Siemens SIMATIC STEP 7 V5.2 User manual

Welcome to STEP 7,
Contents
Introduction to STEP 7 1
The SIMATIC Manager 2
Programming with Symbols 3
Creating a Program in OB1 4
Creating a Program with
Function Blocks and Data Blocks 5
Configuring the Central Rack 6
Downloading and Debugging
the Program 7
Programming a Function 8
Programming a
Shared Data Block 9
Programming a Multiple Instance 10
Configuring the Distributed I/O 11
Appendix
Appendix A A
Index
SIMATIC
Working with STEP 7 V5.2
Getting Started
This manual is part of the documentation
package with the order number:
6ES7810-4CA06-8BA0
Edition 12/2002
A5E00171228-01

Copyright © Siemens AG 2002 All rights reserved
The reproduction, transmission or use of this document or its
contents is not permitted without express written authority.
Offenders will be liable for damages. All rights, including rights
created by patent grant or registration of a utility model or design,
are reserved.
Siemens AG
Bereich Automation and Drives
Geschaeftsgebiet Industrial Automation Systems
Postfach 4848, D- 90327 Nuernberg
Disclaimer of Liability
We have checked the contents of this manual for agreement with
the hardware and software described. Since deviations cannot be
precluded entirely, we cannot guarantee full agreement. However,
the data in this manual are reviewed regularly and any necessary
corrections included in subsequent editions. Suggestions for
improvement are welcomed.
©Siemens AG 2002
Technical data subject to change.
Siemens Aktiengesellschaft A5E00171228-01
Safety Guidelines
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connected equipment against damage. These notices are highlighted by the symbols shown below and
graded according to severity by the following texts:
!Danger
indicates that death, severe personal injury or substantial property damage will result if proper
precautions are not taken.
!Warning
indicates that death, severe personal injury or substantial property damage can result if proper
precautions are not taken.
!Caution
indicates that minor personal injury can result if proper precautions are not taken.
Caution
indicates that property damage can result if proper precautions are not taken.
Notice
draws your attention to particularly important information on the product, handling the product, or to a
particular part of the documentation.
Qualified Personnel
Only qualified personnel should be allowed to install and work on this equipment. Qualified persons are
defined as persons who are authorized to commission, to ground and to tag circuits, equipment, and
systems in accordance with established safety practices and standards.
Correct Usage
Note the following:
!Warning
This device and its components may only be used for the applications described in the catalog or the
technical description, and only in connection with devices or components from other manufacturers
which have been approved or recommended by Siemens.
This product can only function correctly and safely if it is transported, stored, set up, and installed
correctly, and operated and maintained as recommended.
Trademarks
SIMATIC®, SIMATIC HMI® and SIMATIC NET® are registered trademarks of SIEMENS AG.
Third parties using for their own purposes any other names in this document which refer to trademarks might
infringe upon the rights of the trademark owners.

STEP 7 Getting Started
A5E00171228-01 iii
Welcome to STEP 7...
...the SIMATIC standard software for creating programmable logic control
programs in Ladder Logic, Function Block Diagram, or Statement List for SIMATIC
S7-300/400 stations.
About This Getting Started Manual
In this manual, you will get to know the basics of SIMATIC STEP 7. We will show
you the most important screen dialog boxes and the procedures to follow using
practical exercises, which are structured so that you can start with almost any
chapter.
Each section is split into two parts: a descriptive part, marked in gray, and a
process-oriented part, marked in green. The instructions start with an arrow in the
green margin and may be spread out over several pages, finishing in a full stop
and a box containing related topics.
Previous experience of working with the mouse, window handling, pull-down
menus, etc. would be useful, and you should preferably be familiar with the basic
principles of programmable logic control.
The STEP 7 training courses provide you with in-depth knowledge above and
beyond the contents of this Getting Started manual, teaching you how entire
automation solutions can be created with STEP 7.
Requirements for Working with the Getting Started Manual
In order to carry out the practical exercises for STEP 7 in this Getting Started
manual, you require the following:
•A Siemens programming device or a PC
•The STEP 7 software package and the authorization diskette
•A SIMATIC S7-300 or S7-400 programmable controller
(for Chapter 7 "Downloading and Debugging the Program").
Additional Documentation on STEP 7
•STEP 7 Basic Information
•STEP 7 Reference Information
After you have installed STEP 7, you will find the electronic manuals in the Start
menu under Simatic > Documentation or alternatively, you can order them from
any Siemens sales center. All of the information in the manuals can be called up
in STEP 7 from the online help.
Have fun and good luck!
SIEMENS AG

