Siemens SIMATIC S7-300 Manual page 66

Memory concept
6.6 Memory of the integrated technology of the CPU
Reference
More detailed information on determining the actual memory assignment in the integrated
technology can be found in the
Retentive address areas of the memory of the CPU integrated technology
The values for the absolute encoder calibration are stored in a non-volatile memory in the
integrated technology of the CPU.
With the technology function "MC_ReadSysParameter", you can read out the absolute
encoder calibration values and store them retentively in a data block in the load memory on
the MMC. If a CPU is replaced, you can write these stored values back to the integrated
technology via the FB "MC_WriteParameter".
Address areas of the memory of the CPU integrated technology
I/O image (DRIVE)
Part of the address areas of the DP (DRIVE) is listed in the integrated technology as I/O
image DP (DRIVE). You can read this area in the user program with the technology function
"MC_ReadPeriphery" and write with the technology function "MC_WritePeriphery".
The update of the I/O image DP (DRIVE) is described in the
technology functions "MC_ReadPeriphery" and "MC_WritePeriphery".
6-20
S7-Technology
manual.
S7-Technology
manual at the
S7-300 CPU Data: CPU 315T-2 DP
Manual, 12/2005, A5E00427933-02