GB/T 16855.2-2015Safety of machinery -- Safety-related parts of control systems -- Part 2: Validation (English PDF)

Foreword

GB/T 16855 Safety of Machinery – Safety-Related Parts of Control Systems consists

of the following two parts.

--- Part 1.General Principles for Design.

--- Part 2.Validation.

This Part is Part 2 of GB/T 16855.

This Part was drafted as per the rules specified in GB/T 1.1-2009.

This Part replaced GB/T 16855.2-2007 Safety of Machinery – Safety-Related Parts of

Control Systems – Part 2.Validation. Compared with GB/T 16855.2-2007, this Part

has the major technical changes as follows besides the editorial modifications.

--- Add the validation applicable to the performance level in the Scope (see Clause

1 of this Edition; Clause 1 of 2007 Edition);

--- Add the validation of the safety requirements and specifications of the safety

function (see Clause 7 of this Edition);

--- Add the performance level and its related parameters (MTTFd, DCavg and CCF),

and the validation of safety-related software (see Clause 9 of this Edition, Clause

1 of 2007 Edition);

--- Add confirmation of technical documents and usage information (see Clause 12

of this Edition);

--- Add the failure characteristics validation and diagnostic measure examples (see

Appendix E of this Edition).

This Part uses translation method to equivalently adopt ISO 13849-2.2012 Safety of

Machinery – Safety-Related Parts of Control Systems – Part 2.Validation (English

Version).

This Part was proposed by and under the jurisdiction of National Technical Committee

for Standardization of Machinery Safety (SAC/TC 208).

Drafting organizations of this Part. Rugao Packaging & Foodstuff Machinery Co., Ltd.;

National Machine Tool Product Quality Supervision & Inspection Center; Nanjing

University of Science and Technology; Omron Industrial Automation (China) Co., Ltd.;

China Productivity Center for Machinery; Opto-Mechanical Engineering Institute of

Nanjing Forestry University; Pilz Industrial Automation (Shanghai) Co., Ltd.; ABB

(China) Ltd.; and Siemens Ltd. China.

Chief drafting staffs of this Part. Shi Chuanming, Ju Likai, Zhao Qinzhi, Zhang Xiaofei,

Li Qin, Ning Yan, Ju Ronghua, Li Liyan, Chu Weizhong, Zhang Tian Qiang, Luo Guang,

Cheng Hongbing, Liu Ying, Chen Nengyu, Huang Zhijiong, Zhang Yarong, Song

Xiaoning, Wu Jian, Wang Zheng, Fu Huiqing, Liu Zhiyong, Jiang Tao, and Yu Heng.

The historical editions replaced by this Standard are as follows.

--- GB/T 16855.2-2007.

1 Scope

This Part specifies the procedures and conditions to be followed for the validation by

analysis and testing of.

2 Normative References

The following documents are essential to the application of this document. For the

dated documents, only the versions with the dates indicated are applicable to this

document; for the undated documents, only the latest version (including all the

amendments) is applicable to this document.

GB/T 15706-2012 Safety of Machinery - General Principles for Design - Risk

Assessment and Risk Reduction (ISO 12100.2010, IDT)

3 Terms and Definitions

For the purpose of this document, the terms and definitions given in GB/T 15706-2012

and GB/T 16855.1-2008 apply.

4 Validation Process

The validation plan shall identify and describe the requirements for carrying out the

validation process for the specified safety functions, their categories and performance

levels.

If necessary, a specific product-related fault list shall be generated as a reference

document for the validation process of the safety-related part(s). The list can be based

on the appropriate generic list(s) found in the annexes.

5 Validation by Analysis

The s election of an analysis technique depends upon the particular object. Two basic

techniques exist, as follows.

6 Validation by Testing

The accuracy of measurements during the validation by testing shall be appropriate

for the test carried out. In general, these measurement accuracies shall be within 5°C

for temperature measurements and 5% for the following.

Unless otherwise specified, the tests shall be made on a single production sample of

the safety-related part being tested.

7 Validation of Safety Requirements Specification for Safety Functions

Prior to the validation of the design of the SRP/CS, or the combination of SRP/CS

providing the safety function, the requirements specification for the safety function shall

be verified to ensure consistency and completeness for its intended use.

8 Validation of Safety Functions

The validation of safety functions shall demonstrate that the SRP/CS, or combination

of SRP/CSs, provides the safety function(s) in accordance with their specified

characteristics.

9 Validation of Performance Levels and Categories

Where the safety function is implemented by two or more safety-related parts,

validation of the combination - by analysis and, if necessary, by testing - shall be

undertaken to establish that the combination achieves the performance level specified

in the design.

10 Validation of Environmental Requirements

The performance specified in the design of the SRP/CS shall be validated with respect

to the environmental conditions specified for the control system.

11 Validation of Maintenance Requirements

The validation process shall demonstrate that the provisions for maintenance

requirements specified in GB/T 16855.1-2008, Clause 9, Paragraph 2, have been

implemented.

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