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19.4 Deleting on the Programmable Controller
Programming with STEP 7
Manual, 05/2010, A5E02789666-01 437
19.4.2 Deleting S7 Blocks on the Programmable Controller
Deleting individual blocks on the CPU may be necessary during the test phase of the CPU
program. Blocks are stored in the user memory of the CPU either in the EPROM or RAM
(depending on the CPU and the load procedure).
• Blocks in the RAM can be deleted directly. The occupied space in the load or work memory
becomes free and can be used again.
• Blocks in the integrated EPROM are always copied to the RAM area following a memory reset
of the CPU. The copies in the RAM can be deleted directly. The deleted blocks are then
marked in the EPROM as invalid until the next memory reset or power down without RAM
backup. Following a memory reset or power down without RAM backup, the "deleted" blocks
are copied from the EPROM to the RAM and become active. Blocks in the integrated EPROM
(for example, in the CPU 312) are deleted by overwriting them with the new RAM contents.
• EPROM memory cards must be erased in the programming device.