Figure 2-11
Interface to and from machine control panel
2.7
Structure and functions of the basic program
2.7.1
General
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)
Each section of the basic program - as illustrated in the figure below - must be called by the
user in OBs 1, 40 and 100.
Basic logic functions: PLC Basic program powerline (P3 pl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
2.7 Structure and functions of the basic program
Detailed description
49