Welcome to STEP 7...
STEP 7 Getting Started
iv A5E00171228-01

STEP 7 Getting Started
A5E00171228-01 v
Contents
1 Introduction to STEP 7
1.1
1.2
1.3
1.4
What You Will Learn
Combining Hardware and Software
Basic Procedure Using STEP 7
Installing STEP 7
1-1
1-3
1-4
1-5
2 The SIMATIC Manager
2.1
2.2
Starting the SIMATIC Manager and Creating a Project
The Project Structure in the SIMATIC Manager
and How to Call the Online Help
2-1
2-4
3 Programming with Symbols
3.1
3.2
Absolute Addresses
Symbolic Programming
3-1
3-2
4 Creating a Program in OB1
4.1
4.2
4.3
4.4
Opening the LAD/STL/FBD Program Window
Programming OB1 in Ladder Logic
Programming OB1 in Statement List
Programming OB1 in Function Block Diagram
4-1
4-4
4-8
4-11
5 Creating a Program with Function Blocks and Data Blocks
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
Creating and Opening Function Blocks (FB)
Programming FB1 in Ladder Logic
Programming FB1 in Statement List
Programming FB1 in Function Block Diagram
Generating Instance Data Blocks and Changing Actual Values
Programming a Block Call in Ladder Logic
Programming a Block Call in Statement List
Programming a Block Call in Function Block Diagram
5-1
5-3
5-7
5-10
5-14
5-16
5-19
5-21
In Chapters 3 to 5, you create a
simple program.

Contents
STEP 7 Getting Started
vi A5E00171228-01
6 Configuring the Central Rack
6.1 Configuring Hardware 6-1
7 Downloading and Debugging the Program
7.1
7.2
7.3
7.4
7.5
Establishing an Online Connection
Downloading the Program to the Programmable Controller
Testing the Program with Program Status
Testing the Program with the Variable Table
Evaluating the Diagnostic Buffer
7-1
7-3
7-6
7-8
7-12
8 Programming a Function
8.1
8.2
8.3
Creating and Opening Functions (FC)
Programming Functions
Calling the Function in OB1
8-1
8-3
8-6
9 Programming a Shared Data Block
9.1 Creating and Opening Shared Data Blocks 9-1
10 Programming a Multiple Instance
10.1
10.2
10.3
10.4
Creating and Opening a Higher-Level Function Block
Programming FB10
Generating DB10 and Adapting the Actual Value
Calling FB10 in OB1
10-1
10-3
10-7
10-9
11 Configuring the Distributed I/O
11.1 Configuring the Distributed I/O with PROFIBUS DP 11-1
Appendix A A-1
Overview of the Sample Projects for the Getting Started Manual
Index Index-1
In Chapters 8 to 11, you can
extend your knowledge to include
new functions.
In Chapters 6 and 7, you
configure the hardware and test
your program.

