Abstract
According to the basic machinery safety standard ISO 13849-1, the capability of a machine control system to perform a safety function is expressed using performance levels (PL). This paper brings out some challenges in the process of evaluating performance levels for safety related machine control functions. One of these examines the use of different cabling schemes in the implementation of a safety function and its effect on the PL evaluation. The challenges are highlighted using a generic example of a safety function relating to a mobile work machine where different technologies (electrical, hydraulic and pneumatic) can be utilized. A safety stop function with different structures was used as an example in PL calculations. Analogue cables in mobile work machines can cause a remarkable risk, since they are vulnerable to disturbances and failures. A part of these failures may be difficult to detect. In this study it was detected that by replacing analogue cabling with digital communications the reachable PL can be increased.
| Original language | English |
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| Title of host publication | Proceedings of the 7th International Conference on the Safety of Industrial Automated Systems |
| Subtitle of host publication | SIAS 2012 |
| Place of Publication | Montreal |
| Publisher | IRSST |
| Pages | 121-126 |
| ISBN (Print) | 978-2-89631-635-9 |
| Publication status | Published - 2012 |
| MoE publication type | B3 Non-refereed article in conference proceedings |
| Event | 7th International Conference on the Safety of Industrial Automated Systems, SIAS 2012 - Montreal, Canada Duration: 11 Oct 2012 → 12 Oct 2012 |
Conference
| Conference | 7th International Conference on the Safety of Industrial Automated Systems, SIAS 2012 |
|---|---|
| Abbreviated title | SIAS 2012 |
| Country | Canada |
| City | Montreal |
| Period | 11/10/12 → 12/10/12 |
Keywords
- Machines
- control function
- safety