Siemens Simatic S7-300 Specifications download pdf (Page 51)

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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x

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When data are compressed, gaps which have developed between memory objects

in load memory/work memory as a result of load/delete operations will be

eliminated. thus reorganizing free memory area in a continuous block.

Data can be compressed while the CPU is in STOP or RUN mode.

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When copying the RAM content to ROM, the actual values of the DBs are

transferred from RAM to load memory to form the start values for the DBs.

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This function is only permitted when the CPU is in STOP mode.

There will subsequently be no data in load memory if this operation is interrupted

by power failure.

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After the insertion/removal of a Micro Memory Card, a CPU memory reset

establishes defined conditions for CPU restart (warm start).

Memory reset rebuilds the CPU's memory management. Blocks in load memory

are retentive. All runtime-related blocks are transferred again from load memory to

RAM. The effect of this operation, in particular, is to initialize the data blocks in

RAM (i.e. resets them to their initial values).

Memory reset and the corresponding peculiarities are described in the S7-300

Installation Manual, Chapter &380HPRU\5HVHW.

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• All retentive DBs maintain their actual values (non-retentive DBs are also

supported with CPU 317-2 DP). Non-retentive DBs get back their start values).

• The values of all retentive M, C, T are maintained.

• All non-retentive user data is initialized:

– M, C, T, I, O with "0"

• All tasks are initialized.

• The process images are deleted.

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Siemens Simatic S7-300 Specifications Page 51