ICP DAS USA DNP-211, Руководство пользователя

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Version 1.0.1
DNP-211 User Manual
2022/06/01
1. Introduction
1.1. DNP3 Introduction
DNP3 (Distributed Network Protocol 3) is a communication protocol used
between automation components. The protocol is formulated with
reference to IEC 870-5. The purpose is to unify the communication
method of SCADA so that SCADA can use the DNP3 protocol to
communicate with master stations, remote terminal units (RTUs),
intelligent electronic devices (IEDs), etc., and are mainly used in utilities
such as electric and water companies.
The DNP3 protocol has certain of reliability and allows reliable
communications in the adverse environments that electric utility
automation systems are subjected to being specifically designed to
overcome distortion induced by electromagnetic interference (EMI),
aging components, and poor transmission media. A large number of CRC
check codes are used in the protocol to ensure the accuracy of data. It is
suitable for high security, Data communication field of medium speed and
medium amount of data.
1.2. Modbus TCP Introduction
Modbus TCP is a variant of the Modbus family of simple, vendor-neutral
communication protocols intended for supervision and control of
automation equipment. Specifically, it covers the use of Modbus
messaging in an “Intranet” or “Internet” environment using the
TCP/IP protocols. The most common use of the protocols at this time is
for Ethernet attachment of PLC’s, I/O modules, and gateways to other
simple field buses or I/O networks.