Controller time synchronizing method of industrial control system
An industrial control system and time synchronization technology, applied in the direction of comprehensive factory control, comprehensive factory control, electrical program control, etc., can solve the problem that the signal reception is greatly affected by the environment, the stability of time synchronization is low, the synchronization accuracy is low, and the stability of GPS signals is affected. problems, to achieve the effect of convenient networking, low cost of use, and avoiding the influence of external factors
Inactive Publication Date: 2015-05-06
CHONGQING CHUANYI AUTOMATION
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[0002] In the industrial control system, multiple controllers are required to control the industrial process. In order to ensure the accuracy of the control, it is necessary to synchronize the time of each controller in the industrial control system. The existing time synchronization mainly includes GPS time synchronization or NTP protocol time synchronization and other methods, but there are following disadvantages in the prior art: although GPS time synchronization can achieve accurate timing and accurate synchronization, the reception of its signal is greatly affected by the environment. Therefore, GPS time synchronization is based on signal stability. Based on the basis, but the current electromagnetic environment interference and other environmental factors can seriously affect the stability of the GPS signal; and the NTP protocol time synchronization is easy to network, but the stability and synchronization accuracy of the NTP protocol time synchronization are low
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[0019] figure 1 Be the flow chart of the present invention, figure 2 It is a connection schematic diagram of the controller of the present invention, as shown in the figure,
[0020] A controller time synchronization method of an industrial control system provided by the present invention comprises the following steps:
[0021] S1. Each controller in the industrial control system is connected through two signal lines, one of which is a pulse signal line, and the other is a synchronous time information communication line. The pulse signal line is connected to the controller through the GPIO interface, and the synchronous time information communication line is connected to the The communication port of the controller is connected, wherein the synchronous time information communication line is connected to the communication port of the controller through an interface such as RS485, that is to say, the synchronous pulse signal is sent through the pulse signal line, and the synch...
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The invention provides a controller time synchronizing method of an industrial control system. The controller time synchronizing method of the industrial control system comprises the following steps that a time synchronization reference source sends synchronization pulse to a node controller and meanwhile transmits synchronization time information; while receiving the synchronization pulse, the node controller triggers a synchronization timer of the node controller; when receiving the synchronization time information, the node controller takes the sum of the timing time of the timer and the synchronization time in the synchronization time information as the calibration time for time synchronization calibration. Therefore, the controller time synchronizing method of the industrial control system can facilitate networking and effectively avoid influence of environmental factors, and meanwhile can effectively ensure time synchronization precision and working stability.
Description
technical field [0001] The invention relates to a time synchronization method, in particular to a time synchronization method for a controller of an industrial control system. Background technique [0002] In the industrial control system, multiple controllers are required to control the industrial process. In order to ensure the accuracy of the control, it is necessary to synchronize the time of each controller in the industrial control system. The existing time synchronization mainly includes GPS time synchronization or NTP protocol time synchronization and other methods, but there are following disadvantages in the prior art: although GPS time synchronization can achieve accurate timing and accurate synchronization, the reception of its signal is greatly affected by the environment. Therefore, GPS time synchronization is based on signal stability. On the basis, but the current environmental factors such as electromagnetic environment interference can seriously affect the ...
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IPC IPC(8): G05B19/418
CPCY02P90/02G05B19/418
Inventor 裴文龙裘宏波刘渝新程海栗
Owner CHONGQING CHUANYI AUTOMATION
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