7SG12 DAD-N Communication Interface
1 Introduction
All Reyrolle relays utilise the International Communications Standard for Protection Relays, IEC 60870-5-103.
This document describes how to connect the IEC60870-5-103 compliant communications interface to a control
system or interrogating computer.
To access the interface the user will need appropriate software within the control system or on the
interrogating computer such as Reydisp Evolution.
The Reyrolle Argus 1 to Argus 8 range of protection relays have a single rear communications interface. The
Reyrolle Modular II relay range which includes Ohmega, Delta, Duobias, Iota, Tau and MicroTaPP have two
rear communications interfaces COM1 & COM2. COM2 is multiplexed with an RS232 port mounted upon the
Fascia :-
1. COM1: this port is used for IEC60870-5-103 communications to a substation SCADA or integrated control
system by default.
2. COM2: this port can also be used for IEC60870-5-103 communications to a substation SCADA or
integrated control system. Note however that only one port can be mapped to the IEC60870-5-103
protocol at any one time. (The COMMS INTERFACE submenu includes a setting “IEC60870 on port”,
which maps the protocol to either COM1 or COM2). COM2 can also be accessed through an isolated
RS232 (female 25-pin D-type) connector on the relay fascia. This provides facilities for access to the relay
from a laptop or PC when commissioning or interrogating relays. A “COM2 Direction” setting is available
which, when set to “AUTO-DETECT” automatically allows the front port to take control away from the rear
port when a computer is plugged into the D-type connector.
2 Reydisp Evolution
Reydisp Evolution is a PC based software package providing capability for both local and remote
communication to all Reyrolle Protection Relays . It provides features such as download of disturbance and
event records, upload of relay settings, real-time monitoring of measurands and remote control of plant.
Reydisp Evolution can be configured to connect to the relays using RS232, Fibre Optic, Modem or using
Ethernet. When Ethernet is used the IEC 60870-5-103 protocol is transported using the TCP/IP protocol suite
across a Local or Wide Area Network (LAN/WAN).
3 Connection Specification and Relay Settings
This section defines the connection medium as defined by IEC60870-5-103. Appendix A shows some typical
communication connections.
3.1 Recommended cable
Two types of fibre-optic connectors are available with Reyrolle relays:
1.
Fibres terminated with 9mm SMA connectors. With this type of connector the recommended cable is
62.5 / 125
μ
m glass fibre. This will allow a maximum transmission distance of 1.7km between Reyrolle
relays. It will also be the maximum distance between the ring network and the fibre to RS232
converter.
Alternatively, 1.0mm polymer cable may be used to reduce cost. This will provide transmission distances
of up to 5m between relays. Note that the distance from the transmit output of the RS232 / fibre optic
converter to the receive input of the first Reyrolle relay should not be more than 6m.
2.
Fibres terminated with BFOC/2.5 (ST
®
) bayonet-style connectors. With this type of connector the
recommended cable is also 62.5 / 125
μ
m glass fibre. This offers superior performance over the SMA
connectors in terms of better coupling to the fibre and therefore has lower losses.
No other types of cable are suitable for use with Reyrolle relays.
3.2 Connection Method
Reyrolle relays can be connected in either a Star or Ring fibre-optic communications network. If star
connected then a passive fibre optic hub must be used. A lower cost option is the ring configuration where
the Reyrolle relays are ‘daisy chained.’ That is, the transmit output of the first relay is connected to the
receive input of the second relay, and so on until the ring is complete.
Communication to the ring may be achieved either locally in the substation or remotely via the Public
Switched Telephone Network (PSTN). If remote communication is desired, then additional modem
equipment must be installed.
©2010 Siemens Protection Devices Limited
Chapter 4 Page 3 of 10
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