D02706R02.30
L-PRO 4000 User Manual
5-1
5 Data Communications
5.1 Introduction
Section 5 deals with data communications with the relay. First, the SCADA
protocol is discussed, and it is then followed by the new IEC 61850 communi-
cation standard.
The SCADA protocol deals with the Modbus and DNP (Distributed Network
Protocol) protocols. The SCADA configuration and its settings are described.
The parameters for SCADA communications are defined using L-PRO 4000
Offliner software. Finally, details on how to monitor SCADA communications
are given for maintenance and trouble shooting of the relay.
5.2 SCADA Protocol
Modbus
Protocol
The relay supports either a Modbus RTU or Modbus ASCII SCADA connec-
tion. Modbus is available exclusively via a direct serial link. Serial Modbus
communications can be utilized exclusively via serial Port 122 are an RS-232
DCE DB9F port located on the back of the relay. An external RS-232 to RS-
485 converter can be used to connect the relay to an RS-485 network. For de-
tails on connecting to serial Port, see “Communicating with the Relay Intelli-
gent Electronic Device (IED)” on page 2-2 and “Communication Port Details”
on page 2-15.
The data points available for Modbus SCADA interface are fixed and are not
selectable by the user. Complete details regarding the Modbus protocol emu-
lation and data point lists can be found in “Modbus RTU Communication Pro-
tocol” in Appendix E.
DNP Protocol
The relay supports a DNP3 (Level 2) SCADA connection. DNP3 is available
via a direct serial link or an Ethernet LAN connection using either TCP or
UDP.
Serial DNP communications can be utilized exclusively via serial Port 122.
Port 122 is an RS-232 DCE DB9F port located on the back of the relay. An ex-
ternal RS-232 to RS-485 converter can be used to connect the relay to an RS-
485 network. For details on connecting to serial Port, see “Communicating
with the Relay Intelligent Electronic Device (IED)” on page 2-2 and “Commu-
nication Port Details” on page 2-15.
Network DNP communications can be utilized via physical LAN Port 119 or
Port 120. Port 119 is available as a RJ-45 port on the front of the relay and as
an RJ-45 or ST fiber optic port on the rear. Port 120 located on the rear of the
relay is available as an RJ-45 or ST fiber optic port. DNP communications can
be used with multiple masters when it is utilized with TCP. For details on con-
necting to the Ethernet LAN, see “Network Link” on page 2-5.
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