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safety control system

A technology of safety control and safety data, applied in general control systems, control/regulation systems, program control, etc., can solve the problems of mixed existence of safety functions and non-safety functions, easy occurrence of synchronization failure, etc., to reduce the number of processor units , high reliability and low cost

Inactive Publication Date: 2011-12-07
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

Method used

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Embodiment Construction

[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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Abstract

The invention provides a safety control system, which aims to reduce the number of processor units so as to realize the low cost and small occupation space. Meanwhile, the safety function of a dual-structure can be reliably realized. The safety control system comprises a first processor unit for performing the control function and the safety function, and a second processor unit for only performing the safety function. The first processor unit comprises a safe data transmission module and a safe data execution module. When the communication data contains the safe data, the safe data transmission module generates an internal interruption signal and an external interruption signal sent to the second processor unit. Meanwhile, the safe data are sent to the second processor unit by the safe data transmission module.

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...

Claims

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Application Information

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IPC IPC(8): G05B9/03
CPCG05B9/03G05B2219/24191H02M3/157G06F11/0796G06F11/1633G06F11/1654G06F11/1687
Inventor 国分博之佐藤以久也
Owner FUJI ELECTRIC CO LTD
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