US4355390A
Expired / Lapsed
US
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Method for checking data written into buffered write-read memories in numerically controlled machine tools
Assignee: Siemens AG
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Filing: 1980-09-22
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Granted: 1982-10-19
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Expires: 2000-09-22
Abstract
Abstract A method for checking stored data in numerically controlled machine tools with buffered write-read memories is disclosed. The longitudinal sums of associated data are formed in individual write-read memories and are written into a supplementary buffer memory. When the system is switched-on or at periodic intervals, the longitudinal sums of the data are formed and compared with the stored longitudinal sums. In the event of deviations, the affected data block is indicated.
Inventors
- 👤 Friedrich-Wilhelm Hellwig
- 👤 Werner Schrei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:24
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/08; G06F11/10; G06F11/1008; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/406; G06F11/1076
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
109 words
A method for checking data written into a buffered write-read memory in a control apparatus for a numerically controlled machine tool, comprising supplying buffered power to the write-read memory independently of the power supplied to the control apparatus so as to enable the write-read memory to store data for an extended period of time, forming longitudinal sums of associated data each time there is a change in the associated data, writing the longitudinal sums into the buffered write-read memory, reforming the longitudinal sums each time power is supplied to the control apparatus, comparing the formed and reformed longitudinal sums, and indicating the affected data if there is a deviation.
Claim 2
Independent Claim
109 words
A method for checking data written into a buffered write-read memory in a control apparatus for a numerically controlled machine tool, comprising supplying buffered power to the write-read memory independently of the power supplied to the control apparatus so as to enable the write-read memory to store data for an extended period of time, forming longitudinal sums of associated data each time there is a change in the associated data, writing the longitudinal sums into the buffered write-read memory, reforming the longitudinal sums each time power is supplied to the control apparatus, comparing the formed and reformed longitudinal sums, and indicating the affected data if there is a deviation.
Claim 3
Dependent Claim
33 words
The method according to claim 1 and including the steps of reforming the longitudinal sums periodically, comparing the formed and periodically reformed sums and indicating the affected data if there is a deviation.
References Cited (Backward Citations)
US3838264A
Cited
US4142243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-18 | 1986-04-19 | 1986-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-18 | 1990-04-19 | 1990-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-18 | 1994-04-19 | 1994-10-19 | $7700.00 | Window Closed / Lapsed |