STEP 7 Getting Started 1-1
A5E00171228-01
1 Introduction to STEP 7
1.1 What You Will Learn
Using practical exercises, we will show you how easy it is to program in Ladder
Logic, Statement List, or Function Block Diagram with STEP 7.
Detailed instructions in the individual chapters will show you step-by-step the
many ways in which you can use STEP 7.
Creating a Program with Binary Logic
In Chapters 2 to 7, you will create a program with binary logic. Using the
programmed logic operations, you will address the inputs and outputs of your CPU
(if present).
The programming examples in the Getting Started manual are based, among other
things, on three fundamental binary logic operations.
The first binary logic operation, which you will program later on, is the AND
function. The AND function can be best illustrated in a circuit diagram using two
keys.
The second binary logic operation is the OR function. The OR function can also be
represented in a circuit diagram.
Key 1 Key 2
Key 3
If both Key 1 and Key 2
are pressed, the bulb
lights up.
Key 4 If either key 3 or key 4
is pressed, the bulb
lights up.

Introduction to STEP 7
1-2 STEP 7 Getting Started
A5E00171228-01
The third binary logic operation is the memory element. The SR function reacts
within a circuit diagram to certain voltage states and passes these on accordingly.
Memory Element
S
R
Key S
Key R
If key S is pressed, the bulb lights up
and remains lit until key R is pressed.

Introduction to STEP 7
1-3
STEP 7 Getting Started
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1.2 Combining Hardware and Software
Using the STEP 7 software, you can create your S7 program within a project. The
S7 programmable controller consists of a power supply unit, a CPU, and input and
output modules (I/O modules).
The programmable logic controller (PLC) monitors and controls your machine with
the S7 program. The I/O modules are addressed in the S7 program via the
addresses.
Transferring a program
STEP 7 software
Machine to be
controlled
Input module
CPU
Power supply module
Output module
Programming
device cable Programming device

Introduction to STEP 7
1-4 STEP 7 Getting Started
A5E00171228-01
1.3 Basic Procedure Using STEP 7
Before you create a project, you should know that STEP 7 projects can be created
in different orders.
Option 2Option 1
If
y
ou are creatin
g
comprehensive pro
g
rams with man
y
inputs and outputs, we
recommend
y
ou confi
g
ure the hardware first. The advanta
g
e of this is that STEP 7
displa
y
s the possible addresses in the Hardware Confi
g
uration Editor.
If you choose the second option, you have to determine each address yourself, depending
on your selected components and you cannot call these addresses via STEP 7.
In the hardware configuration, not only can you define addresses, but you can also change
the parameters and properties of modules. If you want to operate several CPUs, for
example, you have to match up the MPI addresses of the CPUs.
Since we are only using a small number of inputs and
outputs in the Getting Started manual, we will skip the
hardware configuration for now and start with the
programming.
Configuring the hardware
(Chapter 6) Creating a program
(Chapters 3 to 5)
Creating a program
(Chapters 3 to 5) Configuring the hardware (Chapter 6)
Transferring the program to the CPU and debugging
(Chapter 7)
Designing the solution to the automation task
Creating a project (Chapter 2)

Introduction to STEP 7
1-5
STEP 7 Getting Started
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1.4 Installing STEP 7
Regardless of whether you want to start with programming or configuring
hardware, you first have to install STEP 7. If you are using a SIMATIC
programming device, STEP 7 is already installed.
When installing the STEP 7 software
on a programming device or PC
without a previously installed version of
STEP 7, note the software and
hardware requirements. You can find
these in the Readme.wri on the
STEP 7 CD under
<Drive>:\STEP 7 \Disk1.
If you need to install STEP 7 first,
insert the STEP 7 CD in the CD-ROM
drive now. The installation program
starts automatically. Follow the
instructions on the screen.
Once the installation is complete and
you have restarted the computer, the
"SIMATIC Manager" icon will appear
on your Windows desktop.
If you double-click the "SIMATIC Manager" icon following installation, the STEP 7 Wizard
will be started automaticall
y
.
You can find additional notes on installation in the
Readme.wri file on the STEP 7 CD under
<Drive>:\STEP 7 \Disk1\Readme.wri.
If the installation does not start auto-
matically, you can also find the
installation program on the CD
-ROM
under
<Drive>:\STEP 7 \Disk1\setup.exe.

