Safety control method and system for communication interruption between upper computer and lower computer

Abstract

The invention discloses a safety control method and a safety control system for communication interruption of an upper computer and a lower computer. The safety control method comprises the steps that the lower computer sends a life digital signal to the upper computer; the upper computer does not process the received life digital signal and instantly feeds back to the lower computer; the lower computer receives the signal fed back by the upper computer and judges whether the received signal and the sent life digital signal are same; if the received signal and the sent life digital signal are same, communication is normal; if the received signal and the sent life digital signal are not same or the signal fed back by the upper computer is not received, communication is abnormal; the lower computer outputs a switching value to switch off a main power supply or key equipment. According to the invention, the lower computer used as the leading sends the life digital signal to the upper computer to detect communication connection between the upper computer and the lower computer; when the upper computer fails, the lower computer automatically switches off operation of the main power supply or the key equipment; dependence on operation of operators and the like is not necessary any longer; the timeliness and the safety of the control system are ensured; simultaneously, operators are free from worry, with time saving and labor saving.

Description

technical field [0001] The invention relates to the field of industrial control, in particular to a safety control method and system for communication interruption between an upper computer and a lower computer. Background technique [0002] In the field of industrial control, the most commonly used control architecture is the control architecture of the upper computer plus the lower computer. The upper computer generally uses an easy-to-operate and powerful industrial computer or tablet computer, which is mainly used for the operation and management of the control system. The lower computer generally selects a stable and reliable programmable logic controller (ProgrammableLogicController, referred to as PLC) as the core controller of the control system. like figure 1 As shown, the two are connected through PROFIBUS bus or Ethernet (EtherNET) or other buses. [0003] In such a control system, the PLC as the lower computer is famous for its stability and reliability. As lo...

AI Technical Summary

Problems solved by technology

[0005] However, the failure of the upper computer is a sudden failure, which is unforeseen

When the upper computer fails, the operator only needs to press the emergency stop button or re-login the control software to restore the control of the system, so there are too many human factors, such as the absence of the operator or slow response may cause equipment accidents or endanger personal life Safety

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