Siemens SIMATIC S7-1200 System Manual page 1577

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If you have already performed the device exchange, you must remove the 100-byte reserve

from each block individually:

1. From the project tree, right-click a data block from the Program blocks folder and select

Properties from the shortcut menu.

2. In the Data block properties dialog, select the "Download without reinitialization" node.

3. Set the memory reserve to 0 bytes.

4. Repeat for each data block in your project.

Projects for V4.0 and V4.1 CPUs can run without modification in V4.2 CPUs.

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

Device exchange and spare parts compatibility

D.2 S7-1200 V3.0 and earlier terminal block spare kits