Detailed Description
2.2 Functions
Various NC/PLC Interface Signals and Functions (A2)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
2-31
• Reading in part program
Program code (extract) Comment
. . .
PLCDATA = $A_DBW[4]; // Read a word
. . .
Behavior during POWER ON, block search
The DPR communications buffer is initialized during "POWER ON".
During a "block search", the PLC variable outputs are collected and transferred to the DPR
communications buffer with the approach block (analogous to writing of analog and digital
outputs).
Other status transitions have no effect in this respect.
2.2.5 Access protection via password and keyswitch
2.2.5.1 Access protection via password and keyswitch
Access authorization
Access to functions, programs and data is useroriented and controlled via 8 hierarchical
protection levels. These are subdivided into:
• Password levels for Siemens, machine manufacturer and end user
• Keyswitch positions for end user
Multi-level security concept
A multi-level security concept to regulate access rights is available in the form of password
levels and keyswitch settings.
Protection
level
Type Users Access to (examples)
0 Password Siemens All functions, programs and data
1 Password Machine manufacturer:
Development
Defined functions, programs and data;
e.g.,: entering options
2 Password Machine manufacturer:
Start-up engineer
Defined functions, programs and data;
e.g.,: Bulk of machine data
3 Password End user:
Servicing
Assigned functions, programs and data
4 Keyswitch position 3 End user: Programmer,
machine setter
Lower than protection level
0 to 3; defined by machine manufacturer or end user
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