IEC 60870 5 104 is the network access of IEC 60870 5 101. Due to the short time of promulgation and the use of network programming, manufacturers and users do not have a deep understanding of the protocol, and there are not many practical applications. Combined with the specific practice of Zhejiang Quzhou Electric Power Bureau, this paper introduces the basic concepts of IEC 60870 5 104 standard and explains several issues that should be paid attention to when applying it. Keywords: IEC 60870 5 104; dispatching automation system; telecontrol protocol; TCP/IP protocol protocol is a set of management rules for how to assemble data and information messages at the information source, transmit them through the network, and disassemble and assemble the messages at the destination. In order to achieve the standardization of telecontrol protocol, the International Electrotechnical Commission TC 57 Technical Committee has formulated a series of basic standards for telecontrol protocol, and on this basis, formulated the IEC 608705 101 telecontrol protocol. my country has formulated the corresponding supporting standard DL/T634 on the basis of non-equivalent adoption of this protocol. 1997, and revised in 2002, equivalent to the adoption of international standards.
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