Output control system applied on safe computer

Abstract

The invention discloses an output control system applied on a safe computer. The output control system comprises a double-coil relay which is provided with a coil A and a coil B. The coil A and the coil B parallelly drive the double-coil relay so that the double-coil relay outputs a signal which is required for driving external equipment. The output control system is furthermore provided with an output control A-series unit and an output control B-series unit which simultaneously output and respectively drive the coil A and the coil B, and a main / standby module which selects one from the output control A-series unit and the output control B-series unit as a main / standby series and performs feedback of a result to the output control A-series unit and the output control B-series unit. The output control system has advantages of greatly improving system reliability, increasing a state detecting mechanism and an alarm mechanism of the relay, and facilitating fault eliminating and maintenance.

Description

technical field [0001] The invention relates to the field of industrial control, in particular to an output control system applied to a safety computer. Background technique [0002] In the field of industrial control, especially in the field of safety-related industrial control, the core control unit - the safety computer control system has high reliability and safety requirements. In addition to the selection of high-reliability electronic components, all kinds of safe and reliable The advanced computer control technology and method are also widely used in computer control systems. As one of the key technologies of safety computer control system, output control technology has a great influence on the safety and reliability of the whole safety computer control system. extremely important influence. [0003] At present, the electromagnetic relay control circuit is generally used in the industry to achieve safe output control. The electromagnetic relay is an electronic contr...

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Problems solved by technology

[0005] Single electromagnetic relay control circuit has low reliability

In the field of industrial control, in addition to the high requirements for the safety of the equipment used, the reliability of the equipment is also an extremely important indicator, which is limited by factors such as purchase cost and equipment volume, although we have tried our best when designing the computer control system. Choose devices with high reliability, but often the final selected relay and its output control circuit cannot fully meet the reliability design requirements of the system, especially in some safety-critical fields, such as rail transit, aerospace, Military, etc., the system will use many means or auxiliary equipment to ensure the safety of the system. The increase in the complexity of the system will directly lead to a decrease in reliability, so there will be higher requirements for reliability design. If a single electromagnetic relay is still used to control circuit, which will make it the reliability bottleneck of the entire system

[0006] In addition, the electromagnetic relay itself also has a large energy consumption.

In the field of industrial control, as mentioned above, in order to ensure the safety of the output and reduce the difficulty of control, the electromagnetic relay control circuit is mostly used to realize the output control, and the general industrial control system is a large industrial equipment or a large integrated system, and its own system is relatively large. And the number of interfaces is large, which increases the number of relays used, and the energy consumption generated by driving the relays will become quite large. In some cases, it may become a bottleneck and a huge burden on the energy consumption of the entire system, greatly increasing the entire system. The difficulty of system design and the implementation and operation cost of the whole system

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