Project: Simplifier V2¶
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Summary¶
Develop first major update of Simplifier.
Overall safety lifecycle¶
1 Concept¶
Objective 7.2.1: To develop a level of environment understanding of the EUC and its environment (physical, legislative etc.) sufficient to enable the other safety lifecycle activities to be satisfactorily carried out.
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2 Overall scope definition¶
Objective 7.3.1: To determine the boundary of the EUC and the EUC control system; To specify the scope of the hazard and risk analysis (for example process hazards, environmental hazards, etc.).
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3 Hazard and risk analysis¶
Objective 7.4.1: To determine the hazards, hazardous events and hazardous situations relating to the EUC and the EUC control system (in all modes of operation), for all reasonably foreseeable circumstances, including fault conditions and reasonably foreseeable misuse (see 3.1.14 of IEC 61508-4); To determine the event sequences leading to the hazardous events; To determine the EUC risks associated with the hazardous events.
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4 Overall safety requirements¶
Objective 7.5.1: To develop the specification for the overall safety requirements, in terms of the safety functions requirements and safety integrity requirements, for the E/E/PE safety-related systems and other risk reduction measures, in order to achieve the required functional safety.
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5 Overall safety requirements allocation¶
Objective 7.6.1: To allocate the safety functions, contained in the specification for the overall safety requirements (both the safety functions requirements and the safety integrity requirements), to the designated E/E/PE safety-related systems and other risk reduction measures; To allocate a safety integrity level to each safety function to be carried out by an E/E/PE safety-related system.
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6 Overall operation and maintenance planning¶
Objective 7.7.1: To develop a plan for operating and maintaining the E/E/PE safety-related systems, to ensure that the required functional safety is maintained during operation and maintenance.
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7 Overall safety validation planning¶
Objective 7.8.1: To develop a plan for the overall safety validation of the E/E/PE safety-related systems.
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8 Overall safety installation and commissioning planning¶
Objective 7.9.1: To develop a plan for the installation of the E/E/PE safety-related systems in a controlled manner, to ensure that the required functional safety is achieved; To develop a plan for the commissioning of the E/E/PE safety-related systems in a controlled manner, to ensure that the required functional safety is achieved.
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9 E/E/PE system safety requirements specification¶
Objective 7.10.1: To define the E/E/PE system safety requirements, in terms of the E/E/PE system safety functions requirements and the E/E/PE system safety integrity requirements, in order to achieve the required functional safety.
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11 Other risk reduction measures¶
Objective 7.12.1: To create other risk reduction measures to meet the safety functions requirements and safety integrity requirements specified for such systems (outside the scope of this standard).
Requirements: none as outside the scope of 61508
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12 Overall installation and commissioning¶
Objective 7.13.1: To install the E/E/PE safety-related systems; To commission the E/E/PE safety-related systems.
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13 Overall safety validation¶
Objective 7.14.1: To validate that the E/E/PE safety-related systems meet the specification for the overall safety requirements in terms of the overall safety functions requirements and the overall safety integrity requirements, taking into account the safety requirements allocation for the E/E/PE safety-related systems developed according to 7.6.
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14 Overall operation, maintenance and repair¶
Objective 7.15.1: To ensure the functional safety of the E/E/PE safety-related systems is maintained to the specified level; To ensure that the technical requirements, necessary for the overall operation, maintenance and repair of the E/E/PE safety-related systems, are specified and provided to those responsible for the future operation and maintenance of the E/E/PE safety-related systems.
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15 Overall and modification retrofit¶
Objective 7.16.1: To define the procedures that are necessary to ensure that the functional safety for the E/E/PE safety-related systems is appropriate, both during and after the modification and retrofit phase has taken place.
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16 Decommissioning or disposal¶
Objective 7.17.1: To define the procedures that are necessary to ensure that the functional safety for the E/E/PE safety-related systems is appropriate in the circumstances during and after the activities of decommissioning or disposing of the EUC.
