MODMA_E.PDF

SIMATIC

Loadable Driver for Point-to-Point CPs

MODBUS Protocol, S7 is Master

Manual

Preface, Contents

Product Description

SIMATIC

Installation

Commissioning the Driver

Loadable Driver for Point-to-Point CPs

MODBUS Protocol

RTU Format

S7 is Master

Transmission Protocol

Function Codes

CPU - CP Interface

Manual

Diagnostics of the Driver

Application Example

Appendices

Technical Data

Literature List

Glossary, Index

Edition 2

Safety Guidelines

This manual contains notices which you should observe to ensure your own personal

safety, as well as to prevent damage to property. These notices are highlighted in the

manual by a warning triangle and are marked as follows according to the level of danger:

__________________________________________________________________

Danger

indicates that death, severe personal injury, or substantial property damage will result if

proper precautions are not taken.

__________________________________________________________________

Warning

indicates that death, severe personal injury, or substantial damage can result if proper

precautions are not taken.

__________________________________________________________________

Caution

indicates that minor personal injury or property damage can result if proper precautions are

not taken.

__________________________________________________________________

Note

draws your attention to particularly important information on the product, handling the

product, or to a particular part of the documentation.

__________________________________________________________________

Qualified Personnel

Only qualified personnel should be allowed to commission and operate the equipment.

Qualified persons are defined as persons who are authorized to commission, to ground,

and to tag circuits, equipment, and systems in accordance with established safety

practices and standards.

Correct Usage

Note the following:

_________________________________________________________________________

Warning

This device may only be used for the applications described in the catalog and the

technical description and only in connection with devices or components from other

manufacturers which have been approved or recommended by Siemens.

This product can only function correctly and safely if it is transported, stored, set up, and

installed correctly, and operated and maintained as recommended.

Trademarks

SIMATIC â and SINEC â are registered trademarks of SIEMENS AG.

Third parties using for their own purposes any other names in this manual which refer to

trademarks might infringe upon the rights of the trademark owners.

Disclaimer of Liability

The reproduction, transmission, or use of this document or its contents is

not permitted without express written authority. Offenders will be liable for

registration of a utility model or design, are reserved.

We have checked the contents of this manual for agreement with the

hardware and software described. Since deviations cannot be precluded

entirely, we cannot guarantee full agreement. However, the data in this

manual are reviewed regularly and any necessary corrections included in

subsequent editions. Suggestions for improvement are welcomed.

ã Siemens AG 1998

Subject to change without prior notice.

Preface

Purpose of this

Manual

The information in this manual will enable you to establish and commission

a data link between a CP and a “Modbus capable” control system.

Contents of the

Manual

This manual describes the function of the loadable driver and how it is

linked to the hardware and software of the CP 341 and CP 441-2

communications processors.

The manual covers the following topics:

· Product Description / Installation

· Commissioning the Driver / Installation / Parameter Assignment

CPU-CP Interface

· Transmission Protocol / Function Codes

· Diagnostics of the Driver

ApplicationExample

Validity of the

Manual

This manual is valid for the following software package:

Product

Order Number

from Version

Loadable Driver for Point-to-

Point CPs

6ES7 870-1AA00-0YA0

2.0

Note

This manual contains the driver description as is valid at the time of

publication.

How to Access the

Information in this

Manual

To enable you to access the information in this manual more easily, we

would like to draw your attention to the following:

· The next few pages contain a complete list of contents.

Further Sources of

Information

Any further information (installation, commissioning, etc.) can be found in

the manual for the CP used.

Loadable Driver for Point-to-Point CPs, S7 is Master

6ES7 870-1AA00-0YA0; Manual Edition 2

iii

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