GE T35 Instruction Manual page 92

5.2 PRODUCT SETUP
The T35 supports the Distributed Network Protocol (DNP) version 3.0. The T35 can be used as a DNP slave device con-
nected to a single DNP master (usually an RTU or a SCADA master station). Since the T35 maintains one set of DNP data
change buffers and connection information, only one DNP master should actively communicate with the T35 at one time.
The setting selects the communications port assigned to the DNP protocol; only a single port can be assigned.
DNP PORT
Once DNP is assigned to a serial port, the Modbus protocol is disabled on that port. Note that COM1 can be used only in
non-ethernet UR relays. When this setting is set to "Network", the DNP protocol can be used over either TCP/IP or UDP/IP.
Refer to Appendix E for more information on the DNP protocol. The
number identifies the T35 on a DNP communications link. Each DNP slave should be assigned a unique address. The
NETWORK CLIENT ADDRESS
The
DNP UNSOL RESPONSE FUNCTION
mechanism. The
DNP UNSOL RESPONSE TIMEOUT
response. The
DNP UNSOL RESPONSE MAX RETRIES
ited response without receiving confirmation from the master; a value of "255" allows infinite re-tries. The
RESPONSE DEST ADDRESS
ited responses are sent is determined by the T35 from the current TCP connection or the most recent UDP message.
The
USER MAP FOR DNP ANALOGS
5
smaller Modbus User Map. This can be useful for users wishing to read only selected Analog Input points from the T35.
See Appendix E for more information.
The
NUMBER OF SOURCES IN ANALOG LIST
are included in the Analog Inputs points list. This allows the list to be customized to contain data for only the sources that
are configured. This setting is relevant only when the User Map is not used.
The
DNP SCALE FACTOR
log Input data into types: current, voltage, power, energy, and other. Each setting represents the scale factor for all Analog
Input points of that type. For example, if the
Input points that are voltages will be returned with values 1000 times smaller (e.g. a value of 72000 V on the T35 will be
returned as 72). These settings are useful when analog input values must be adjusted to fit within certain ranges in DNP
masters. Note that a scale factor of 0.1 is equivalent to a multiplier of 10 (i.e. the value will be 10 times larger).
The
DNP DEFAULT DEADBAND
settings group the T35 Analog Input data into types: current, voltage, power, energy, and other. Each setting represents the
default deadband value for all Analog Input points of that type. For example, to trigger unsolicited responses from the T35
when any current values change by 15 A, the
these settings are the deadband default values. DNP Object 34 points can be used to change deadband values, from the
default, for each individual DNP Analog Input point. Whenever power is removed and re-applied to the T35, the default
deadbands will be in effect.
The
DNP TIME SYNC IIN PERIOD
Changing this time allows the DNP master to send time synchronization commands more or less often, as required.
The
DNP MESSAGE FRAGMENT SIZE
fragment sizes allow for more efficient throughput; smaller fragment sizes cause more application layer confirmations to be
necessary which can provide for more robust data transfer over noisy communication channels.
The
DNP BINARY INPUTS USER MAP
Binary Inputs list contains 928 points representing various binary states (contact inputs and outputs, virtual inputs and out-
puts, protection element states, etc.). If not all of these points are required in the DNP master, a custom Binary Inputs points
list can be created by selecting up to 58 blocks of 16 points. Each block represents 16 binary input points. Block 1 repre-
sents binary input points 0 to 15, block 2 represents binary input points 16 to 31, block 3 represents binary input points 32
to 47, etc. The minimum number of binary input points that can be selected is 16 (1 block). If all of the
settings are set to "Not Used", the standard list of 928 points will be in effect. The T35 will form the binary inputs points list
from the
BIN INPUT BLOCK X
5-14
DNP TIME SYNC IIN
MESSAGE
PERIOD: 1440 min
DNP MESSAGE FRAGMENT
MESSAGE
SIZE: 240
# DNP BINARY INPUTS
MESSAGE
# USER MAP
setting can force the T35 to respond to a maximum of five specific DNP masters.
should be "Disabled" for RS485 applications since there is no collision avoidance
sets the time the T35 waits for a DNP master to confirm an unsolicited
setting determines the number of times the T35 retransmits an unsolic-
is the DNP address to which all unsolicited responses are sent. The IP address to which unsolic-
setting allows the large pre-defined Analog Inputs points list to be replaced by the much
setting allows the selection of the number of current/voltage source values that
settings are numbers used to scale Analog Input point values. These settings group the T35 Ana-
DNP VOLTAGE SCALE FACTOR
settings determine when to trigger unsolicited responses containing Analog Input data. These
DNP CURRENT DEFAULT DEADBAND
setting determines how often the Need Time Internal Indication (IIN) bit is set by the T35.
setting determines the size, in bytes, at which message fragmentation occurs. Large
setting allows for the creation of a custom DNP Binary Inputs points list. The default DNP
settings up to the first occurrence of a setting value of "Not Used".
T35 Transformer Management Relay
Range: 1 to 10080 min. in steps of 1
Range: 30 to 2048 in steps of 1
setting is the DNP slave address. This
DNP ADDRESS
setting is set to a value of 1000, all DNP Analog
setting should be set to "15". Note that
5 SETTINGS
DNP
DNP UNSOL
BIN INPUT BLOCK X
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