Security system
AssigneeJokab Safety AB
InventorsMats Linger, Goran Svensson
Life of this patent
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Abstract
The present invention relates to a programmable safety system intended to be used for safety functions, in which a fault in a control circuit does not lead to a safety function being disabled, which system comprises monitoring functions containing at least two control units, input terminals separately coupled to both control units, whereby each control unit executes its own instruction set and continuously compares a result from the execution with each other. At least one control unit can access the in and output terminal status of a second control unit and/or a number of flags, and the control units are arranged to monitor the result of respectively executed instruction sets and control that the results of the executions are substantially equivalent.
Claims27
A programmable safety system intended to be used for safety functions, in which a fault in a control circuit does not lead to a safety function being disabled which system comprises monitoring functions containing at least two control units, inputs separately coupled to both the control units, whereby each control unit executes its own instruction set and continuously compares a result from the execution with each other, characterized in
- that at least one control unit can access the status of the input and output terminal of a second control unit and/or a number of flags and that the control units are arranged to monitor the result of respectively executed instruction sets and to control that the results of the executions are substantially equivalent.
A method in a programmable safety system intended to be used for safety functions, in which a fault in a control circuit does not lead to a safety function being disabled which system comprises monitored functions containing at least two control units, input terminals separately coupled to both control units, whereby each control unit executes its own instruction set and continuously compares a result from the execution with each other, characterized in
- that at least the in- and output terminal status of a second control unit and/or a number of flags are made available for a control unit, and that the control units are arranged to supervise the result of each respectively executed instruction set and to control that the results of the executions are substantially equivalent
Dependencies are inferred from the claim text.