Detailed description
2.7 Structure and functions of the basic program
Basic logic functions: PLC basic program solution line (P3 sl)
46 Function Manual, 11/2006, 6FC5397-0BP10-2BA0
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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