Siemens SIMATIC S7-1200 Easy Book User manual

Preface
Introducing the flexible and
powerful S7-1200
1
STEP 7 Basic makes the
work easy
2
Getting started
3
How the S7-1200 works
4
Programming options
5
Communications
6
Using the pulse generators
of the S7-1200
7
Online functionality
8
Technical specifications
A
SIMATIC
S7-1200
Easy Book
Manual
05/2009
A5E02486774-01

Legal information
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without a safety alert symbol, indicates that property damage can result if proper precautions are not taken.
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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.
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Note the following:
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Siemens products may only be used for the applications described in the catalog and in the relevant technical
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We have reviewed the contents of this publication to ensure consistency with the hardware and software
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Siemens AG
Industry Sector
Postfach 48 48
90026 NÜRNBERG
GERMANY
Ordernumber: 6ES7 298-8FA30-8BQ0
Ⓟ 06/2009
Copyright © Siemens AG 2009.
Technical data subject to change

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Manual, 05/2009, A5E02486774-01 3
Preface
Welcome to the world of S7-1200, the latest in a line of the Siemens SIMATIC controllers.
The SIMATIC S7-1200 compact controller is the modular, space-saving controller for small
automation systems that require either simple or advanced functionality for logic, HMI and
networking. The compact design, low cost, and powerful features make the S7-1200 a
perfect solution for controlling small applications.
As part of the SIMATIC commitment to "totally integrated automation" (TIA), the S7-1200
product family and the STEP 7 Basic programming tool give you the flexibility you need to
solve your automation needs.
The S7-1200 helps to make the most challenging tasks easy!
The SIMATIC S7-1200 controller solution, designed for the "compact" controller class, is
comprised of the SIMATIC S7-1200 controller and SIMATIC HMI Basic panels that can both
be programmed with SIMATIC STEP 7 Basic engineering software. The ability to program
both devices using the same engineering software significantly reduces development costs.
The S7-1200 compact controller includes:
•Built-in PROFINET, high speed motion control I/O,
onboard analog inputs to minimize space
requirements and the need for additional I/O.
•CPUs available with built-in I/O from 10-I/O to 24-
I/O with expansion signal modules for DC, relay,
serial or analog I/O for a maximum system of 284-
I/O
•Innovative signal boards snap onto front CPU
panel
The SIMATIC HMI Basic panels were
designed specifically for the S7-1200.
This Easy Book provides an introduction to
the S7-1200 PLC. In the following pages,
you will find an overview of the many
features and capabilities of the devices.
For additional information, refer to the
S7-1200 System Manual . You can also use the
following web site to search for specific information about products or to contact technical
support representatives:
http://www.siemens.com/automation/support-request

Preface
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For information about UL and FM certification, CE labeling, C-Tick and other standards, refer
to the Technical specifications (Page 97).
Contact your Siemens distributor or sales office for assistance in answering any technical
questions, for training, or for ordering S7 products. Because your sales representatives are
technically trained and have the most specific knowledge about your operations, process
and industry, as well as about the individual Siemens products that you are using, they can
provide the fastest and most efficient answers to any problems you might encounter.

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Manual, 05/2009, A5E02486774-01 5
Table of contents
Preface ...................................................................................................................................................... 3
1 Introducing the flexible and powerful S7-1200 ........................................................................................... 7
1.1 Expanding the capability of the CPU .............................................................................................9
1.2 Display panels..............................................................................................................................10
1.3 Mounting dimensions and clearance requirements .....................................................................11
2 STEP 7 Basic makes the work easy ........................................................................................................ 13
2.1 Help when you need it .................................................................................................................14
2.2 All of the tools you need...............................................................................................................17
3 Getting started......................................................................................................................................... 21
4 How the S7-1200 works........................................................................................................................... 31
4.1 Tasks performed every scan cycle ..............................................................................................31
4.2 Operating modes of the CPU.......................................................................................................32
4.3 Memory areas, addressing and data types..................................................................................33
4.4 Execution of the user program.....................................................................................................37
4.5 Protecting access to the CPU or code block is easy ...................................................................39
5 Programming options............................................................................................................................... 41
5.1 Easy to configure the hardware devices......................................................................................41
5.1.1 Configuring the operation of the CPU and modules ....................................................................46
5.1.2 Configuring the IP address of the CPU........................................................................................49
5.2 Structuring your user program is easy.........................................................................................50
5.2.1 Use OBs for organizing your user program .................................................................................53
5.2.2 FBs and FCs make programming the modular tasks easy..........................................................54
5.2.3 Data blocks provide easy storage for program data....................................................................55
5.3 Powerful and easy-to-use instruction set.....................................................................................57
5.3.1 Easy-to-use programming languages..........................................................................................57
5.3.2 Providing the basic instructions you expect.................................................................................58
5.4 Other features to make programming easy .................................................................................67
5.4.1 System memory and clock memory provide standard functionality.............................................67
5.4.2 Watch tables make monitoring the user program easy ...............................................................68
5.4.3 Saving elements in the project or global libraries ........................................................................69
5.4.4 Cross reference to show usage ...................................................................................................69
5.4.5 Using the "call path" to debug your user program .......................................................................70
6 Communications...................................................................................................................................... 73
6.1 PROFINET instructions (T-blocks)...............................................................................................74
6.2 PtP, USS, and Modbus communication protocols.......................................................................76
6.2.1 PtP instructions ............................................................................................................................77
6.2.2 Library of USS instructions ..........................................................................................................78

