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35Publication LOGIX-AP008B-EN-P - June 2008 35

Chapter

Logix Features that May Not be Familiar to S7

Users

Introduction

This chapter describes Logix features that may not be familiar to S7 users.

Certain features of the Logix system are easier to use and maintain than S7 –

for instance, data is organized into tag databases with no absolute addresses,

whereas in S7 data items have absolute addresses that are selected by the

programmer in defined memory areas.

In other respects, the structure of Logix is quite similar to S7, but it is

presented differently – for instance beneath the surface the Task structure is

similar to S7's Organization Blocks.

Topic Page

S7 Organization Blocks Compared to Logix Tasks 36

Tags Not Addresses 47

I/O and Alias Tags 51

Programming Languages 53

Add-On Instructions 57

The Common Industrial Protocol (CIP) 58

Data Exchange between Controllers 60

User-Defined Data Types 61

Asynchronous I/O Updating 62

The DINT Data Type 62

Phase Manager 63

Coordinated System Time (CST) 65

Timestamped Inputs 65

Scheduled Outputs 65

No Temporary Variables 66

No Accumulators or Special Registers needed 66

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Siemens 7 Bedienungsanleitung Seite 35