Commissioning Manual
128 6FC5397-4EP10-0BA8, 07/2018
Commissioning the PLC
6.1
PLC programming conventions
Program organization
During the PLC programming, you must structure your program into finished program parts (subroutines). The programming
language for the S7-200 offers you the capability to set up your user program in a structured manner.
There are the following two types of programs:
● Main program
● Subroutine
Eight levels of programming are possible.
Signal overview of PLC interface
The PLC program exchanges information among the NCK, HMI, MCP, and I/O through the signals of the PLC interface and
signals of the input and output cards.
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