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Bit Logic Instructions 1
2
Comparison Instructions
Conversion Instructions 3
SIMATIC
Counter Instructions 4
Ladder Logic (LAD) for S7-300 and Data Block Instructions 5
S7-400 Programming
Logic Control Instructions 6
Reference Manual
Integer Math Instructions 7
Floating Point Math 8
Instructions
Move Instructions 9
Program Control Instructions 10
Shift and Rotate Instructions 11
Status Bit Instructions 12
Timer Instructions 13
Word Logic Instructions 14
This manual is part of the documentation package with the order Overview of All LAD
number: Instructions A
6ES7810-4CA10-8BW1
Programming Examples B
05/2010 C
A5E02790079-01 Working with Ladder Logic
Legal information
Warning notice system
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 product/system described in this documentation may be operated only by personnel qualified for the specific
task in accordance with the relevant documentation for the specific task, in particular its warning notices and
safety instructions. Qualified personnel are those who, based on their training and experience, are capable of
identifying risks and avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be adhered to. The information in the relevant documentation must be observed.
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 A5E02790079-01 Copyright © Siemens AG 2010.
Industry Sector Ⓟ 02/2010 Technical data subject to change
Postfach 48 48
90026 NÜRNBERG
GERMANY
Preface
Purpose
This manual is your guide to creating user programs in the Ladder Logic (LAD) programming
language.
This manual also includes a reference section that describes the syntax and functions of the language
elements of Ladder Logic.
Basic Knowledge Required
The manual is intended for S7 programmers, operators, and maintenance/service personnel.
In order to understand this manual, general knowledge of automation technology is required.
In addition to, computer literacy and the knowledge of other working equipment similar to the PC (e.g.
programming devices) under the operating systems MS Windows XP, MS Windows Server 2003 or
MS Windows 7 are required.
Scope of the Manual
This manual is valid for release 5.5 of the STEP 7 programming software package.
Compliance with IEC 1131-3
LAD corresponds to the “Ladder Logic” language defined in the International Electrotechnical
Commission's standard IEC 1131-3. For further details, refer to the table of standards in the STEP 7
file NORM_TBL.RTF.
Ladder Logic (LAD) for S7-300 and S7-400 Programming
Reference Manual, 05/2010, A5E02790079-01 3
Preface
Requirements
To use this Ladder Logic manual effectively, you should already be familiar with the theory behind
S7 programs which is documented in the online help for STEP 7. The language packages also use the
STEP 7 standard software, so you should be familiar with handling this software and have read the
accompanying documentation.
This manual is part of the documentation package "STEP 7 Reference".
The following table displays an overview of the STEP 7 documentation:
Documentation Purpose Order Number
STEP 7 Basic Information with Basic information for technical 6ES7810-4CA10-8BW0
Working with STEP 7, personnel describing the methods of
Getting Started Manual implementing control tasks with
Programming with STEP 7 STEP 7 and the S7-300/400
programmable controllers.
Configuring Hardware and
Communication Connections,
STEP 7
From S5 to S7, Converter Manual
STEP 7 Reference with Provides reference information and 6ES7810-4CA10-8BW1
Ladder Logic (LAD) / Function Block describes the programming
Diagram (FDB) / Statement List (STL) for languages LAD, FBD and STL, and
S7-300/400 manuals standard and system function
Standard and System Function extending the scope of the
for S7-300/400 STEP 7 basic information.
Volume 1 and Volume 2
Online Helps Purpose Order Number
Help on STEP 7 Basic information on programming Part of the STEP 7
and configuring hardware with Standard software.
STEP 7 in the form of an online
help.
Reference helps on AWL/KOP/FUP Context-sensitive reference Part of the STEP 7
Reference help on SFBs/SFCs information. Standard software.
Reference help on Organization Blocks
Ladder Logic (LAD) for S7-300 and S7-400 Programming
4 Reference Manual, 05/2010, A5E02790079-01
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