GE 845 Instruction Manual page 142

DEVICE
DNP 3
FASTPATH:
FASTPATH:
FASTPATH:
4–38
The 845 supports Distributed Network Protocol (DNP) version 3.0. and the 845 operates as
a DNP slave device. Two DNP masters can actively communicate with the 845 at one time
as the 845 maintains two sets of DNP data change buffers and connection information.
The following is a detailed explanation of the 845 '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 845 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 4-11: 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.
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 845 can be configured to support
up to 16 Binary outputs. The slave's Binary outputs are automatically mapped into the
845 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 845 .
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.
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS