Plc Program - Siemens SINUMERIK 840D sl Commissioning Manual

Fundamentals

15.4 PLC program

15.4 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:
306
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.
Commissioning Manual, 07/2007, 6FC5397-2AP10-3BA0
IBN CNC: NCK, PLC, drive