2026-09-21 · Equipo editorial KeXinMaterials
ISO 13849-1 PL Maquinaria + IEC 62061 SIL + Reglamento Máquinas UE B2B Guía
ISO 13849-1:2023 Edition 4 "Seguridad de las máquinas - Partes de los sistemas de mando relativas a la seguridad" es la norma global para SRP/CS. Companion IEC 62061:2022 SIL.
ISO 13849-1 Scope + PL Determination
ISO 13849-1:2023 Edition 4. 10 parts. PL a-e determined by Severity x Frequency x Possibility of Avoidance.
ISO 13849-1:2023: "Safety of machinery - Safety-related parts of control systems". Edition 4. Replaces ISO 13849-1:2015. Currently active Edition 4.
Scope: Safety-related parts of control systems (SRP/CS). Including mechanical + pneumatic + hydraulic + electrical + electronic + programmable electronic.
10 parts: Part 1 (General principles for design), Part 2 (Validation), Part 3 (Application notes). Part 1 is core.
Application: Industrial robots + presses + lifts + packaging + CNC + conveyors + food processing + textile + printing + woodworking + metalworking.
PL (Performance Level): Discrete levels a, b, c, d, e. Higher level = lower probability of dangerous failure per hour (PFHd).
PL determination per ISO 13849-1 § 4.5: Severity (S1 / S2) x Frequency of exposure (F1 / F2) x Possibility of avoidance (P1 / P2). Result: PL a-e per Table 1.
Severity S1: Slight injury (reversible). S2: Serious injury (irreversible) or death.
Frequency F1: Rare / less than once per 2 weeks. F2: Frequent / more often than once per 2 weeks.
Possibility of avoidance P1: Possible under specific conditions. P2: Scarcely possible.
PL a: PFHd >= 10^-5 to < 10^-4 per hour. SIL 1 equivalent.
PL b: PFHd >= 3 x 10^-6 to < 10^-5. SIL 1-2.
PL c: PFHd >= 10^-6 to < 3 x 10^-6. SIL 2.
PL d: PFHd >= 10^-7 to < 10^-6. SIL 2-3.
PL e: PFHd >= 10^-8 to < 10^-7. SIL 3.
Geographic adoption: EU EN ISO 13849-1. US OSHA 1910.147 + ANSI B11 + NFPA 79. Japan JIS B 9705-1. China GB/T 16855.1.
B2B relevance: For B2B protective cases containing safety-related machinery control equipment (safety PLC / safety relay / safety contactor / E-Stop / light curtain / safety mat / interlock), ISO 13849-1 PL compliance is procurement requirement.
Categories B / 1 / 2 / 3 / 4 + Architecture
Categories B / 1 / 2 / 3 / 4 per ISO 13849-1 Table 4. Structural architecture. Required per PL.
Category B: Basic category. Single channel. No redundancy. No diagnostics. Suitable for PL a only.
Category 1: Single channel with well-tried components + basic safety principles. Suitable for PL c.
Category 2: Single channel + tested. Periodic diagnostic test required. Suitable for PL c-d depending on DC.
Category 3: Dual channel with cross-monitoring. One fault does not lead to loss of safety. Suitable for PL d.
Category 4: Dual channel with cross-monitoring + high DC + fault accumulation considered. Suitable for PL e.
Category selection per ISO 13849-1 Table 4: Each PL has minimum category. PL a = any category (typically B). PL b = any category (typically 1). PL c = categories 1 / 2 / 3. PL d = categories 3. PL e = category 4.
Diagnostic coverage (DC): Per ISO 13849-1 Table F.1. DCavg (average diagnostic coverage). Categories low (< 60%) / medium (60-90%) / high (90-99%) / very high (>= 99%).
DC per safety function: For Category 2 + PL d: DCavg >= 90% (medium). For Category 3 + PL d: DCavg >= 60% (low) sufficient. For Category 4 + PL e: DCavg >= 99% (very high) typically.
Common cause failure (CCF): Per ISO 13849-1 Annex F. Score 0-100. PL d/e typically require CCF score >= 65.
CCF mitigation: Separation (20 points) + diversity (20 points) + common component analysis (5 points) + environmental control (25 points) + design analysis (5 points) + training (5 points). Total 80+ for PL d/e.
Example Category 3 architecture: Dual E-stop button channels + dual safety relay inputs + dual safety contactor outputs + cross-monitoring. PL d typical.