Table of contents
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6.2.3 Library of Modbus instructions .................................................................................................... 80
7 Using the pulse generators of the S7-1200.............................................................................................. 81
7.1 High-speed counters................................................................................................................... 82
7.2 Pulse-width modulation (PWM)................................................................................................... 86
8 Online functionality .................................................................................................................................. 89
8.1 Downloading a permanent IP address to an online CPU ........................................................... 89
8.2 Going online and connecting to a CPU....................................................................................... 90
8.3 Interacting with the online CPU................................................................................................... 91
8.4 Uploading from the online CPU .................................................................................................. 92
8.5 Displaying the diagnostic events................................................................................................. 94
8.6 Using a watch table for monitoring the CPU............................................................................... 94
8.7 Forcing variables in the CPU ...................................................................................................... 95
A Technical specifications........................................................................................................................... 97
A.1 General specifications................................................................................................................. 97
A.2 CPU modules ............................................................................................................................ 101
A.3 Signal boards ............................................................................................................................ 106
A.4 Digital signal modules ............................................................................................................... 108
A.5 Analog signal modules.............................................................................................................. 113
A.6 Communication modules........................................................................................................... 116
Index...................................................................................................................................................... 117

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Introducing the flexible and powerful S7-1200 1
The S7-1200 controller provides the flexibility and power to control a wide variety of devices
in support of your automation needs. The compact design, flexible configuration, and
powerful instruction set combine to make S7-1200 a perfect solution for controlling a wide
variety of applications.
The CPU combines a microprocessor, an integrated power supply, input and output circuits,
built-in PROFINET, high-speed motion control I/O, and on-board analog inputs in a compact
housing to create a powerful controller. After you download your program, the CPU contains
the logic required to monitor and control the devices in your application. The CPU monitors
the inputs and changes the outputs according to the logic of your user program, which can
include Boolean logic, counting, timing, complex math operations, and communications with
other intelligent devices.
The CPU provides a PROFINET port for communication over a PROFINET network.
Communication modules are available for communicating over RS485 or RS232 networks.
To provide security for your application, every S7-1200 CPU provides password protection
that allows you to configure access to the CPU functions.
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① Status LEDs for the on-board I/O
② Status LEDs for the operational state of the CPU
③ PROFINET connector
④ Memory card slot (under door)
⑤ Removable user wiring connector
The different CPU models provide a diversity of features and capabilities that help you create
effective solutions for your varied applications. For detailed information about a specific
CPU, see the technical specifications (Page 101).

Introducing the flexible and powerful S7-1200
1.1 Expanding the capability of the CPU
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Feature CPU 1211C CPU 1212C CPU 1214C
Physical size (mm) 90 x 100 x 75 90 x 100 x 75 110 x 100 x 75
User memory
•Work memory
•Load memory
•Retentive memory
•25 Kbytes
•1 Mbyte
•2 Kbytes
•25 Kbytes
•1 Mbyte
•2 Kbytes
•50 Kbytes
•2 Mbytes
•2 Kbytes
Local on-board I/O
•Digital
•Analog
•6 inputs/4 outputs
•2 inputs
•8 inputs/6 outputs
•2 inputs
•14 inputs/10 outputs
•2 inputs
Process image size
•Inputs
•Outputs
•1024 bytes
•1024 bytes
•1024 bytes
•1024 bytes
•1024 bytes
•1024 bytes
Signal modules expansion None 2 8
Signal board 1 1 1
Communication modules 3 3 3
High-speed counters
•Single phase
•Quadrature phase
3
•3 at 100 kHz
•3 at 80 kHz
4
•3 at 100 kHz
1 at 30 kHz
•3 at 80 kHz
1 at 20 kHz
6
•3 at 100 kHz
3 at 30 kHz
•3 at 80 kHz
3 at 20 kHz
Pulse outputs1 2 2 2
Memory card (optional) Yes Yes Yes
Real time clock retention time 10 days, typical / 6 day minimum at 40 degrees
Real math execution speed 18 μs/instruction
Boolean execution speed 0.1 μs/instruction
1 Only the DC output (non-relay) CPUs support the pulse outputs.

