Dnp Communication - GE Multilin 850 Communications Manual

CHAPTER 4: DNP PROTOCOL

DNP communication

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8 SERIES PROTECTIVE RELAY PLATFORM – COMMUNICATIONS GUIDE
The 8 Series relay supports Distributed Network Protocol (DNP) version 3.0. and the
8 Series relay operates as a DNP slave device. Two DNP masters can actively
communicate with the 8 Series relay at one time as the 8 Series relay maintains two sets
of DNP data change buffers and connection information. The following is a detailed
explanation of the 8 Series relay 's DNP 3 implementation.
Both DNP and IEC104 protocol can work at the same time, but the user has to consider
that there is only one point map. So, the two protocols will use the same data mapping, i.e.
the same point index and same point source.
The 8 Series relay supports two DNP3.0 client connections simultaneously.
When configuring DNP do not use port 20057 since it is reserved for internal purposes by
the unit itself.
Figure 4-1: DNP Data Types
DATA TYPES
Binary input data: Binary input data is used to monitor two-state device operations
such as the position of a circuit breaker. The user can configure up to 96 Binary inputs.
All binary inputs are configured from FlexLogic operands. For a complete list, see
Format Code FC142.
Binary output data: Binary output data is used to control two-state devices such as
the tripping or circuit closing of a circuit breaker. The 8 Series relay can be configured
to support up to 16 Binary outputs. The slave's Binary outputs are automatically
mapped into the 8 Series relay virtual inputs starting at virtual input 1. Please note
that the number of Binary/ Control outputs is configurable. The user can configure a
subset that supports dual point control. This subset starts at address 0.
Analog input data: Analog input data is used to monitor analog signals such as
voltages, currents, and power. Up to 32 analog points can be mapped to the master.
Analog output data: Not supported in the 8 Series relay .
Time stamps
Count input data: Count input data could represent a cumulative quantity such as
kilowatt-hours of energy. Up to 16 counter points can be mapped to the master.
DNP COMMUNICATION
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