6 Assi
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Parameters to the Control and the PLC Pro
ram
6
03.96
6.3 Protection level concept
6-91
 Siemens AG 2000 All Rights Reserved
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
Protection levels 4 to 7 require a particular keyswitch setting on the machine
control panel. Three keys of different colors are provided for this purpose. Each
of these keys is capable of providing access to particular data areas. The asso-
ciated interface signals are located in DB10, DBB56.
Table 6-3 Meaning of keyswitch positions
Key color
Switch position Protection level
All (no key used) 0 = Remove key position 7
Black 0 and 1 6–7
Green 0 to 2 5–7
Red 0 to 3 4–7
The user can change the priority of the protection levels. Only protection levels
of a lower priority may be assigned to machine data. Levels of a lower or higher
priority may be assigned to setting data.
Example:
%_N_UGUD_DEF File for global variables
;$PATH=/_N_DEF_DIR
REDEF $MA_CTRLOUT_SEGMENT_NR APR 2 APW 2
(APR ... read authorization)
REDEF $MA_ENC_SEGMENT_NR APR 2 APW 2
(APW ... write authorization)
REDEF $SN_JOG_CONT_MODE_LEVELTRIGGRD APR 2 APW 2
M30
The file becomes active when the next _N_INITIAL_INI is read in. Different
protection levels are specified for writing (changing) or reading (part program or
PLC).
Example:
MD 10000 is protected by levels 2 / 7, i.e. protection level 2 (password) must be
disabled to write it and protection level 7 to read it. Keyswitch position 3 or
higher is required to reach the machine data area.
Protection levels
4–7
Redefinition of
protection levels
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