Siemens SIMATIC S7-200 User manual

Preface
Installing the hardware 1
Installing the software 2
Basic settings 3
First programming exercise 4
More exercises 5
Appendix A
SIMATIC S7-200
S7-200
Getting Started - Beginners
Training Documents
07/2007
A5E01031470B

Safety Guidelines
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
with a safety alert symbol, indicates that minor personal injury can result if proper precautions are not taken.
CAUTION
without a safety alert symbol, indicates that property damage can result if proper precautions are not taken.
NOTICE
indicates that an unintended result or situation can occur if the corresponding information is not taken into
account.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The device/system may only be set up and used in conjunction with this documentation. Commissioning and
operation of a device/system may only be performed by qualified personnel. Within the context of the safety notes
in this documentation qualified persons are defined as persons who are authorized to commission, ground and
label devices, systems and circuits in accordance with established safety practices and standards.
Prescribed Usage
Note the following:
WARNING
This device 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. Correct, reliable operation of the product requires proper transport, storage,
positioning and assembly as well as careful operation and maintenance.
Trademarks
All names identified by ® are registered trademarks of the Siemens AG. The remaining trademarks in this
publication may be trademarks whose use by third parties for their own purposes could violate the rights of the
owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.
Siemens AG
Automation and Drives
Postfach 48 48
90327 NÜRNBERG
GERMANY
A5E01031470B
Ⓟ 09/2007
Copyright © Siemens AG 2007.
Technical data subject to change

Getting Started - Beginners
Training Documents, 07/2007, A5E01031470B 3
Preface
Dear S7-200 user,
A programmable controller runs a control program that you create to solve most automation
tasks. The S7-200 Micro PLC can help you win the automation race to improve safety,
quality, and production speed while reducing project costs.
The S7-200 Micro PLC is being used for more and more applications because it combines
power with an attractive price and simple operation.
To make your first steps in the world of S7-200 as simple as possible, we have created a
special Starter Kit.
This
Getting Started - Beginners is intended to teach you the basic skills to be able to use
the S7-200 within the shortest possible time.
And now, we wish you a simple and quick start and every success.
*RRGOXFN

Preface
Getting Started - Beginners
4 Training Documents, 07/2007, A5E01031470B
Contents of the S7-200 starter kit
Item Quantity Available
S7-200 CPU 222 AC/DC/RLY 1
Input Simulator for CPU 222 1
Software: STEP 7-Micro/WIN V4 1
Output Simulator on mounting rail 1
PC/PPI Programming Cable (USB/RS 485) 1
S7-200 Documentation 1
Getting Started - Beginners (including CD with programming
exercises)
1
Screwdriver 1
Practice examples for the
Getting Started - Beginners can be found on the STEP 7-
Micro/WIN documentation CD at: \English\Manuals\PrimerEx, or on your Programming
Exercises CD.
Safety guidelines
The Getting Started - Beginners is a quick introduction to the world of S7-200. It is not a
substitute for the
S7-200 Programmable Controller System Manual . Therefore, you should
observe the instructions given in the
S7-200 Programmable Controller System Manual ,
especially the safety guidelines.

