Siemens SINUMERIK 840D sl Function Manual page 43

• Reading in part program
Program code (extract)
. . .
PLCDATA = $A_DBW[4];
. . .
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
Basic logic functions: Various NC/PLC interface signals and functions (A2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Comment
// Read a word
Detailed description
2.2 Functions
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