Plc Program - Siemens SINUMERIK 804D sl Commissioning Manual

Fundamentals

15.5 PLC program

15.5 PLC program
Introduction
The PLC program is constructed modularly. It comprises the two parts:
• PLC basic program
• PLC user program
PLC basic program
For a complete description of the basic PLC program, its structure and all modules including
their call parameters, please refer to:
Literature
Function Manual Basic Functions; Basic PLC Program
PLC user program
The organization blocks of the basic machine contain the entry points for the appropriate
parts of the PLC user program.
• OB100 (cold restart)
• OB1 (cyclic processing)
• OB40 (process alarm)
The following diagram shows the structure of the PLC program:
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The PLC basic program organizes the exchange of signals and data between the PLC
user program and the NCK, HMI, and machine control panel components. The PLC basic
program is a part of the tool box delivered with the SINUMERIK 840D sl.
The PLC user program is the user-specific part of the PLC program by which the basic
PLC program has been added to or extended.
CNC Part 1 (NCK, PLC, drive)
Commissioning Manual, 11/2006, 6FC5397-2AP10-2BA0