Introduction to STEP 7
1-6 STEP 7 Getting Started
A5E00171228-01

STEP 7 Getting Started 2-1
A5E00171228-01
2 The SIMATIC Manager
2.1 Starting the SIMATIC Manager and Creating a Project
The SIMATIC Manager is the central window which becomes active when STEP 7
is started. The default setting starts the STEP 7 Wizard, which supports you when
creating a STEP 7 project. The project structure is used to store and arrange all
the data and programs in order.
Double-click the SIMATIC Manager
icon on the Windows desktop, then
select the File > Wizard "New
Project" menu command if the wizard
does not start automatically.
In the preview, you can toggle the
view of the project structure being
created on and off.
To move to the next dialog box, click
Next.
Within the project, data are stored in the
form of objects in a hierarchical structure
The SIMATIC station and the CPU
contain the configuration and
parameter data of the hardware
The S7 program comprises all the
blocks with the programs necessary for
controlling the machine

The SIMATIC Manager
2-2 STEP 7 Getting Started
A5E00171228-01
For the "Getting Started" sample
project, select CPU 314. The example
has been created in such a way that
you can actually select the CPU you
have been supplied with at any time.
The default setting for the MPI address
is 2.
Click Next to confirm the settings and
move to the next dialog box.
Select the organization block OB1 (if
this is not already selected).
Select one of the programming
languages: Ladder Logic (LAD),
Statement List (STL), or Function
Block Diagram (FBD).
Confirm your settings with Next.
Every CPU has certain
properties; for example,
regarding its memory
configuration or address
areas. This is why you have
to select the CPU before you
start programming.
The MPI address (multipoint
interface) is required in order
for your CPU to communicate
with your programming device
or PC.
OB1 represents the highest
programming level and organizes the
other blocks in the S7 program.
You can change the programming
language again at a later date.

The SIMATIC Manager
2-3
STEP 7 Getting Started
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Double-click to select the suggested
name in the "Project name" field and
overwrite it with "Getting Started."
Click Make to generate your new
project according to the preview.
When you click the Make button, the SIMATIC Manager will open with the window for the
"Getting Started" project you have created. On the following pages, we will show you what
the created files and folders are for and how you can work effectively with them.
The STEP 7 Wizard is activated each time the program is started. You can deactivate this
default setting in the first dialog box for the Wizard. However, if you create projects without
the STEP 7 Wizard, you must create each directory within the project yourself.
You can find more information under
Help > Contents in the topic "Setting
Up and Editing the Project."

The SIMATIC Manager
2-4 STEP 7 Getting Started
A5E00171228-01
2.2 The Project Structure in the SIMATIC Manager and How
to Call the Online Help
As soon as the STEP 7 Wizard is closed, the SIMATIC Manager appears with the
open project window "Getting Started." From here, you can start all the STEP 7
functions and windows.
Downloading the program
and monitoring the
hardware
Opening, organizing, and printing
projects
Calling the STEP 7 online help
Setting the window display and
arrangement, selecting the
language, and making settings for
process data
Editing blocks and inserting program
components
The contents of the right-hand pane
show the objects and other folders
for the folder selected on the left
The contents of the left-hand pane
show the project structure

The SIMATIC Manager
2-5
STEP 7 Getting Started
A
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Calling the Help on STEP 7
F1 Option 1:
Place the cursor on any menu
command and press the F1 key. The
context-sensitive help for the selected
menu command will appear.
Option 2:
Use the menu to open the STEP 7
online help.
The contents page with various help
topics appears in the left-hand pane
and the selected topic is displayed in
the right-hand pane.
Navigate to the topic you want by
clicking the +sign in the Contents list.
At the same time, the contents of the
selected topic are displayed in the
right-hand pane.
Using Index and Find, you can enter
search strings and look for the specific
topics you require.
Option 3:
Click on the "Start page" icon in the
STEP 7 Online Help to open the
information portal. This portal provides
compact access to major topics of the
Online Help, e.g.:
•Getting Started with STEP 7
•Configuring & Programming
•Testing & Debugging
•SIMATIC on the Internet
Option 4:
Click on the question mark button in
the toolbar to turn your mouse into a
help cursor. The next time you click on
a specific object, the online help is
activated.

