Step7

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Preface, Contents Bit Logic Instructions

1 2 3 4 5 6 7 8 9 10 11 12 13 14

SIMATIC Statement List (STL) for S7-300 and S7-400 Programming

Comparison Instructions Conversion Instructions Counter Instructions Data Block Instructions Logic Control Instructions

Reference Manual

Integer Math Instructions Floating-Point Math Instructions Load and Transfer Instructions Program Control Instructions Shift and Rotate Instructions Timer Instructions Word Logic Instructions Accumulator Instructions Appendices

This manual is part of the documentation package with the order number: 6ES7810-4CA08-8BW1

Overview of All STL Instructions Programming Examples Parameter Transfer

A B C

Edition 03/2006
A5E00706960-01

Index

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 to property damage only have no safety alert symbol. The 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 notice 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