0. When you look at the card in a card reader attached to your PC, you see the card reader’s
directory instead. When the card is in a card reader, you are already in the root of the card (that is, you are already
inside the sdcard0 directory).
For example, suppose you are looking at a 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 card:
Within the
sdcard0
directory on the controller (or the root if the card is in a card reader), you can create
other directories and create or add files. For a card formatted with FAT16, you can have up to 512 files or
directories in the root directory, and each subdirectory can have up to 65,534 files. Cards formatted with FAT32
have no restrictions on the number of files in the root. Note filename requirements in
“Card Type and Format”
on page 44 .
Update non-net-
worked controller
with new strategy
4
In advance
PC with card
reader
Use PAC Control to make controller download
(.cdf) file; then use Windows Explorer to copy
.cdf file to the card.
54
To use Controller
Insert card into controller and cycle power. Con-
troller runs new strategy from card until reset.
Use controller’s Reset button to save strategy to
flash memory.
2, 3
1 Controller must be on same network segment as PC.
2 CAUTION: Before resetting, make sure you know what is on the card! ALL IP address and configuration
information, firmware, and strategy that exist on the card are saved to flash memory.
3 If you have firmware R9.x but a loader older than 6.x, the controller runs the new strategy from card until
reset, but the strategy cannot be saved to flash memory.
4 CAUTION: Persistent variables will be deleted.
To do this When Put card in... Use this method See pg
microSD/SDHC card Files in PAC’s file system