Introducing the flexible and powerful S7-1200
1.1 Expanding the capability of the CPU
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Manual, 05/2009, A5E02486774-01 9
1.1 Expanding the capability of the CPU
The S7-1200 family provides a variety of signal modules and signal boards for expanding the
capabilities of the CPU. You can also install additional communication modules to support
other communication protocols. For detailed information about a specific module, see the
technical specifications (Page 97).
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① Communication module (CM) ③ Signal board (SB)
② CPU ④ Signal module (SM)
Module Input only Output only Combination in/out
8 x DC In 8 x DC Out
8 x Relay Out
8 x DC In/8 x DC Out
8 x DC In/8 x Relay Out
Digital
16 x DC In 16 x DC Out
16 x Relay Out
16 x DC In/16 x DC Out
16 x DC In/16 x Relay Out
Signal module
(SM)
Analog 4 x Analog In 2 x Analog Out 4 x Analog In/2 x Analog Out
Digital - - 2 x DC In/2 x DC Out Signal board
(SB) Analog - 1 x Analog Out -
Communication module (CM)
•RS485
•RS232

Introducing the flexible and powerful S7-1200
1.2 Display panels
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1.2 Display panels
As visualization becomes a standard component for most machine designs, the SIMATIC
HMI Basic Panels provide touch-screen devices for basic operator control and monitoring
tasks.
Color panels KTP 600 Basic (PN or DP)
6" touch + key
KTP1000 Basic (PN or DP)
10" touch + key
TP1500 Basic PN
15" touch + key
Display
•Size
•Resolution
TFT, 256 colors
•5.7"
•320 x 240
TFT, 256 colors
•10.4"
•640 x 480
TFT, 256 colors
•15.1"
•1024 x 768
Control elements Touch screen
+ 6 tactile keys
Touch screen
+ 8 tactile keys
Touch screen
Interface
•PN
•DP
•PROFINET
•PROFIBUS DP, MPI, or
serial
•PROFINET
•PROFIBUS DP, MPI, or
serial
•PROFINET
•Tags
•Process screens
•Alarms
•Curves
•Recipe memory (integrated
flash)
•Recipes
•128
•50
•200
•25
•32 KB
•5 recipes, 20 data
records, 20 entries
•256
•50
•200
•25
•32 KB
•5 recipes, 20 data
records, 20 entries
•256
•50
•200
•25
•32 KB
•5 recipes, 20 data
records, 20 entries
Protection rating
Certification
IP65
CE, UL, cULus NEMA 4x
IP65
CE, UL, cULus NEMA 4x
IP65
CE, UL, cULus NEMA 4x
Monochrome panels KTP 400 Basic PN
4" touch + key
KTP 600 Basic PN
6" touch + key
Display
•Size
•Resolution
STN, gray scales
•3.8"
•320 x 240
STN, gray scales
•5.7"
•320 x 240
Control elements Touch screen + 4 tactile keys Touch screen + 6 tactile keys
Interface PROFINET PROFINET
Functionality
•Tags
•Process screens
•Alarms
•Curves
•Recipe memory
•Recipes
•128
•50
•200
•25
•32 KB integrated flash
•5 recipes, 20 data records, 20 entries
Protection rating
Certification
IP65
CE, UL, cULus NEMA 4x

Introducing the flexible and powerful S7-1200
1.3 Mounting dimensions and clearance requirements
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1.3 Mounting dimensions and clearance requirements
The S7-1200 PLC is designed to be easy to install. Whether mounted on a panel or on a
standard DIN rail, the compact size makes efficient use of space.
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S7-1200 Devices Width A Width B
CPU 1211C and CPU 1212C 90 mm 45 mm CPU
CPU 1214C 110 mm 55 mm
8- and 16-point DC and Relay (8I, 16I, 8Q, 16Q, 8I/8Q)
2- and 4-point Analog (4AI, 4AI/4AQ, 2AQ)
45 mm 22.5 mm Signal module (SM)
16I/16Q Relay (16I/16Q) 70 mm 35 mm
Communication module
(CM)
CM 1241 RS232 and CM 1241 RS485 30 mm 15 mm
The CPUs, SMs and CMs support DIN rail mounting and panel mounting. Use the DIN rail
clips on the module to secure the device on the rail. These clips also snap into an extended
position to provide screw mounting positions to mount the unit directly on a panel. The
interior dimension of the hole for the DIN clips on the device is 4.3 mm.

Introducing the flexible and powerful S7-1200
1.3 Mounting dimensions and clearance requirements
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12 Manual, 05/2009, A5E02486774-01
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① Side view ③ Vertical installation
② Horizontal installation ④ Clearance area
Always consider the following guidelines when planning your
installation:
•Separate the devices from heat, high voltage, and electrical
noise.
•Provide adequate clearance for cooling and wiring. A 25 mm
thermal zone must be provided above and below the unit for free
air circulation.
Refer to the
S7-1200 System Manual for specific requirements and
guidelines for installation.