Getting Started - Beginners
Training Documents, 07/2007, A5E01031470B 5
Table of contents
Preface................................................................................................................................................... 3
1 Installing the hardware............................................................................................................................ 7
1.1 Assembly and Installation of the Hardware................................................................................. 7
1.2 Details of the S7-200 (CPU 222) ................................................................................................ 8
1.3 Wiring diagrams for the assembled hardware............................................................................. 9
2 Installing the software ........................................................................................................................... 13
2.1 Installing STEP 7-Micro/WIN for Getting Started - Beginners ................................................... 13
2.2 Starting STEP 7-Micro/WIN ...................................................................................................... 14
2.3 Using the Help system.............................................................................................................. 15
3 Basic settings........................................................................................................................................ 17
3.1 Connecting the communication cable ....................................................................................... 17
3.2 Configuring the S7-200 communication.................................................................................... 18
3.3 Performing the first function test ............................................................................................... 19
4 First programming exercise................................................................................................................... 21
4.1 Writing your first program ......................................................................................................... 21
4.2 Opening the first programming exercise ................................................................................... 22
4.3 Downloading the first exercise program to the CPU ................................................................. 23
4.4 Function and Test of the first exercise program........................................................................ 24
4.5 Elements of ladder logic (LAD) ................................................................................................. 25
4.6 Transforming a circuit diagram ................................................................................................. 26
4.7 Elements of the first exercise program...................................................................................... 27
4.8 Status view (online) .................................................................................................................. 28
4.9 Statements ............................................................................................................................... 29
5 More exercises ..................................................................................................................................... 31
5.1 First program modification ........................................................................................................ 31
5.1.1 AND logic operation.................................................................................................................. 31
5.1.2 Inserting a logic gate................................................................................................................. 32
5.1.3 Entering the operand and testing.............................................................................................. 33
5.1.4 Deleting a contact or an operand.............................................................................................. 34
5.2 Second modification to the program .........................................................................................35
5.2.1 OR logic operation.................................................................................................................... 35
5.2.2 Inserting an OR element........................................................................................................... 36
5.3 Third modification to the program ............................................................................................. 37
5.3.1 On-delay timer .......................................................................................................................... 37

Table of contents
Getting Started - Beginners
6 Training Documents, 07/2007, A5E01031470B
5.3.2 Understanding the on-delay timer function ............................................................................... 38
5.3.3 Programming the on-delay timer............................................................................................... 39
5.4 Working with projects................................................................................................................ 40
5.4.1 Programming with symbols....................................................................................................... 40
5.4.2 Creating a new project.............................................................................................................. 42
5.5 Do you want to learn more?...................................................................................................... 45
A Appendix .............................................................................................................................................. 47
A.1 Of bits, bytes and words ... ....................................................................................................... 47
A.2 Address areas of the S7-200 .................................................................................................... 48
A.3 Cyclic program execution in the S7-200 PLC............................................................................ 49

Getting Started - Beginners
Training Documents, 07/2007, A5E01031470B 7
Installing the hardware 1
1.1 Assembly and Installation of the Hardware
Assembly and Installation of the Hardware
1. Attach the enclosed mounting rail on a base plate as shown here.
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3. Attach the assembled S7-200 to the mounting rail.
4. Attach the output simulator to the mounting rail.

Installing the hardware
1.2 Details of the S7-200 (CPU 222)
Getting Started - Beginners
8 Training Documents, 07/2007, A5E01031470B
1.2 Details of the S7-200 (CPU 222)
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Installing the hardware
1.3 Wiring diagrams for the assembled hardware
Getting Started - Beginners
Training Documents, 07/2007, A5E01031470B 9
1.3 Wiring diagrams for the assembled hardware
Wiring diagram for the assembled hardware
Connect the bold wires as shown in the diagram below. The gray wire is only mechanically
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Installing the hardware
1.3 Wiring diagrams for the assembled hardware
Getting Started - Beginners
10 Training Documents, 07/2007, A5E01031470B
Circuit diagram for the assembled hardware
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Installing the hardware
1.3 Wiring diagrams for the assembled hardware
Getting Started - Beginners
Training Documents, 07/2007, A5E01031470B 11
Wiring diagram of the S7-200 (CPU 222 AC/DC/RLY))
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Getting Started - Beginners
Training Documents, 07/2007, A5E01031470B 13
Installing the software 2
2.1 Installing STEP 7-Micro/WIN for Getting Started - Beginners
In order to install the STEP 7-Micro/WIN V4 programming software you need a PC or
programming device (PG) with a Microsoft Operating System. The software will run on
Windows 2000 Service Pack 3 or later, Windows XP Home, or Windows XP Professional.
1. Insert the CD into your PC or PG that has Microsoft Operating System running.
2. Select the installation.
3. Start the installation wizard and follow the instructions.
1.
2.
3.
Note: If you have a previous version of STEP 7-Micro/WIN installed, you will be prompted to
remove the old software and reboot your system. After the old software is removed, open
and close the CD drive to restart the installation process.
At the end of the installation, the entry, "STEP 7-Micro/WIN" appears in the Windows Start
menu, Start > SIMATIC.