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E/E/PE system safety lifecycle (in realisation phase)¶
10.1 E/E/PE system design requirements specification¶
Objective: To specify the design requirements for each E/E/PE safety-related system, in terms of the subsystems and elements (see 7.10.2 of IEC 61508-1)
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10.2 E/E/PE system safety validation planning¶
Objective: To plan the validation of the safety of the E/E/PE safety-related system
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10.3 E/E/PE system design & development including ASICs & software¶
Objective: To design and develop the E/E/PE safety-related system (including ASICs if appropriate) to meet the E/E/PE system design requirements specification (with respect to the safety functions requirements and the safety integrity requirements (see 7.2))
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10.4 E/E/PE system integration¶
Objective: To integrate and test the E/E/PE safety-related system
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10.5 E/E/PE system installation, commissioning, operation & maintenance procedures¶
Objective: To develop procedures to ensure that the required functional safety of the E/E/PE safety-related system is maintained during operation and maintenance
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10.6 E/E/PE system safety validation¶
Objective: To validate that the E/E/PE safety-related system meets, in all respects, the requirements for safety in terms of the required safety functions and safety integrity
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Software safety lifecycle (in realisation phase)¶
10.1 Software safety requirements specification¶
Objective: To specify the requirements for safety-related software in terms of the requirements for software safety functions and the requirements for software systematic capability; To specify the requirements for the software safety functions for each E/E/PE safety-related system necessary to implement the required safety functions; To specify the requirements for software systematic capability for each E/E/PE safety-related system necessary to achieve the safety integrity level specified for each safety function allocated to that E/E/PE safety-related system
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10.2 Validation plan for software aspects of system safety¶
Objective: To develop a plan for validating the software aspects of system safety
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10.3 Software design & development¶
Objective: Architecture: To create a software architecture that fulfils the specified requirements for safety-related software with respect to the required safety integrity level; To evaluate the requirements placed on the software by the hardware architecture of the E/E/PE safety-related system, including the significance of E/E/PE hardware/software interactions for safety of the equipment under control
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Objective: Support tools and programming languages: To select a suitable set of tools, including languages and compilers, run-time system interfaces, user interfaces, and data formats and representations for the required safety integrity level, over the whole safety lifecycle of the software which assists verification, validation, assessment and modification
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Objective: Detailed design and development (software system design): To design and implement software that fulfils the specified requirements for safety-related software with respect to the required safety integrity level, which is analysable and verifiable, and which is capable of being safely modified
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Objective: Detailed design and development (individual software module design): To design and implement software that fulfils the specified requirements for safety-related software with respect to the required safety integrity level, which is analysable and verifiable, and which is capable of being safely modified
- Requirements (same as for previous objective):
Objective: Detailed code implementation: To design and implement software that fulfils the specified requirements for safety-related software with respect to the required safety integrity level, which is analysable and verifiable, and which is capable of being safely modified
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Objective: Software module testing: To verify that the requirements for safety-related software (in terms of the required software safety functions and the software systematic capability) have been achieved
To show that each software module performs its intended function and does not perform unintended functions
To ensure, in so far as it is appropriate, that configuration of PE systems by data fulfils the specified requirements for the software systematic capability
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Objective: Software integration testing: To verify that the requirements for safety-related software (in terms of the required software safety functions and the software systematic capability) have been achieved To show that all software modules, elements and subsystems interact correctly to perform their intended function and do not perform unintended functions To ensure, in so far as it is appropriate, that configuration of PE systems by data fulfils the specified requirements for the software systematic capability
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10.4 PE integration (hardware & software)¶
Objective: To integrate the software onto the target programmable electronic hardware; To combine the software and hardware in the safety-related programmable electronics to ensure their compatibility and to meet the requirements of the intended safety integrity level
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10.5 Software operation & maintenance procedures¶
Objective: To provide information and procedures concerning software necessary to ensure that the functional safety of the E/E/PE safety-related system is maintained during operation and modification
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10.6 Software aspects of system safety validation¶
Objective: To ensure that the integrated system complies with the specified requirements for safety-related software at the intended safety integrity level
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