Technical data

Caution
After COMPRESSING memory in the STOP mode, you can only
restart with a COLD RESTART. The ISTACK and BSTACK are
not updated.
Power down during
compressing
If there is a power down during the compressing function, no further
block is rewritten. If you call the COMPRESS MEMORY function
again following the return of power, the function is continued.
Errors in the block memory The COMPRESS MEMORY function detects the following errors in
the block memory:
•• wrong block length
•• corrupted pattern "7070" in the block header
•• invalid block type (with OBs invalid block number).
The function is then terminated and a message is displayed at the PG.
You must then perform an overall reset. The function can only be
called again following the overall reset.
Note
You cannot use the COMPRESS MEMORY function as long as
the PROGRAM TEST is active.
Transfer block With this function you can transfer new or existing logic and data
blocks to the user memory of the CPU or to the internal DB-RAM of
the CPU.
If a block already exists in the user memory of the CPU, it is declared
invalid and the new block becomes valid. A block will only be
declared invalid when it is not being processed.
PG Functions
CPU 928B Programming Guide
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