Siemens SINUMERIK 840D sl Function Manual page 1320

Detailed description
2.7 Structure and functions of the basic program
2.7 Structure and functions of the basic program
General
The program is modular in design, i.e., it is structured according to NCK functions.
In the operating system, a distinction is made between the following levels of execution:
• Startup and synchronization (OB 100)
• Cyclic mode (OB 1)
• Process interrupt handling (OB 40)
• Diagnostic interrupt, module failure processing (OB 82, OB 86)
Each section of the basic program - as illustrated in the figure below - must be called by the
user in OBs 1, 40 and 100.
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Basic logic functions: PLC basic program solution line (P3 sl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0