GE L90 Instruction Manual page 156

5.2 PRODUCT SETUP
5
The L90 supports the Distributed Network Protocol (DNP) version 3.0. The L90 can be used as a DNP slave device con-
nected to multiple DNP masters (usually an RTU or a SCADA master station). Since the L90 maintains two sets of DNP
data change buffers and connection information, two DNP masters can actively communicate with the L90 at one time.
The IEC 60870-5-104 and DNP protocols cannot be used simultaneously. When the IEC 60870-5-104 FUNCTION
setting is set to "Enabled", the DNP protocol is not operational. When this setting is changed it does not become
NOTE active until power to the relay has been cycled (off-to-on).
The DNP Channels sub-menu is shown below.

PATH: SETTINGS PRODUCT SETUP
 DNP CHANNELS

The
DNP CHANNEL 1 PORT
for each channel. Once DNP is assigned to a serial port, the Modbus protocol is disabled on that port. When this setting is
set to "Network - TCP", the DNP protocol can be used over TCP/IP on channels 1 or 2. When this value is set to "Network -
UDP", the DNP protocol can be used over UDP/IP on channel 1 only. Refer to Appendix E for additional information on the
DNP protocol.
Changes to the DNP CHANNEL 1 PORT and DNP CHANNEL 2 PORT settings take effect only after power has
been cycled to the relay.
NOTE
The
DNP NETWORK CLIENT ADDRESS
settings in this sub-menu are shown below.
5-26
DNP MESSAGE FRAGMENT
MESSAGE
SIZE: 240
DNP OBJECT 1
MESSAGE
DEFAULT VARIATION: 2
DNP OBJECT 2
MESSAGE
DEFAULT VARIATION: 2
DNP OBJECT 20
MESSAGE
DEFAULT VARIATION: 1
DNP OBJECT 21
MESSAGE
DEFAULT VARIATION: 1
DNP OBJECT 22
MESSAGE
DEFAULT VARIATION: 1
DNP OBJECT 23
MESSAGE
DEFAULT VARIATION: 2
DNP OBJECT 30
MESSAGE
DEFAULT VARIATION: 1
DNP OBJECT 32
MESSAGE
DEFAULT VARIATION: 1
DNP NUMBER OF PAIRED
MESSAGE
CONTROL POINTS: 0
DNP TCP CONNECTION
MESSAGE
TIMEOUT: 120 s

COMMUNICATIONS
DNP CHANNEL 1 PORT:
NETWORK
DNP CHANNEL 2 PORT:
MESSAGE
COM2 - RS485
and
DNP CHANNEL 2 PORT
settings can force the L90 to respond to a maximum of five specific DNP masters. The
L90 Line Current Differential System
Range: 30 to 2048 in steps of 1
Range: 1, 2
Range: 1, 2
Range: 1, 2, 5, 6
Range: 1, 2, 9, 10
Range: 1, 2, 5, 6
Range: 1, 2, 5, 6
Range: 1, 2, 3, 4, 5
Range: 1, 2, 3, 4, 5, 7
Range: 0 to 32 in steps of 1
Range: 10 to 300 s in steps of 1
 
DNP PROTOCOL DNP CHANNELS
Range: NONE, COM2 - RS485,
FRONT PANEL - RS232, NETWORK - TCP,
NETWORK - UDP
Range: NONE, COM2 - RS485,
FRONT PANEL - RS232, NETWORK - TCP,
NETWORK - UDP
settings select the communications port assigned to the DNP protocol
5 SETTINGS
GE Multilin