View source for S7-PCI315:Storage Behaviour

The S7-PCI315 has RAM memory to hold and execute the PLC program. The memory contents are buffered with the supplied battery, if the PC is switched off and the external 24V power supply is disconnected. Further, the S7-PCI315 is equipped with internal flash memory, that keeps it's contents, independent from power supply. The internal flash memory holds the PLC program as binary file (S7.bin) and the S7-PCI315 firmware (S7PLC.NXF).
Applying an additional MicroSD card (optional) instead of the internal flash memory permits saving the PLC program on removable media. The firmware is always required from internal flash memory.

The binary file can be read and written from/to the S7-PCI315 Flash memory with the Hilscher cifX Test tool. Access to the SD card with the cifX-Test-Tool is not possible. The binary file from SD card and internal flash memory are compatible.