ZA881754B - A safety switching circuit comprising a plurality of microcomputers which process the same data items - Google Patents
A safety switching circuit comprising a plurality of microcomputers which process the same data itemsInfo
- Publication number
- ZA881754B ZA881754B ZA881754A ZA881754A ZA881754B ZA 881754 B ZA881754 B ZA 881754B ZA 881754 A ZA881754 A ZA 881754A ZA 881754 A ZA881754 A ZA 881754A ZA 881754 B ZA881754 B ZA 881754B
- Authority
- ZA
- South Africa
- Prior art keywords
- output
- microcomputer
- gate
- safety switching
- comparators
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/1629—Error detection by comparing the output of redundant processing systems
- G06F11/1641—Error detection by comparing the output of redundant processing systems where the comparison is not performed by the redundant processing components
- G06F11/1645—Error detection by comparing the output of redundant processing systems where the comparison is not performed by the redundant processing components and the comparison itself uses redundant hardware
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
- G06F11/2205—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested
- G06F11/2215—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested to test error correction or detection circuits
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/0796—Safety measures, i.e. ensuring safe condition in the event of error, e.g. for controlling element
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Hardware Redundancy (AREA)
- Safety Devices In Control Systems (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Train Traffic Observation, Control, And Security (AREA)
- Air Bags (AREA)
Abstract
Multi-channel safety switching devices require comparators for data to be output to the process so that a signal divergence can be recognised in time and possibly false information items can be kept away from the process. This requires a data-flow-independent checking of the comparators. A release signal (FG1) to be output by the comparator (VG1) when the microcomputer (MR1, MR2) to be monitored is operating correctly is output indirectly via an AND gate (UD1) to output signal converters (AR). A test circuit (TSG1) which has a bistable characteristic is connected to the AND gate (UD1). The test circuit evaluates a key information item (SN1) output by the microcomputer (MR1), which counts as acknowledgement of a predetermined computer routine of the microcomputer (MR1). In dependence on this, an enable code is output for the AND gate (UD1). The abovementioned safety switching devices can be used, in particular, in the case of process controls with safety responsibility, for example in the case of railway signalling. <IMAGE>
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873708055 DE3708055A1 (en) | 1987-03-12 | 1987-03-12 | SAFETY SWITCHGEAR WITH MULTIPLE MICROCOMPUERS PROCESSING THE SAME DATA |
Publications (1)
Publication Number | Publication Date |
---|---|
ZA881754B true ZA881754B (en) | 1988-08-31 |
Family
ID=6322923
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ZA881754A ZA881754B (en) | 1987-03-12 | 1988-03-11 | A safety switching circuit comprising a plurality of microcomputers which process the same data items |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0281890B1 (en) |
AT (1) | ATE108570T1 (en) |
DE (2) | DE3708055A1 (en) |
DK (1) | DK170451B1 (en) |
ES (1) | ES2056070T3 (en) |
ZA (1) | ZA881754B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10332557A1 (en) | 2003-07-11 | 2005-02-17 | Siemens Ag | Method and computer system for operating a security system |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2217634C3 (en) * | 1972-04-12 | 1974-08-29 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Safety circuit for counting pulses according to the binary number system in digital data processing systems, especially in railway systems |
DE3003291C2 (en) * | 1980-01-30 | 1983-02-24 | Siemens AG, 1000 Berlin und 8000 München | Two-channel data processing arrangement for railway safety purposes |
DE3137450C2 (en) * | 1981-09-21 | 1984-03-22 | Siemens AG, 1000 Berlin und 8000 München | Safety output circuit for a data processing system |
DE3332802A1 (en) * | 1983-09-12 | 1985-03-28 | Siemens AG, 1000 Berlin und 8000 München | CIRCUIT ARRANGEMENT FOR CHECKING THE CORRECT STARTING OF A TWO-CHANNEL FAIL-SAFE MICROCOMPUTER SWITCHGEAR, ESPECIALLY FOR RAILWAY LOCKING SYSTEMS |
-
1987
- 1987-03-12 DE DE19873708055 patent/DE3708055A1/en not_active Withdrawn
-
1988
- 1988-02-29 AT AT88103025T patent/ATE108570T1/en not_active IP Right Cessation
- 1988-02-29 EP EP88103025A patent/EP0281890B1/en not_active Expired - Lifetime
- 1988-02-29 DE DE3850591T patent/DE3850591D1/en not_active Expired - Fee Related
- 1988-02-29 ES ES88103025T patent/ES2056070T3/en not_active Expired - Lifetime
- 1988-03-11 DK DK133188A patent/DK170451B1/en not_active IP Right Cessation
- 1988-03-11 ZA ZA881754A patent/ZA881754B/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP0281890A3 (en) | 1990-08-01 |
EP0281890A2 (en) | 1988-09-14 |
DK133188D0 (en) | 1988-03-11 |
EP0281890B1 (en) | 1994-07-13 |
DE3850591D1 (en) | 1994-08-18 |
DK170451B1 (en) | 1995-09-04 |
DE3708055A1 (en) | 1988-09-22 |
ATE108570T1 (en) | 1994-07-15 |
DK133188A (en) | 1988-09-13 |
ES2056070T3 (en) | 1994-10-01 |
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