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ID : 2669
Safety Performance of Safety-Related Control System
This section describes the safety performance of the safety-related control systems in the following subsection.
- Safety Performance of Respective Safety-Related Control Systems
- Conditions of Safety Performance Calculation
Safety Performance of Respective Safety-Related Control Systems
Safety Performance of Emergency Stop Function and Protective Stop Function
The followings are calculated under the worst condition.
| Safety Function | MTTFd | DCavg | Category | PFHd | PL |
|---|---|---|---|---|---|
| SS1-t | 100.0 years | 60% | 3 | 1.0 × 10-7 | d |
| STO | |||||
| SOC |
Safety Performance of Speed Limit Function
The followings are calculated under the worst condition.
| Safety Function | MTTFd | DCavg | Category | PFHd | PL |
|---|---|---|---|---|---|
| SLS | 51.4 years | 60% | 3 | 2.9 × 10-7 | d |
| STO | 46.3 years | 3.8 × 10-7 | |||
| SOC | 100.0 years | 1.0 × 10-7 |
Safety Performance of Torque Limit Function
The followings are calculated under the worst condition.
| Safety Function | MTTFd | DCavg | Category | PFHd | PL |
|---|---|---|---|---|---|
| SLT | 100.0 years | 60% | 3 | 1.0 × 10-7 | d |
| STO | 46.3 years | 3.8 × 10-7 | |||
| SOC | 100.0 years | 1.0 × 10-7 |
Safety Performance of Axis Limit Function
The followings are calculated under the worst condition.
| Safety Function | MTTFd | DCavg | Category | PFHd | PL |
|---|---|---|---|---|---|
| SAL | 51.4 years | 60% | 3 | 2.9 × 10-7 | d |
| STO | 46.3 years | 3.8 × 10-7 | |||
| SOC | 100.0 years | 1.0 × 10-7 |
Conditions of Safety Performance Calculation
The calculation of the above safety performance is based on ISO 13849-1:2015.
Expected operation counts a year (Nop) are as follows.
| Operation | Mission time (year) | |
|---|---|---|
| 10 | 20 | |
| To stop COBOTTA from the safety-related control system while COBOTTA is in motion. | 20,683 | 19,466 |
ID : 2669