Iec 60870-5-104 - GE 889 Instruction Manual

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IEC 60870-5-104

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4–40
ANALOG INPUTS
It is important to note that 16-bit and 32-bit variations of analog inputs are transmitted
through DNP as signed numbers. Even for analog input points that are not valid as
negative values, the maximum positive representation is 32767 for 16-bit values and
2147483647 for 32-bit values. This is a DNP requirement. The deadbands for all Analog
Input points are in the same units as the Analog Input quantity. For example, an Analog
Input quantity measured in volts has a corresponding deadband in units of volts. Relay
settings are available to set default deadband values according to data type. Deadbands
for individual Analog Input Points can be set using DNP Object 34.
1. A default variation refers to the variation response when variation 0 is requested and/
or in class 0, 1, 2, or 3 scans. The default variations for object types 1, 2, 20, 21, 22, 23,
30, and 32 are selected via relay settings. This optimizes the class 0 poll data size.
2. For static (non-change-event) objects, qualifiers 17 or 28 are only responded when a
request is sent with qualifiers 17 or 28, respectively. Otherwise, static object requests
sent with qualifiers 00, 01, 06, 07, or 08, are responded with qualifiers 00 or 01. For
change event objects, qualifiers 17 or 28 are always responded.
Cold restarts are implemented the same as warm restarts – the 889 is not restarted, but
the DNP process is restarted.
The IEC 60870-5-104 communications protocol is supported on Ethernet ports 4 and 5
only. Setting changes become active after rebooting.
In 889 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 use the same data
mapping, i.e., same point index and same point source.
The 889 supports up to two IEC104 client connections simultaneously.
Path:
Setpoints > Device > Communications > IEC 60870-5-104
Channel 1 Port
Channel 2 Port
Common Address of ASDU
Client Address 1
Client Address 2
TCP Port Number 1
TCP Port Number 2
Cyclic Data Period
Object Info Addrs Bnry
Object Info Addrs Analog
Object Info Addrs Countrs
Object Info Addrs Cmnd
Object Info Analog Param
By default the Object Information Address for the different data is as follows:
M_SP (Single Points) = 1000
M_ME (Measured value) = 2000
M_IT (Integrated Totals) = 3000
C_SC or C_DC (Single or Double Command) = 4000
P_ME_NB (Parameter of measured value) = 5000
Each Measured value has a Parameter of measured value (P_ME_NB) associated to its
threshold.
889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS