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saia-pcd.com
Standby Controller
Standby Controller
5
Switch cabinet
components
4
Consumer
data acquisition
3
Dedicated
room controllers
2
Operation
and monitoring
1
Automation
stations
Redundant control solutions are created using two PCD3.M6880 Standby Controllers. The input/outputs (process signals) are con-
nected and controlled via PCD3.T668 Ethernet smart RIOs. The RIO stations are connected to both controllers via an Ethernet con-
nection. This means there is no need to have duplicate inputs, outputs, sensors and actuators. The two PCDs (primary and second-
ary) monitor each other. If the active PCD fails, the standby PCD takes over processing and control of the connected RIO stations.
The process image (I/O) and the internal PCD media (F, R, T, C, DB) - the synchronization data - are continuously transferred from the
active PCD to the standby PCD via the Ethernet connection. This ensures uninterrupted switching from the active to the standby
PCD.
Ordering Information
PCD3.M6880
Modular PCD3 standby controller with 2 Ethernet TCP/IP ports and a coprocessor for standby operation.
PCD3.T668
Smart RIO for standby system, for connection to the PCD3.M6880 CPU1.
The Redundant CPU1 has two independent Ethernet interfaces. The ETH 2.x inter-
face is reserved exclusively for operating the PCD3.T668 RIO stations. The PCDs also
synchronize their process data via the same interface. For security reasons, we rec-
ommend setting up this network as a ring structure with specific network compo-
nents from third-party providers. We have had good experiences with the industrial
Ethernet switches from Hirschmann.
The ETH 1 interface on CPU0 is available for connecting and operating other sys-
tems and devices. For example, SCADA systems can be connected via this interface.
SBC does not provide its own SCADA system for redundant automation solutions,
but almost any system can be used. A single SCADA system, or an additional
redundant SCADA system can be used if it supports redundant controllers.
The PCD3. M6880 controllers provide detailed status and diagnostic information
which can be evaluated by the SCADA systems.
Ethernet 2
(2 port switch)
Ethernet 1
