Siemens DS III PROFIsafe Series Bedienungsanleitung

Introduction

General safety instructions

Device-specific safety

instructions

Appendix

List of

Abbreviations/Acronyms

SITRANS

Pressure transmitter

Functional safety for SITRANS P,

series DS III PROFIsafe

Product information

07/2006

A5E00849297-01

Supplement to the Operating Instructions

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 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 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.

Prescribed Usage

Note the following:

Warning

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

connection with devices or components from other manufacturers which have been approved or recommended by

Siemens. Correct, reliable operation of the product requires proper transport, storage, positioning and assembly

as well as careful operation and maintenance.

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

Automation and Drives

Postfach 48 48

90437 NÜRNBERG

GERMANY

Order No.: A5E00849297-01

Edition 08/2006

Technical data subject to change

Functional safety for SITRANS P, series DS III PROFIsafe

Product information, 07/2006, A5E00849297-01 iii

Table of contents

1 Introduction............................................................................................................................................. 1-1

1.1 Purpose of this document .......................................................................................................... 1-1

1.2 Scope of this document ............................................................................................................. 1-1

1.3 History........................................................................................................................................ 1-1

1.4 Further information..................................................................................................................... 1-2

2 General safety instructions ..................................................................................................................... 2-1

2.1 Safety-instrumented system ...................................................................................................... 2-1

2.2 Safety Integrity Level (SIL)......................................................................................................... 2-2

3 Device-specific safety instructions .......................................................................................................... 3-1

3.1 Application range ....................................................................................................................... 3-1

3.2 Safety function ........................................................................................................................... 3-2

3.3 Settings ...................................................................................................................................... 3-3

3.4 Behavior in case of faults........................................................................................................... 3-4

3.5 Maintenance/Checking .............................................................................................................. 3-4

3.6 Safety characteristics................................................................................................................. 3-5

A Appendix.................................................................................................................................................A-1

A.1 Literature and standards ............................................................................................................A-1

A.2 SIL Declaration of Conformity....................................................................................................A-2

A.3 Test report (excerpt) ..................................................................................................................A-5

B List of Abbreviations/Acronyms...............................................................................................................B-1

B.1 Abbreviations .............................................................................................................................B-1

Glossary ..................................................................................................................................... Glossary-1

Index................................................................................................................................................ Index-1

Tables

Table 2-1 Safety Integrity Level ................................................................................................................. 2-3

Table of contents

Functional safety for SITRANS P, series DS III PROFIsafe

iv Product information, 07/2006, A5E00849297-01

Functional safety for SITRANS P, series DS III PROFIsafe

Product information, 07/2006, A5E00849297-01 1-1

Introduction 1

1.1 Purpose of this document

This document contains information and safety notes that you will require when using the

pressure transmitter in safety-instrumented systems.

It is aimed at persons who install the device mechanically, connect it electrically,

parameterize and commission it, as well as at service and maintenance engineers.

1.2 Scope of this document

This document deals with the pressure transmitters exclusively as a part of a safety function.

This documentation is applicable only in connection with the following documentation:

No. Name Order number

/1/ Operating Instructions for SITRANS P, series DS III PA A5E00053276

1.3 History

This history establishes the correlation between the current documentation and the valid

firmware of the device.

The documentation of this edition is applicable for the following firmware:

Edition Firmware identification type

plate

System integration Installation path for PDM

06/2006

FW: from 301.02.01K PDM V 6.0.2;

DD version 01.02.01.50

SITRANS P DS III PA

PROFIsafe

The most important changes in the documentation when compared with the respective

previous edition are given in the following table.

Edition Remark

06/2006

First edition

Introduction

1.4 Further information

Functional safety for SITRANS P, series DS III PROFIsafe

1-2 Product information, 07/2006, A5E00849297-01

1.4 Further information

Information

The contents of these instructions shall not become part of or modify any prior or existing

agreement, commitment or legal relationship. All obligations on the part of Siemens AG are

contained in the respective sales contract which also contains the complete and solely

applicable warranty conditions. Any statements contained herein do not create new

warranties or modify the existing warranty.

The content reflects the technical status at the time of printing. We reserve the right to make

technical changes in the course of further development.

Siemens Regional Offices

If you need more information or have particular problems which are not covered sufficiently

by the operating instructions, contact your local Siemens Regional Office. You will find the

address of your local Siemens Regional Office on the Internet.

Product information on the Internet

The Programming Manual forms a part of the supplied CD and is also available on the

Siemens homepage on the Internet.

On the supplied CD, you will also find the technical data sheet containing the ordering data,

the Device Install software for SIMATIC PDM for subsequent installation and the generic

station description (GSD).