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STEP 7 Basic makes the work easy 2
STEP 7 Basic provides a user-friendly environment to develop controller logic, configure HMI
visualization, and setup network communication. To help increase your productivity, STEP 7
Basic provides two different views of the project: a task-oriented set of portals that are
organized on the functionality of the tools (Portal view), or a project-oriented view of the
elements within the project (Project view).
Choose which view helps you work most efficiently. With a single click, you can toggle
between the Portal view and the Project view.
Portal view
① Portals for the different tasks
② Tasks for the selected portal
③ Selection panel for the
selected action
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④ Changes to the Project view
The Portal view provides a functional view of the project tasks and organizes the tools
according to the tasks to be accomplished. You can easily determine how to proceed and
which task to choose.
Project view
① Menus and toolbar
② Project navigator
③ Work area
④ Task cards
⑤ Inspector window
⑥ Changes to the Portal view
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⑦ Editor bar

STEP 7 Basic makes the work easy
2.1 Help when you need it
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The Project view provides access to all of the components within a project. With all of these
components in one place, you have easy access to every aspect of your project.
● The inspector window shows the properties and information for a selected object. As you
select different objects, the inspector window displays the properties that you can
configure.
● The editor bar shows all of the editors that are open. Click the different editor to toggle
between the open editors. You can also arrange two editors to appear together, arranged
either vertically or horizontally. This feature allows you to drag and drop between editors.
2.1 Help when you need it
To help you to find more information or to resolve issues quickly and
efficiently, STEP 7 Basic provides intelligent point-of-need
assistance.
Hovering over an element of the software interface displays the tool
tip. Some of the tool tips in the interface (such as for the instructions)
"cascade" to provide additional information, including a link to a
specific topic in the online information system (online help). A black
triangle alongside the tool tip signifies that more information is
available.
STEP 7 Basic provides a comprehensive online information and help system that describes
all of the SIMATIC TIA products that you have installed. The information system also
includes reference information and examples. To display the information system, choose
from the following access points:
● From the Portal view, select the Start portal and click the "Help" command.
● From the Project view, select the "Show help" command in the "Help" menu.
● From a cascading tool tip, click a link to display more information about that topic.
The information system opens in a window that does not obscure the work areas. Click the
"Show/hide contents" button on the information system to display the contents and undock
the help window. You can then resize the help window. Use the "Contents" or "Index" tabs to
search through the information system by topic or by key word.
If STEP 7 Basic is maximized, clicking the "Show/hide contents" button does not
undock the help window. Click the "Restore down" button on STEP 7 Basic to
undock the help window. You can then move and resize the help window.

STEP 7 Basic makes the work easy
2.1 Help when you need it
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Help window (default) Help window with contents displayed

STEP 7 Basic makes the work easy
2.1 Help when you need it
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Printing topics from the online help
To print from the information
system, click the "Print" button
on the help window.
The "Print" dialog allows you to
select the topics to print. Make
certain that the panel displays a
topic. You can then select any
other topic to print. Click the
"Print" button to send the
selected topics to your printer.

STEP 7 Basic makes the work easy
2.2 All of the tools you need
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2.2 All of the tools you need
Use the "Start" portal to create new projects and
to open existing projects.
Use the "Devices & Networks"
portal to configure all of the
hardware elements (PLC and HMI)
and also the networks for your
application.
Use the "PLC Programming" portal
to create the control program for
every PLC in the project.
Use the "Visualization" portal to
create the screens for the HMI
devices in your project.
Use the "Online & Diagnostics" portal to monitor
the devices on the network.

STEP 7 Basic makes the work easy
2.2 All of the tools you need
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Easy to insert the instructions into your user program
STEP 7 Basic provides task cards that contain the instructions for
your program. The instructions are grouped according to function.
To create your program, you drag instructions from the task card
onto a network.
Easy to drag-and-drop between editors
To help you perform tasks quickly and easily,
STEP 7 Basic allows you to drag and drop
elements from one editor to another. For
example, you can drag an input from the
CPU to the address of an instruction in your
user program. (You must zoom in at least
200% to select the I/O of the CPU.)
To display two editors at one time, use the
"Split editor" menu commands or buttons in
the toolbar.
To toggle between the editors that have been opened, click the icons in the editor bar.

STEP 7 Basic makes the work easy
2.2 All of the tools you need
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Easy to modify the appearance and operation of STEP 7 Basic
You can select a variety of settings, such as
the appearance of the interface, language, or
the directory for saving your work.
Select the "Settings" command from the
"Options" menu to change these settings.