Specifications

4-1

S7-200 Programmable Controller System Manual

C79000-G7076-C233-01

Basic Concepts for Programming an

S7-200 CPU

Before you start to program your application using the S7-200 CPU, you should

become familiar with some of the basic operational features of the CPU.

Chapter Overview

Section Description Page

4.1 Guidelines for Designing a Micro PLC System 4-2

4.2 Concepts of an S7-200 Program 4-5

4.3 Concepts of the S7-200 Programming Languages and Editors 4-6

4.4 Understanding the Differences between SIMATIC and

IEC 1131-3 Instructions

4-10

4.5 Basic Elements for Constructing a Program 4-18

4.6 Understanding the Scan Cycle of the CPU 4-22

4.7 Selecting the Mode of Operation for the CPU 4-25

4.8 Creating a Password for the CPU 4-27

4.9 Debugging and Monitoring Your Program 4-30

4.10 Error Handling for the S7-200 CPU 4-36