The SIMATIC Manager
2-6 STEP 7 Getting Started
A5E00171228-01
Navigating in the Project Structure
The project you have just created is
displayed with the selected S7 station
and CPU.
Click the +or –sign to open or close a
folder.
You can start other functions later on
by clicking the symbols displayed in
the right-hand pane.
Click the S7 Program (1) folder. This
contains all the necessary program
components.
You will use the Symbols component
in Chapter 3 to give the addresses
symbolic names.
The Source Files component is used to
store source file programs. These are
not dealt with in the Getting Started
manual.
Click the Blocks folder. This contains
the OB1 you have already created
and, later on, all the other blocks.
From here, you will start programming
in Ladder Logic, Statement List, or
Function Block Diagram in Chapters 4
and 5.
Click the SIMATIC 300 Station folder.
All the hardware-related project data
are stored here.
You will use the Hardware component
in Chapter 6 to specify the parameters
of your programmable controller.
If you require further SIMATIC software for your automation task; for example, the optional
packages PLCSIM (hardware simulation program) or S7 Graph (graphic programming
language), these are also integrated in STEP 7. Using the SIMATIC Manager, for example,
you can directly open the relevant objects such as an S7 Graph function block.
You can find more information under Help >
Contents
in the topics "Working
Out the Automation Concept" and "Basics of Designing the Program Structure".
You can find more information on optional packages in the SIMATIC catalog
ST 70, "Components for Completely Integrated Automation."

STEP 7 Getting Started
A5E00171228-01 3-1
3 Programming with Symbols
3.1 Absolute Addresses
Every input and output has an absolute address predefined by the hardware
configuration. This address is specified directly; that is, absolutely.
The absolute address can be replaced by any symbolic name you choose.
SF
BATF
DC 5V
FRCE
RUN
RUN P
RUN
STOP
M RES
STOP
ON
OFF
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
L+
L+
MM
M
N
L+ L+
M
Digital input
module
Byte 1
Bits 0 to 7
Digital input
module
Byte 0
Bits 0 to 7
Digital output
module
Byte 4
Bits 0 to 7
Digital output
module
Byte 5
Bits 0 to 7
Bit 5
Absolute address: I 1.5
Byte 1
You should only use absolute programming if you do not
have to address many inputs and outputs in your S7
program.
Input

Programming with Symbols
3-2 STEP 7 Getting Started
A5E00171228-01
3.2 Symbolic Programming
In the symbol table, you assign a symbolic name and the data type to all the
absolute addresses which you will address later on in your program; for example,
for input I 0.1 the symbolic name Key 1. These names apply to all parts of the
program and are known as global variables.
Using symbolic programming, you can considerably improve the legibility of the
S7 program you have created.
Working with the Symbol Editor
Navigate in the project window
"Getting Started" until you reach
S7 Program (1) and double-click to
open the Symbols component.
Your symbol table currently only
consists of the predefined organization
block OB1.
Click Cycle Execution and overwrite it
with "Main Program" for our example.
Enter "Green Light" and "Q 4.0" in
row 2. The data type is added
automatically.
Click in the comment column of row 1
or 2 to enter a comment on the
symbol. You complete your entries in a
row by pressing Enter, which then
adds a new row.
Enter "Red Light" and "Q 4.1" in row 3
and press Enter to complete the entry.
In this way, you can assign symbolic names to all
the absolute addresses of the inputs and outputs
which your program requires.