A protection system and method for preventing PLC controller from crashing
A technology for protecting systems and controllers, applied in general control systems, control/regulating systems, and program control in sequence/logic controllers, etc., can solve the problem of inability to determine the program stops running and the location of the fault, and achieves the purpose of preventing crashes. Effect
Active Publication Date: 2019-03-29
富伦特流体工业设备(大连)有限公司
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Problems solved by technology
However, it is impossible to judge which programs inside the PLC stop running and where the fault is
Method used
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[0014] The present invention will be further described below in conjunction with accompanying drawing.
[0015] Such as figure 1 As shown, a protection system for preventing PLC controllers from crashing, including PLC controllers, frequency relays, ordinary relays 1, 2, 3, unit safety chains and unit off-grid circuits, and the frequency relay is provided with a contactor 1 , 2, 3, the output terminals of the contactors 1, 2, 3 are respectively connected to the input terminals of ordinary relays 1, 2, 3, and the output terminals of ordinary relays 1, 2, 3 are respectively connected to the safety chain of the unit and the off-grid circuit of the unit , the safety chain of the unit is connected with the pitch control system, the off-grid circuit of the unit is respectively connected with the main inverter system and the stator circuit breaker, and a digital output point is set on the I / O module of the PLC controller itself , and design a small program to control the frequency p...
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The invention relates to the technical field of power electrical application, and discloses a protecting system and method for preventing a PLC from dead halt. The system comprises the PLC, a frequency relay, an ordinary relay 1, an ordinary relay 2, an ordinary relay 3, a set safety chain and a set off-grid and on-grid circuit. The method includes the following steps of firstly, designing a small program; secondly, dividing the program into three executing tasks according to control content; thirdly, judging faults. Compared with the prior art, the system and method have the advantages that a digital amount output point is set on an I / O module of the PLC, the small program is designed and used for controlling the frequency pulse output of the digital amount output point, the output frequency of the point can be determined according to the frequency of the selected frequency relay, the frequency relay is connected to the safety chain of a wind turbine set and connected to a grid and other hardware links in series through the ordinary relays, when the output frequency of the digital amount output point is not in a normal range, contacts of the ordinary relays are tripped off, the set safety chain disconnecting, off-grid, feathering and other safety halt movements are ensured, and the positions of the faults of the system can be rapidly detected.
Description
technical field [0001] The invention relates to a protection system and a method thereof for preventing a PLC controller from crashing, and belongs to the technical field of power electronics applications. Background technique [0002] The automatic control system of wind turbine generally adopts the programmable logic controller as the core controller to complete the relevant control actions (hereinafter referred to as the programmable logic controller is PLC). As the core control of the entire control system, PLC is mainly responsible for data collection and control command sending, logic operation, data recording and other related functions. The PLC controller not only controls the operation and stop of various peripheral equipment, but also sends pitch, yaw and main inverter control commands through communication. The performance of the wind turbine automatic control system is related to the operation status of the entire unit. Once the software or hardware of the PLC c...
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IPC IPC(8): G05B19/05
CPCG05B19/058G05B2219/14114
Inventor 马靖聪张洪阳刘红牟秀玉樊文辉
Owner 富伦特流体工业设备(大连)有限公司