Security control system
A security control and security data technology, applied in general control systems, control/regulation systems, program control, etc., can solve the problems of easy synchronization failure, mixed safety functions and non-safety functions, etc., to achieve high reliability and reduce The number of processor units and the effect of cost reduction
Inactive Publication Date: 2013-09-25
FUJI ELECTRIC CO LTD
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Problems solved by technology
[0006] However, when such a unit structure is formed, there are problems due to the mixed presence of safety functions and non-safety functions
For example, the dual safety function needs to be synchronized in order to perform the same safety process at the same time, but there is a problem that the safety process of a processor unit is affected by the behavior of the non-safety process, and synchronization failure is likely to occur
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[0058] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 It is a configuration diagram of the safety control system 1 and peripheral devices according to the embodiment of the present invention. with such Figure 9 The main difference of the shown existing safety control system 1 is that the processor unit 11 having both the control function and the safety function by integrating the functions of the processor unit 90 and the processor unit 91, and the processor unit 11 having only the safety function Structure composed of processor unit 12. The respective processor units 11, 12, the communication device 10, and the power converter 60 are connected by cables. In addition, between the processor unit 11 and the processor unit 12, an external interrupt signal line is used for connection as a data synchronization method.
[0059] In this configuration, a non-safety signal is output from processor unit 11 to power conve...
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A safety control system allows the number of processor units to be reduced to achieve cost and space reduction, while completely maintaining synchronization between safety functions in a dual-mode configuration. The safety control system includes a first processor unit 11 that performs both of a control function and a safety function and a second processor unit 12 that performs only a safety function. The first processor unit 11 includes a safety data transfer device 26 for, when communication data includes safety data, generating an internal interruption signal and an external interruption signal to the second processor unit 12, and transferring the safety data to the second processor unit 12, and a safety data execution 27 device for executing safety processing by the internal interruption signal. The second processor unit 12 starts up with the external interruption signal and executes safety processing based on the safety data transferred from the first processor unit 11.
Description
technical field [0001] The present invention relates to a safety control system, which has a safety monitoring function of a controlled device such as a power converter, and controls the controlled device based on a control signal provided via a network. High-precision synchronization processing is performed between processors with only safety monitoring functions to realize a high-safety safety control system. Background technique [0002] At present, functional safety requirements are put forward for controlled devices such as power converters, and functional safety standards represented by IEC61508 have been formulated. In this functional safety standard, in addition to the diagnosis and monitoring functions, a function of converting a device to a safe state based on a signal from an external sensor or the like is defined. The function of transitioning to the safe state includes safe stop, safe deceleration, and the like. In addition, as a method of giving control signa...
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IPC IPC(8): G05B9/03
CPCG05B2219/24191H02M3/157G05B9/03G06F11/0796G06F11/1633G06F11/1654G06F11/1687
Inventor 国分博之佐藤以久也
Owner FUJI ELECTRIC CO LTD