Example Category 4 architecture: Dual safety PLC channels + dual CPU + lockstep + dual safety outputs + watchdog + diagnostics. PL e typical.
B2B recommendation: For machinery case, identify required PL + select Category per PL + ensure DC + CCF + safety function validation per ISO 13849-2.
PFHd + T10D + Mission Time + B10d
PFHd (Probability of dangerous Failure per Hour) + T10D (Mission Time) + B10d (Component Life Cycles) per ISO 13849-1.
PFHd (Probability of dangerous Failure per Hour): Per ISO 13849-1 § 4.5.4. Sum of dangerous failure rates of all components in SRP/CS.
PFHd calculation: PFHd = sum (lambda D for each component) + sum (lambda DU x (1 - DC)) + sum (lambda DD). Lambda D = dangerous failure rate. DC = diagnostic coverage.
PFHd target per PL: PL a 10^-5-10^-4. PL b 3 x 10^-6-10^-5. PL c 10^-6-3 x 10^-6. PL d 10^-7-10^-6. PL e 10^-8-10^-7.
T10D (Mission Time): Per ISO 13849-1 § 4.5.4. Time after which component is replaced. Typical T10D = 20 years for safety components. T10D + replacement strategy ensures total PFHd remains within PL target over service life.
T10D per component: Safety PLC = 20 years. Safety relay = 20 years. Safety contactor = 20 years (mechanical wear). Light curtain = 20 years. E-Stop button = 20 years (mechanical wear).
B10d (Number of cycles until 10% of components fail dangerously): Per ISO 13849-1 § 4.5.4. For mechanical components subject to wear. B10d specified by manufacturer.
B10d to T10D conversion: For mechanical components, B10d / (number of cycles per hour x mission time) / 0.1 = T10D. Per ISO 13849-1 § 4.5.4.
Example calculation: E-Stop button B10d = 100,000 cycles. Cycles per hour = 1. Mission time = 20 years = 175,200 hours. T10D = 100,000 / (1 x 175,200) / 0.1 = 5.7 years. Replace every 5.7 years.
Mission time documentation: Required per ISO 13849-1. Service life + replacement schedule per safety component.
Lifecycle verification: For PL d / PL e, manufacturer must specify T10D + provide replacement schedule.
B2B recommendation: For machinery case, calculate PFHd per safety function + verify against PL target + document T10D + B10d + replacement schedule.
IEC 62061 + EU Machinery Regulation + EN ISO 13849 Comparison
IEC 62061 SIL-based vs ISO 13849-1 PL-based. EU Machinery Regulation 2023/1230. Either can be used for compliance.
IEC 62061:2022: "Safety of machinery - Functional safety of safety-related electrical, electronic and programmable electronic control systems". Edition 2. SIL-based (extends IEC 61508).
IEC 62061 scope: Electrical / electronic / programmable electronic control systems on machinery. SIL 1-3 (typically). SIL-based allocation.
IEC 62061 vs ISO 13849-1: IEC 62061 SIL-based. ISO 13849-1 PL-based. Either can be used for EU Machinery Regulation compliance.
EU Machinery Regulation (EU) 2023/1230: Replaces Machinery Directive 2006/42/EC. Effective 20 January 2027 (2-year transition). New scope includes autonomous machinery, AI, IoT, cybersecurity.
EU Machinery Regulation key changes: Cybersecurity mandatory for connected machinery. AI risk assessment required. Declaration of conformity via DoC. CE marking. Notified body involvement for high-risk machinery.
Annex III high-risk machinery: Listed per EU Machinery Regulation. Includes woodworking machines, presses, lifts, vehicle lifts, certain robots, certain PPE-related machines.
Harmonized standards under EU Machinery Regulation: EN ISO 13849-1 (PL-based) + EN IEC 62061 (SIL-based). Type-C standards per sector (e.g., EN 415 for packaging, EN 528 for stacker cranes).
Type-A / Type-B / Type-C standards per ISO 12100: Type-A (basic safety standards, e.g., EN ISO 12100 risk assessment). TypeB (generic safety standards, e.g., EN ISO 13849-1, EN IEC 62061). Type-C (machine-specific safety standards, e.g., EN 415 packaging).
Risk assessment per ISO 12100: Hazard identification + risk estimation + risk evaluation + risk reduction measure (inherent safe design + safeguarding + complementary + information for use). Iterative process.
