ABB 500NMD20 User Manual

System concept Network structures
3.2.6 Network structure: Line with redundant route via mobile
connection
Eth
Station 1
RTU
Station 2
Eth
RTU
2
Station 3
Eth
RTU
2
1
Cu
Eth
Eth
Eth
Station 4
RTU
1
Eth
Eth
Cu
Cu
Control station
Control
system
VPN tunnel
Internet
Mobil radio
modem
Mobil radio
modem
Figure 6: Example for network structure: Line with
redundant route via mobile connection
Legend:
1 500NMD01
2 500NMD02
The monitoring function of the EDS500 devices allows to monitor the network to the central
office. Failure of the primary connection (here: VPN tunnel through the internet) makes the
EDS500 device in station 4 to start a dial-in connection via the mobile network as secondary
connection. Placing the dial-in spots at the end of a line leads not only to a line protection
when the VPN tunnels is lost, but also for any loss of connection between the stations 1 to 4.
3.3 Functions overview
3.3.1 Remote control protocols and protocol integration
As EDS500 devices support TCP/IP based protocols like IEC 60870-5-104 as well as the
established RS-232 based serial protocols like IEC 60870-5-101 it is possible to transport
these (and other) protocols in the same network simultaneously. This mixed operation allows
to modernize existing SCADA networks step by step with the future-proof IP technology.
Numerous established serial protocols can be transported with this method among others
IEC 60870-5-101, Modbus, RP570/571, SEAB-1F and many more.
Using serial tunnelling improves existing serial networks with the advantages of packet
oriented IP networks: protection with redundant connections (rings, backup connections),
control and monitoring as well astransmission via modern DSL connections or optical
connections.
The devices support native IEC 60870-5-101 and IEC 60870-5-104 which cuts them out for the
future oriented, step-by-step expansion during the network modernization: The integrated
conversion function from IEC 60870-5-101 to IEC 60870-5-104 and back allows the use
of a modern IEC-104 based central office and switching the network to packet oriented
IP transmission technology while the existing IEC-101-RTUs can still be used due to the
conversion function. The transmission technology would already exist if these RTUs shall be
replaced with modern IEC 60870-5-104 devices.
Due to the integrated IEC 60870-5-104 support of EDS500 devices the communications
technology can be monitored directly from a IEC 60870-5-104 central office.
1KGT150966 V0001 15

ABB 500NMD20 Specifications

General

Brand	ABB
Model	500NMD20
Category	Network Router
Language	English