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Standby Controller
Standby Controller
Designing the System
Redundant automation solutions can be achieved with various network topologies.
Physically separating the management network (SCADA systems) and the network for the remote I/Os is recommended. We also recom-
mend setting up the remote I/O network in a ring structure using fibre-optic network components. This significantly increases the perfor-
mance, security and, above all, the network availability and thus the system reliability. Standard devices from third-party providers can
be used for the network components (switches). We have had good experiences with the switches (RS30) from Hirschmann. However,
the networks can also be set up with standard components in a star structure. A shared physical network for the remote I/Os and manage-
ment systems is also possible, but availability of the system will be reduced accordingly.
Network redundancy
with fiber optical ring
Shared physical network in a star topology with standard components
Recommended network topology with physically separate
networks and a fibre-optic ring
Physically separate networks in a star topology with standard
components
Secondary
Primary
Secondary
Primary
Secondary
Primary
Process I/O
Process I/O
Process I/O
Process I/O
SCADA system
Ethernet
Standby Controllers
PCD3.M6880
Smart RIOs
PCD3.T668
SCADA 1
SCADA 2
SCADA system
Ethernet
Ethernet
Standby Controllers
PCD3.M6880
SCADA 1
SCADA 2
Smart RIOs
PCD3.T668
SCADA system
Ethernet
Standby CPUs
PCD3.M6880
Standby CPUs
PCD3.M6880
SCADA 1
SCADA 2
Smart RIOs
PCD3.T668
Process I/O
Process I/O