See also

Siemens Regional Offices (www.siemens.com/processinstrumentation/contacts)

Product information on the Internet (http://www.siemens.com/sitransp)

Instructions and Manuals (http://www.siemens.com/processinstrumentation/documentation)

Functional safety for SITRANS P, series DS III PROFIsafe

Product information, 07/2006, A5E00849297-01 2-1

General safety instructions 2

2.1 Safety-instrumented system

Definition: Safety-instrumented system

A safety-instrumented system executes the safety functions that are required to achieve or

maintain a safe status in a system. It consists of a sensor, logic unit/control system and final

controlling element.

Example:

A safety-instrumented system is made up of a pressure transmitter, a limit signal sensor and

a control valve.

Definition: Safety function

Defined function executed by a safety-instrumented system with the objective of achieving or

maintaining a safe system status taking into account a defined dangerous occurrence.

Example:

Limit pressure monitoring

Definition: Dangerous failure

Failure with the potential to bring the safety-instrumented system into a dangerous or non-

functional status.

Description

The sensor, logic unit/control system and final controlling element combine to form a safety-

instrumented system, which executes a safety function.

Note

This document deals with the SITRANS P pressure transmitter exclusively as a part of a

safety function.

General safety instructions

2.2 Safety Integrity Level (SIL)

Functional safety for SITRANS P, series DS III PROFIsafe

2-2 Product information, 07/2006, A5E00849297-01

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Figure 2-1 Example of a safety-instrumented system with a bus

Functioning of the system as shown in the example

The transmitter generates a process-specific measured value. The programmable logic

control (PLC) monitors this value in case it exceeds a preset limit value. If a fault occurs, the

PLC generates a shutdown signal for the connected positioner. The positioner switches the

corresponding valve to the defined safety position. The communication with the positioner

via PROFIBUS PA or FOUNDATION Fieldbus remains unrestricted, i.e. position and status

messages are still possible.

2.2 Safety Integrity Level (SIL)

Definition: SIL

The international standard IEC 61508 defines four discrete Safety Integrity Levels (SIL) from

SIL 1 to SIL 4. Each level corresponds to the probability range for the failure of a safety

function. The higher the SIL of the safety-instrumented system, the higher probability that the

required safety function will work.

General safety instructions

2.2 Safety Integrity Level (SIL)

Functional safety for SITRANS P, series DS III PROFIsafe

Product information, 07/2006, A5E00849297-01 2-3

The achievable SIL is determined by the following safety characteristics:

•Average probability of dangerous failure of a safety function in case of demand (PFDAVG)

•Hardware fault tolerance (HFT)

•Safe failure fractions (SFF)

Description

The following table shows the dependency of the SIL on the "average probability of

dangerous failures of a safety function of the entire safety-instrumented system" (PFDAVG)

The table deals with "Low demand mode", i.e. the safety function is required a maximum of

once per year on average.

Table 2-1 Safety Integrity Level

SIL PFD

AVG

4 ≥ 10-5...< 10-4

3 ≥ 10-4...< 10-3

2 ≥ 10-3...< 10-2

1 ≥ 10-2...< 10-1

The "average probability of dangerous failures of the entire safety-instrumented system"

(PFDAVG) is normally split between the three sub-systems in the following figure.

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Figure 2-2 Example of PFD distribution

The following table shows the achievable Safety Integrity Level (SIL) for the entire safety-

instrumented system for type B subsystems depending on the safe failure fraction (SFF) and

the hardware fault tolerance (HFT). Type B subsystems include analog transmitters and

shut-off valves without complex components, e.g. microprocessors (also see IEC 61508,

Section 2).

HFT SFF

0 1 (0) 1) 2 (1)

< 60 % Not permissible SIL 1 SIL 2

60 to 90 % SIL 1 SIL 2 SIL 3

90 to 99 % SIL 2 SIL 3 SIL 4

> 99 % SIL 3 SIL 4 SIL 4

1) As per IEC 61511-1, Section 11.4.4

General safety instructions

2.2 Safety Integrity Level (SIL)

Functional safety for SITRANS P, series DS III PROFIsafe

2-4 Product information, 07/2006, A5E00849297-01

As per IEC 61511-1, Section 11.4.4, the hardware fault tolerance (HFT) can be reduced by

one (values in brackets) for sensors and final controlling elements with complex components

if the following conditions are applicable for the device:

•The device is ready for operation.

•The user can configure only the process-related parameters, e.g. control range, signal

direction in case of a fault, limiting values, etc.

•The configuration level of the firmware is blocked against unauthorized operation.

•The function requires SIL of less than 4.

The pressure transmitter fulfills these conditions.

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