With the development of social industry, new energy power, aerospace transportation and other aspects, all industries have higher requirements for the accuracy of equipment. In order to solve the time synchronization problem of each clock in the network, the prior art provides a variety of protocols that can support network clock synchronization, such as Network Time Protocol (NTP); Simple Network Time Protocol (SNTP) and so on. However, the disadvantage of these protocols supporting network clock synchronization is that the accuracy of clock synchronization is not high enough, usually in the millisecond level, which can not meet the application needs of modern industrial control, such as power industry, new energy, machinery, transportation and other industries.
In order to solve the above problems, it is proposed to establish a network accurate clock synchronization committee, which is composed of engineers and technicians in the fields of information technology, automatic control, artificial intelligence, test and measurement, and formulates the standard of accurate clock synchronization protocol for network measurement and control system (IEEE 1588 standard). The Precision Time Synchronization Protocol (PTP) of IEEE 1588 is used for sub-microsecond synchronization of clocks in terminal devices such as sensors and actuators in standard Ethernet or other distributed bus systems using multicast technology, which achieves good network clock synchronization accuracy and significantly improves the timing synchronization index of the network.
PTP clock mainly realizes the functions of master clock and slave clock, but a PTP communication subnet can only have one master clock. In the process of system synchronization, PTP master clock provides time synchronization and time information, and receives time stamp information sent by master clock from the clock. According to this information, the system calculates the time delay and slave time difference of the master-slave line, and adjusts the local time by using the time difference to keep the equipment time in the same frequency and phase with the master equipment time, thus realizing frequency synchronization and time synchronization.
This paper mainly introduces an industrial slave clock module produced by Xi 'an Company, which is mainly used in industrial automation system, aerospace system, energy, transportation, base station, digital substation, telecom room, private network communication and other fields. The equipment has wide application, high timing accuracy, small volume, low power consumption and easy integration.
PTP slave clock is also called extended clock in engineering application, which can receive time synchronization signals sent by two master clocks at the same time. The equipment has an internal time reference, and it is a device that outputs time synchronization signals and time information according to the required time accuracy.
PTP time service is mainly used in laboratories, measurement and control systems, industrial automation and power systems, etc., which require high time synchronization accuracy and meet the requirements of sub-fine level. For example, TD-SCDMA system for civil mobile communication clock, remote control and telemetry system for missile launch in military communication, and ship radar system.
SYN2407F industrial-grade IEEE 1588 slave clock module is a PTP industrial-grade precision timing slave module developed and produced by Xi 'an. The slave clock module can be used as an accurate time synchronization system together with PTP master equipment and ordinary switches. Using master-slave clock mode, time information can be encoded without special switch 1588. Master-slave time-frequency phase synchronization can be realized by using network symmetry and delay measurement technology. In the synchronization process of the system, the module receives the time stamp information sent by the master clock port, and the system calculates the time delay and master-slave time difference of the master-slave line according to it, and uses this time difference to adjust the local time so that the slave time is consistent with the master time.
This PTP slave clock module can analyze the IEEE 1588 network precise time protocol from the network, recover the time information and 1PPS, and the accuracy can reach 30 nanoseconds (RMS). The PTP slave clock module can configure corresponding parameters by using serial port or network port UDP, provide serial port and 1PPS as time reference signals, provide P2P and E2E modes, 10M/ 100M adaptive network port, support PTPv2, IEEE STD 1588v2-2008 network timing protocol, and support. The equipment has the function of giving instructions to dynamically compensate the accuracy of 1PPS; It has the function of searching IP and configuring network parameters through UDP network; It has the function of web page configuration and saving PTP network parameters.
Users don't need to know the specific protocol of IEEE STD 1588V2. The software and hardware design of this module is neutral, which is easy to be embedded in user equipment and realizes PTP high-precision time service. It is a PTP slave clock module with convenient use, low cost and high integration.
Operation of PTP module
Before the equipment is powered on, check whether the power supply of the module and various signal connections are correct; When connecting, it should be noted that the grounding of the module must be closely connected with the grounding of the input or output equipment. It is recommended that the customer make a good motherboard and insert the module directly into the motherboard, and be careful not to have large overshoot input when using it. Pay attention to anti-static, anti-fouling, anti-falling, anti-liquid immersion when using; Insert the module into the completed motherboard when powering on, and check whether it is inserted correctly; If the power supply is normal when the module is started, the power supply indicator is always on; Configure PTP module and master-slave timing through network connection computer.
Configuration is divided into three configuration modes, including network port configuration, UDP configuration and web page configuration.
Network port configuration
The module has a configuration network port. The default factory configuration of this module is PTP slave clock. Open the browser on the management computer, enter the initial IP address of PTP slave clock module in the address bar, and finally click Enter to enter the login home page. After that, it will automatically jump to the configuration login page interface, enter the user name and password, and finally click Enter to enter the configuration.
UDP configuration
Open the information provided by our company after purchase, and open and run PTP configuration software on the computer; Click "Search Device", select the PTP slave clock connected in the network, select the device, click Ordinary User, enter the user password, and finally double-click the selected device to open it. Even if the corresponding configuration information is displayed on the right, users can modify the IP address and device name according to their own needs, and click Save and then click Device Restart to take effect.
Our entrepreneurial team are all technical engineers who have been engaged in instrument research and development for decades. Through the identification of national high-tech enterprises, it has dozens of patents and software copyrights, and is a comprehensive enterprise that has mastered electronic measurement technology and time-frequency core technology. There are many scientific and technological talents, which have great advantages over the salary and rent in first-tier cities. Manage all aspects of product development, production and sales with internet thinking, and optimize the cost performance of products to the extreme.