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01/2008 Machine operating area
4.1 CNC data structure
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© Siemens AG 2008 All rights reserved.
SINUMERIK 840Di sl/840D sl/840D Operating Manual HMI-Advanced (BAD) - 01/2008 Edition 4-85
4.1 CNC data structure
Function
Environment
The following components exist:
• NC with part program memory
• HMI with hard disk
HMI
Use the "Load" - "Unload" softkeys to transfer the data to the NC or
from the NC to the hard disk.
Hard disk HMI
Edit
Edit
Edit
Load
Unload
Save
Tool offset TOA
Zero offset ZOA
R parameters
GUD
Program memory
Parts programs
Sub routines
Workpieces
Channel 1
...
Channel n
RS-232 IFC
Axes
Axes
Display data
NC
Data in the NC memory are retained when the control power supply is
switched off. Only one copy exists of programs that are loaded from
the hard disk to the NC memory. The program memory in the NC is
limited (see Chapter 9.3 under “NC memory”).