Installing the software
2.2 Starting STEP 7-Micro/WIN
Getting Started - Beginners
14 Training Documents, 07/2007, A5E01031470B
2.2 Starting STEP 7-Micro/WIN
From the Windows Start menu, select the SIMATIC > STEP 7-Micro/WIN V4.0.x.xx >
STEP 7-Micro/WIN to start the STEP7-Micro/WIN programming software.

Installing the software
2.3 Using the Help system
Getting Started - Beginners
Training Documents, 07/2007, A5E01031470B 15
2.3 Using the Help system
The Help window tabs, Contents, Index, and Find (full text search) help you find a topic
starting with a view of all Help topics.
Select a menu item, or open a dialog box, for which you want help and press the "F1" key to
access the context-sensitive help for that item.
What's This? Help provides definitions of interface elements. You can also access What's
This? Help by pressing the shift and F1 keys simultaneously. The cursor changes to a
question mark; use it to click on the item for which you want help.
If your computer has access to the Internet you can download or retrieve information about
SIMATIC S7-200 hardware and software using the S7-200 on the Web menu item in the
Help menu.

Getting Started - Beginners
Training Documents, 07/2007, A5E01031470B 17
Basic settings 3
3.1 Connecting the communication cable
The PC/PPI Programming Cable (USB/RS 485) connects a PC to the S7-200 PLC.
On your PC, use a standard Universal Serial Bus (USB) peripheral connector. Connect the
USB/PPI cable to the PC and to the PLC.
Supply the PLC with the operating voltage.
The STOP or RUN LED should be illuminated.
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Basic settings
3.2 Configuring the S7-200 communication
Getting Started - Beginners
18 Training Documents, 07/2007, A5E01031470B
3.2 Configuring the S7-200 communication
1. Click the communications icon in the navigation bar.
2. Review the communications settings.
3. Double-click the corresponding field to refresh. The connected CPU should now be
recognized and registered automatically.
4. If the CPU is not recognized, or if a pop-up window tells you that communication is not
possible, double-click the field PC/PPI cable.
5. Select PC/PPI cable in the Set PG/PC Interface dialog and select Properties.
6. In the PPI tab, set the station address to 0 and set the transmission rate to 9.6 kbps. In
the Local Connection tab, select the USB port. Click OK to confirm all settings and close
the Properties dialog. Click OK to close the Set PG/PC Interface dialog. Note that the
station address cannot be the same number as the CPU address.
7. Double-click the corresponding field in the communications field to refresh. The CPU will
now be recognized and registered automatically. The process could take a few seconds.
Now click OK to close the Communications dialog.
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Basic settings
3.3 Performing the first function test
Getting Started - Beginners
Training Documents, 07/2007, A5E01031470B 19
3.3 Performing the first function test
To perform the first function test, follow the steps below:
1. Set the mode selector of the PLC to the TERM or RUN position. The mode selector is
located behind the small cover at the front side of the CPU.
Note that remote control of the operating mode (RUN or STOP) is possible only in the
TERM or RUN position.
2. From the PC, switch the S7-200 to STOP mode and back to RUN.
The green RUN LED on the PLC lights up in RUN mode. The yellow STOP LED on the
PLC lights up in STOP mode. If you can switch the PLC operating modes from the PC,
the connection between the PC and PLC is configured correctly.
If the mode does not change, check the connecting cable between the PC and PLC and
the communication settings within STEP 7-Micro/WIN.
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