Siemens SINUMERIK 840Di Function Manual page 1230

Detailed Description
2.7 Structure and functions of the basic program
• Process interrupt handling (OB 40)
• Diagnostic interrupt, module failure (OB82, OB86)
Each section of the basic program - as illustrated in the figure below - must be called by the
user in OBs 1, 40 and 100.
Fig. 2-12
2-36
Structure of the basic program
PLC Basic Program Solution Line (P3 sl)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0