PL/SIL cross-mapping: SIL 1 = PL b. SIL 2 = PL c. SIL 3 = PL d. SIL 3 = PL e (high DC required). Mapping approximate.
Common B2B mistakes: (1) Using only ISO 13849-1 without IEC 62061 for SIL-based architecture. (2) Missing CCF score documentation. (3) Missing T10D documentation. (4) Missing Category 4 fault accumulation analysis. (5) Missing EU Machinery Regulation transition.
B2B recommendation: For machinery case, choose PL-based (ISO 13849-1) or SIL-based (IEC 62061) per application + EU Machinery Regulation (EU) 2023/1230 compliance + ISO 12100 risk assessment + EN ISO 13849-1 + EN IEC 62061 + EN ISO 13849-2 validation.
B2B Procurement Workflow + Machinery Case Design
Machinery case procurement per EU Machinery Regulation + ISO 13849-1 + IEC 62061 + Type-C standards.
B2B procurement workflow: (1) Identify machinery type + applicable Type-C standard. (2) Risk assessment per ISO 12100. (3) Determine PL or SIL per safety function. (4) Choose ISO 13849-1 PL-based or IEC 62061 SIL-based architecture. (5) Select Category per PL (Category 1 / 2 / 3 / 4). (6) Calculate PFHd + verify against PL target. (7) Document DC + CCF + T10D. (8) Validate per ISO 13849-2. (9) EU Machinery Regulation compliance + CE marking.
Type-C examples: EN 415 (packaging machinery), EN 528 (stacker cranes), EN 60204-1 (electrical equipment of machines), EN 1010 (printing machines), EN ISO 10218 (robots), EN 14502 (cranes), EN ISO 11111 (textile machines).
Functional safety engineer per ISO 13849-1 § 4.1.1: Person with relevant competence + experience + training. CFSE / TUV FSE / equivalent. Required for SRP/CS design.
Test lab / certifying body: TUV SUD / TUV NORD / TUV Rheinland / DEKRA / UL / SGS / Intertek. EU Notified Body for Machinery Regulation compliance.
Cost: ISO 13849-1 PL d/e certification EUR 30,000-100,000. IEC 62061 SIL 2/3 EUR 30,000-80,000. EU Machinery Regulation conformity assessment EUR 20,000-50,000.
Duration: 6-12 months typical for full certification.
Protective case requirements for machinery control equipment: (1) IP rating per IEC 60529 + EN ISO 13849-1 environmental requirements. (2) Vibration per ISO 13849-1 § 4.3. (3) Temperature per ISO 13849-1 § 4.3. (4) EMC per IEC 62061 + IEC 61000-6-7 (functional safety). (5) Tamper-evident design for safety components.
Case material: Must not compromise safety function. Non-flammable per IEC 60695-11-10. UV-resistant for outdoor. Chemical-resistant per operating environment.
E-Stop + safety switches + interlocks: Accessible from outside case. Per EN ISO 13850 (E-Stop). EN ISO 14119 (interlocks).
B2B recommendation: For machinery protective cases, identify Type-C standard + ISO 12100 risk assessment + ISO 13849-1 PL or IEC 62061 SIL + EU Machinery Regulation compliance + E-Stop accessibility + IP + EMC + tamper-evident + T10D documentation.
Puntos clave
- ISO 13849-1:2023 Edition 4 is global machinery safety standard. PL a-e. Companion IEC 62061:2022 SIL-based. Required for EU Machinery Regulation (EU) 2023/1230 compliance.
- Categories B/1/2/3/4 structural architecture. PL a/b = categories B/1. PL c = 1/2/3. PL d = 3. PL e = 4 with high DC.
- PL determination: Severity x Frequency x Possibility of Avoidance. PFHd ranges PL a 10^-5 to PL e 10^-8. T10D mission time 20 years typical.
- Diagnostic coverage (DC) + Common cause failure (CCF) required for Category 3/4. DCavg >= 90% for PL d. CCF score >= 65 for PL d/e.
- EU Machinery Regulation (EU) 2023/1230 replaces Directive 2006/42/EC. Effective 20 January 2027. New scope: AI + IoT + cybersecurity.
- B2B recommendation: For machinery case, identify Type-C standard + ISO 12100 risk assessment + ISO 13849-1 PL or IEC 62061 SIL + EU Machinery Regulation + E-Stop + IP + EMC + tamper-evident + T10D.
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