Method and system for changing safety-relevant data for a control device
US8700914B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 2007 |
| Grant date | Apr 15, 2014 |
| Priority date | — |
| Expiry date | Jul 23, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/25068
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system and method for changing safety-relevant data for a control device is provided wherein an authorized user inputs new or altered safety-relevant data, which is received on a data processing installation. A first checksum for the safety-relevant data is established and stored along with the safety-relevant data in at least one data record on the data processing installation. An enable code may also be stored in the at least one data record. This enable code may be produced by a code generator and encrypted by a key module. The data processing installation then reads back the safety-relevant data from a memory in the data processing installation, thereby allowing a comparison of the received safety-relevant data and the read back safety-relevant data. A second checksum is generated in a case where the comparison resulted in no differences. The second checksum may also be stored in the at least one data record. At least one new data record containing the safety-relevant data, the encrypted enable code and the first and second checksums is created and transmitted to the control device. The new data record is checked against prior data records and prior checksums stored on a stor…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.