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 items

Info

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
Application number
ZA881754A
Inventor
Gronemeyer Michael
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of ZA881754B publication Critical patent/ZA881754B/en

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)
  • Safety Devices In Control Systems (AREA)
  • Hardware Redundancy (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>
ZA881754A 1987-03-12 1988-03-11 A safety switching circuit comprising a plurality of microcomputers which process the same data items ZA881754B (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
DK133188A (en) 1988-09-13
DK170451B1 (en) 1995-09-04
EP0281890B1 (en) 1994-07-13
EP0281890A3 (en) 1990-08-01
EP0281890A2 (en) 1988-09-14
ES2056070T3 (en) 1994-10-01
ATE108570T1 (en) 1994-07-15
DK133188D0 (en) 1988-03-11
DE3708055A1 (en) 1988-09-22
DE3850591D1 (en) 1994-08-18

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