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File names in the PAC"Programmable Automation Controller" PAC is a compact controller that combines the features and capabilities of a PC-based control system with that of a typical programmable logic controller (PLC). A PAC thus provides not only the reliability of a PLC, but also the task flexibility and computing power of a PC. Additionally, because they function and communicate over popular network interface protocols, PACs are able to transfer data from the machines they control to other machines and components in a networked control system flash storage are case-insensitive. File names in the PDMM or PCMM flash storage are case-sensitive and the SD card (FAT16 or FAT32) are not case-sensitive.
| Storage | File System | Case-Sensitive |
|---|---|---|
| PAC compact flash | NTFS | No |
| PDMM / PCMM embedded flash | FFS3 (POSIX-like) | Yes |
| PDMM / PCMM SD card | FAT16 or FAT32 | No |
For example, two files (MyFile.txt and myfile.txt) can exist in the same directory of the PDMM flash, but cannot exist in the same directory on a PAC or the PDMM’s SD card. If you copy two files (via backup operation or function) with the same name, but different upper/lower case letters, from the PDMM flash to the SD card, one of the files will be lost. To prevent conflicts and to keep your application compatible across all platforms, use unique filenames and do not rely on case-sensitive filenames.
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