After compensation, the accuracy of calibrated frequency is better than 5×10(-12)/30min, frequency stability is better than 3×10(-12)/30min,and time uncertainty is less than 100us in the region near the main station;
And making use of the Simense S7-300 as the host station of the flexible manufacturing system,and building the FMS communication and control system based on the Profibus-DP field bus,which ensure the real-time communication between the units and equipment cells in the FMS.
Along with the development of mobile communication technique, mobile GPRS (General Package Radio Service) platform can realize IP connection anywhere and end to end wireless transparent transmission, so that it can provide convenient solution for electric power system existing long-distance connection of intelligent terminal with host station.
The on-the-spot bus technology is an important component of computer long-ranging control, its main function is that through the main website of the bus and from the control of the station, pass the transmission of RS-485 serial communication interface, controls the operation state of the on-the-spot apparatus.
This paper has studied the overview of the on-the-spot bus, the kinds of principal and subordinate station, among them PROFIBUS bus is used more, for PROFIBUS bus, this paper researches the structure form of main website, the interface classification of the subordinate station, PROFIBUS bus communication agreement, and PROFIBUS bus'connection with automated system.
This paper has studied the overview of the on - the - spot bus, the kinds of principal and subordinate station, among them PROFIBUS bus is used more, for PROFIBUS bus, this paper researches the structure form of main website, the interface classfication of the subordinate station, FROFIBUS bus communication agreement, and PROFIBUS bus'connection with automated system.
A main station with a 100-m mast is situated at the NE urban/rural border.
In addition to the main station, the project comprises: measurements from two 14-m masts, one on the top of a centrally located building, the other mobile; pilot balloon ascents; tethered balloon soundings, car-borne temperature traverses etc.
A two-year study (1977/78 and 1978/79) was carried out using GT I seedlings raised in polybags at the Rubber Research Institute of Nigeria (RRIN) main station, to determine the response of rubber seedlings to the application of N, P, K fertilizer.
According to the system's specification, a battery must be used to provide adequate power to operate the main station.
Alternatively, the main station of Heidelberg is only 1 km away from the city centre and is connected with the most important European cities.