Siemens Memory Specifications download pdf (Page 6)

2 S7-1200/1500 Innovations

2.1 Introduction

Programming Guideline for S7-1200/1500

V1.2, Entry ID: 81318674

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2 S7-1200/1500 Innovations

2.1 Introduction

In general, the programming of SIMATIC controllers has stayed the same from S7-

300/400 to S7-1500. There are the familiar programming languages such as LAD,

FBD, STL, SCL or graph and blocks such as organization blocks (OBs), function

blocks (FBs), functions (FCs) or data blocks (DBs). I.e. already created S7-300/400

programs can be implemented on S7-1500 and already created LAD, FBD and

SCL programs on S7-1200 controller without any problems.

Additionally, there are many innovations that make programming easier for you and

which allow a powerful and storage-saving code.

We not only recommend implementing programs that are implemented for S7-

1200/1500 controllers 1:1 but also to check them for the new options and where

applicable, to use them. The additional effort is often limited and you get a program

code that is, for example,

• optimal in terms of memory and runtime for the newer CPUs

• easier to understand,

• and easier to maintain.

2.2 Terms

General terms using TIA Portal

Some terms have changed in order to make better handling with the TIA Portal

possible.

Figure 2-1: New terms in the TIA Portal

Symbol table

PLC tags

STEP 7 V5.x STEP 7 (TIA Portal)

VAT table Watch table

UDT PLC data types

Terms for tags and parameters

When it is about tags, functions, and function blocks, many terms are repeatedly

used differently or even incorrectly. The following figure is to clarify these terms.

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Siemens Memory Specifications Page 6