Valid result codes
Value Explanations
0000H No error
4x01H The maximum number of delete attempts has been exceeded. The counter can only be
reset with a cold restart.
4x02H Illegal password (0000H or 3FFFH)
4x04H You have attempted to specify a new password while the password protection was active (x
= number of attempts to delete)
4x08H You attempted to delete the existing password (deactivate protection) with an incorrect
password. The error counter for incorrect attempts was incremented. The counter
reading x is transferred in the result code (binary number in bits no. 8 to 10).
4010H You attempted to delete a non-existent password.
The best time to activate
software protection
The most effective protection is achieved when you activate the
software protection in OB 38/OB 39 (SOFT STOP mode). Protection
is then active immediately following an overall reset even with the
memory card inserted.
Reactions to violations of the
software protection
Once the software protection is active, the system program reacts to
violations of the protection by PG jobs. The following table lists the
reactions to various PG jobs.
PG function Output on PG
Delete block Message "Block type and number illegal"
Read block Output of a dummy block:
FB/FX:
FB number
NAME :DUMMY
:BE
DB/DX: DW0 6500
OB/PB/SB:
:BE
Overwrite block
(block does not yet exist)
The block is entered
Overwrite block
(block already exists)
Message "Block exists"; after confirming with the enter key
the message "Block type and number wrong" is displayed.
Bit Assignment of the System Data Words
CPU 948 Programming Guide
8 - 38 C79000-G8576-C848-04
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