As S7-300/400 series PLC(Programmable Logic Controller) is node controller based on field bus net,it is difficult to develop the communication software on Lab Windows/CVI platform for its privacy of communication protocol.
After analysis on comparison of IEC 61850 technical protocol and existing communication protocols,along with the introduction of the existing communication system structure in the substation of Shijiazhuang Power Grid,this paper concludes that the generalization of IEC 61850 is development trend of substation′s automation system of Shijiazhuang Power Grid,and presents two transitional plans.
(4) Bring up a distributed Direct Torque Control system based on SERCOS bus, SERCOS stand for Serial Real Time Communication System agreement which is most in keeping with synchronous with moderate motor control;
(4) 提出了基于SERCOS总线网络化分布式的直接转矩控制系统，SERCOS (Serial Real Time Communication System)是目前最适合同步和协调控制的串行实时通信协议；
Main technology correlating with this system has research and programming of Proc file system, research and programming of XML relevant technology, FTP protocol research of agreement with how is it apply to collection system , programming thought of many thread.
In the software respect, the SCM procedures of data acquiring module and USB data transmission module are designed in C language, USB51S function library of PHILIPS is adopted to explain USB data transmission agreement in the procedure of USB interface SCM.
As to the application protocol, this device chooses the ASDU (Application Service Data Unit) of IEC 60870-5-103 together with TCP protocol as the protocol used in traction substation, chooses IEC 60870-5-104 protocol as the protocol used between traction substation and remote control center.
In addition, the thesis includes the study of the operation system and interface character of IC card and the protocol of T=0(the asynchronous half duplex transmission protocol of character), and realizes the data exchange between IC card and power meter.
Towardmaster communicate with termination stations, on the bases of record or non-recorddata and IEC60870-5-103 protocol, combinate the ASDU in IEC60870-5-104protocol and TCP/IP to solve the shortage of transmission protocol at present. Itdiscusses the regulation about physics, link, and application layer of the protocol.
However, whatever method is used, real industrial applications need to establish well-defined and widely accepted protocols for validating the models and defining their robustness, prediction power and applicability domain.
They can both reduce latency and save energy in the wireless sensor network (WSN) while most others propose protocols that sacrifice latency for energy.
It is found that the size and interval of the data frame, utilization of the link background and protocols of higher layer are key factors of real-time performance.
In this paper, we briefly introduce the basic concepts and protocols of continuous variable quantum communication, and then summarize the experimental researches accomplished by our group in this field.
The one-party quantum error correction codes are especially designed for quantum dense coding and related QSDC protocols based on dense coding.
The study shows that government has made some important changes after the signing of WTO agreement in 1994, but there are still some contentious issues that require attention.
Finally, we applied the model for prediction of a promising new BABQ compound expected to be highly active, and it is seen that our model is in good agreement with the hypothesis in terms of in vitro and in vivo activities.
Analytical results for two batches of compound ibuprofen tablets by the SEKI-based FI-CE approach were in good agreement with that obtained by a conventional high performance liquid chromatographic method.
The order of magnitude for the thermal expansion coefficient, a, calculated by the theoretical model is in good agreement with experimental value.
The characteristics of the sample chip are in agreement with the theoretical predictions.
According to the protocol of the National Cancer Institute (NCI) in vitro disease-oriented human cells screening panel assay, 13 compounds showed promising broad spectrum antitumor activity.
The protocol is founded on time division multiplex address and a different type of traffic is assigned to different priority, according to which a node should compete for and reserve the free slots in a different method.
The protocol, which was obtained by combining the ElGamal encryption scheme with the ElGamal signature scheme, is efficient and simple.
The protocol is proven secure against passive attack by using indistinguishable method.
Because the protocol is based on the broadcast channel, it is also suitable for key agreement in wireless communications, especially in ad-hoc networks.