Error state control method of PLC system
A technology of error state and control method, applied in the direction of program control, electrical program control, general control system, etc., can solve the problems of cost increase and maintenance requiring a lot of time, and achieve the effect of reducing time, frequency and cost
Pending Publication Date: 2022-04-19
LS电气株式会社
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Problems solved by technology
[0029] In the past, the central processing unit of the PLC responded to the fault diagnosis signals of all external equipment, so if the fault diagnosis signal was input, it entered the error mode, so the operation status of the PLC stopped very frequently, and the user had to manually cancel the error mode in order to reset , so there is a problem that it takes a lot of time for maintenance and increases the cost
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[0050] In order to fully understand the structure and effects of the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below, but may be implemented in various forms, and various changes may be made. However, the description of this embodiment is intended to provide a complete disclosure of the present invention and fully disclose the scope of the present invention to those having ordinary skill in the art to which the present invention pertains. In the drawings, the size of constituent elements is exaggerated for convenience of description, and the ratio of each constituent element may be exaggerated or reduced.
[0051] The terms "first", "second", etc. may be used to describe various constituent elements, but these constituent elements should not be limited to the above terms. The above terms may be used only to distingui...
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The present invention relates to an error state control method for a PLC system, comprising: a) a step of creating an error event task that can be executed in a central processing unit of the PLC system and that opens, closes or blocks a signal of an external module by using a control program executed in a computer for setting the PLC system, and storing the error event task in a memory of the PLC system; b) executing the program stored in the memory in stages by a central processing unit of the PLC system; c) a step of confirming, by the central processing device, whether a signal notifying the occurrence of an error is received from the external module; and d) a step of preventing the central processing device from operating in an error mode by executing an error event task in the event that a signal notifying the occurrence of an error is received in the step c).
Description
technical field [0001] The invention relates to an error state control method of a PLC system, more specifically, relates to an error state control method of a PLC system capable of minimizing debugging processing. Background technique [0002] Usually, PLC (Programmable Logic Controller) is mainly used in the non-contact sequential control circuit system for factory automation, and the control system is formed by connecting elements such as relays, timers, and counters, or in non-contact sequence control systems that can change the program. Used in contact sequence control. [0003] The advantages of PLC are that it is fast, resistant to the environment, easy to operate, economical, and includes multiple control elements, capable of programmable real-time combined control, rather than a simple sequential controller. [0004] Generally, a PLC includes: an input circuit, connected to a plurality of sensors; an output circuit, connected to a control object such as a motor; an...
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Login to View More IPC IPC(8): G05B19/05
CPCG05B19/058G05B2219/1179G05B2219/14097
Inventor 朴昶佑
Owner LS电气株式会社