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GB/T 37157-2018Safety of machinery -- Evaluation of fault masking serial connection of interlocking devices with potential free contacts (English PDF)

机械安全串联的无电势触点联锁装置故障掩蔽的评价

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

December 28, 2018

Implementation date

July 1, 2019

Scope

GB/T 37157-2018 is the English-translated version of 机械安全串联的无电势触点联锁装置故障掩蔽的评价.

GB/T 37157-2018 is the Chinese standard "Safety of machinery -- Evaluation of fault masking serial connection of interlocking devices with potential free contacts".

Its scope clause reads: This standard gives and explains that fault masking is interlocked with multiple series potential-free contacts connected to a logic unit (K) performing diagnostics.

The principle of the device (B1 ~ Bn) (see Figure 1 ~ Figure 7). This standard further gives an estimate of how to estimate the probability of fault masking and the associated A guide to the maximum DC value of the lock device.

This standard only applies to interlocking devices in which both channels are physically connected in series. This standard has two purposes. --- Provide users with a guide to estimate the maximum DC value; --- As a guide to SRP/CS design.

Note 1. Interlocking devices with integrated self-monitoring function are outside the scope of this standard. Note 2. The diagnostic methods used by the logic unit also impose limitations.

Note 3. This standard is not limited to mechanically actuated position sensors. Its clauses include terms and definitions.

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Document preview — GB/T 37157-2018

National Standard of the People's Republic of China

ICS: 13.110
Classification: J 09

Issued by: State Administration for Market Regulation, China National Standardization Administration

Foreword
1 Scope
2 Normative references
3 Terms and Definitions
4 fault masking
4.1 Overview
4.2 Direct fault masking
4.3 Unexpected reset of fault
4.4 Unexpected reset of cable fault
5 Series interlocking device diagnostic coverage (DC) evaluation method
6 series device limits on DC
6.1 Overview
6.2 Easy way to determine the maximum DC that can be reached
6.3 General method for determining the maximum DC that can be reached
6.3.1 Estimation of fault masking probability
6.3.2 Determination of the maximum DC that can be reached
7 Avoid fault masking
Appendix A (informative) 6.2 and 6.3 evaluation methods application example

1 Scope

This standard gives and explains that fault masking is interlocked with multiple series potential-free contacts connected to a logic unit (K) performing diagnostics.

The principle of the device (B1 ~ Bn) (see Figure 1 ~ Figure 7). This standard further gives an estimate of how to estimate the probability of fault masking and the associated

A guide to the maximum DC value of the lock device. This standard only applies to interlocking devices in which both channels are physically connected in series.

This standard has two purposes.

--- Provide users with a guide to estimate the maximum DC value;

--- As a guide to SRP/CS design.

Note 1. Interlocking devices with integrated self-monitoring function are outside the scope of this standard.

Note 2. The diagnostic methods used by the logic unit also impose limitations.

Note 3. This standard is not limited to mechanically actuated position sensors.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this article.

Pieces. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 18831-2017 Principles for the design and selection of interlocks for mechanical safety and protection devices (ISO 14119.

2013, IDT)

ISO 12100 Mechanical Safety Design General Risk Assessment and Risk Reduction (Safetyofmachinery-Generalprinciplesfor design-Riskassessmentandriskreduction)

ISO 13849-1.2006 Safety-related components for safety control systems - Part 1. General rules for design (Safetyofmachin- ery-Safety-relatedpartsofcontrolsystems-Part 1.Generalprinciplesfordesign)

3 Terms and definitions

The following terms and definitions defined by ISO 13849-1, GB/T 18831 and ISO 12100 apply to this document.

3.1 Fault masking

Unexpected reset of the fault or failure of the SRP/CS through the operation of the fault-free component in the SRP/CS is not detected.

3.2 Series device

A plurality of series of potential-free contact (dry contact) devices (B1~Bn) connected to a logic unit (K) performing diagnostics.

3.3 Signal evaluation of redundant channels of the same polarity

A method in which a logic unit for a safety function evaluates a redundant signal having the same supply voltage.

3.4 Signal evaluation of opposite polarity redundant channels

A method in which a logic unit for a safety function evaluates a redundant signal whose ground polarity is a second channel.

GB/T 41344.2 | GB/T 41344.1 | GB/T 35076 | GB/T 17889.7 | GB/T 16855.1 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 37 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 18831-2017Safety of machinery -- Interlocking devices associated with guards -- Principles for design and selection

ISO 14119 · ISO 12100 · ISO 13849

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