Technical Safety Concept
Bridge from functional requirements to system-level implementation with technical safety requirements, architecture allocation, and safety mechanism specification per ISO 26262-4.
What You'll Learn
Build complete competency in technical safety concept through structured, progressive learning.
Derive Technical Safety Requirements
Transform functional safety requirements into implementable, testable technical safety requirements with full ASIL attribution.
Allocate Requirements to Architecture
Systematically allocate TSRs to hardware, software, and external measures with justified design decisions.
Select Appropriate Safety Mechanisms
Choose and specify safety mechanisms that achieve required diagnostic coverage for your ASIL level.
Calculate HW Architectural Metrics
Apply PMHF, SPFM, and LFM calculations and verify compliance against ISO 26262 Part 5 targets.
Specify Hardware-Software Interfaces
Document HSI specifications with signal definitions, timing constraints, and safety-relevant attributes.
Establish TSC Verification Evidence
Plan and document the verification strategy for TSC work products including review, analysis, and test evidence.
12 Comprehensive Chapters
Each chapter builds your technical safety concept expertise systematically from foundations to advanced application.
What is a TSC?
Understand the purpose, scope, and critical role of the Technical Safety Concept in the ISO 26262 lifecycle.
TSC in the Safety Lifecycle
Trace the TSC through ISO 26262-4 phases and understand its inputs, outputs, and dependencies.
Writing Technical Safety Requirements
Learn how to derive verifiable, ASIL-attributed TSRs from functional safety requirements.
System Architecture & Allocation
Allocate technical safety requirements to system elements: hardware, software, and external measures.
Safety Mechanisms Catalog
Survey the full catalog of hardware and software safety mechanisms applicable at system level.
Malfunction Analysis
Perform systematic malfunction analysis to identify failure modes and their potential safety impact.
Interfaces & HSI Specification
Define and document hardware-software interfaces required for safe system operation and traceability.
Development Interface Agreement
Structure the DIA to coordinate safety activities between customer and supplier organizations.
HW Metrics & Calculation
Apply PMHF, SPFM, and LFM calculations to validate hardware architectural metrics against ASIL targets.
Verification & Validation
Plan TSC verification activities: reviews, analysis, simulations, and tests at system level.
ISO 26262-4 Reference
Deep-dive into ISO 26262 Part 4 clauses, tables, and requirements relevant to TSC development.
Complete Worked Example
Walk through a full EPS TSC from FSC inputs to complete technical safety requirements and allocation matrix.
6 Interactive Tools
Experiment with visual tools that bring technical safety concept concepts to life.
System Architecture Allocator
Visualize how technical safety requirements are allocated to hardware and software elements.
TSR Derivation Tracer
Trace every TSR back to its parent functional safety requirement with ASIL attribution.
PMHF Calculator
Compute Probabilistic Metric for Hardware Failures against ASIL B/C/D targets interactively.
Safe State Machine
Model the system state transitions including normal, degraded, and safe states for your design.
HSI Interface Mapper
Define and visualize hardware-software interface signals, directions, and timing constraints.
Safety Mechanism Selector
Choose appropriate safety mechanisms based on fault type, ASIL level, and diagnostic coverage target.
Complete EPS (Electric Power Steering) Technical Safety Concept
See how a real-world EPS system translates functional safety goals into technical requirements, system architecture allocation, and safety mechanisms with full traceability.
- Safety goal SG-01 decomposed into 7 traceable TSRs with ASIL D inheritance
- Dual-processor monitoring architecture with cross-channel comparison at 10 ms cycle
- FMEA-driven safety mechanism selection: torque plausibility, end-stop detection, watchdog
- Hardware-software interface specification with 47 signals and timing budgets
- PMHF calculation: 2.3 × 10⁻⁸ h⁻¹ against ASIL D target of < 10⁻⁷ h⁻¹
TSR Allocation Matrix
Ready to Master Technical Safety Concepts?
Start your journey through 12 comprehensive chapters with interactive tools and a complete EPS worked example.
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