OverviewΒΆ
AC500 PLCs offer a variety of storage devices. The following table gives a short overview and description about these storage devices:
Note
IEC access means that the storage device can be accessed by Function Blocks of an IEC Program.
FTP access means that the device can be accessed via the FTP server on the PLC (if available).
| Name | Description | IEC Access | FTP Access | CPUs |
|---|---|---|---|---|
| RAMdisk | The system ramdisk is a volatile storage device placed in the SDRAM and used by the firmware during its operation. | No | Yes | All |
| Userdisk | The Userdisk is a volatile storage device placed in the SDRAM and can be used for any application purpose. | Yes | Yes | All |
| SRAMdisk | The SRAMdisk is a battery-buffered, non-volatile ramdisk placed in the SRAM and can be used for any application purpose. | Yes | Yes | PM57x, PM58x, PM59x |
| Flash | The internal flash is the PLCs remanent memory used for storing firmware, user application and user data. | Yes | No | All |
| Flashdisk | The flashdisk is an internal remanent mass storage device and can be used for any application purpose. | Yes | Yes | PM592-ETH PM595-4ETH |
| SD Memory Card | The SD Memory Card is a removable remanent mass storage device and can be used for any application purpose. | Yes | Yes | PM55x, PM56x (with SD Memory Card Slot only) PM57x, PM58x, PM59x |