Table of Contents
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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
Easy Book
Manual, 05/2009, A5E02486774-01
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