RX3i supports hot standby (HSB) CPU redundancy, which allows a critical application or process to
continue operating if a failure occurs in any single component. A CPU redundancy system consists of
an active unit that actively controls the process and a backup unit that is synchronized with the active
unit and can take over the process if it becomes necessary. Each unit must have a redundancy CPU
(See section 2.2 for CPUs that support redundancy). For the backplane-based CPU redundancy, the
redundancy communication path is provided by IC695RMX128 Redundancy Memory Xchange (RMX)
modules set up as redundancy links. For the Ethernet-based CPU redundancy, the redundancy
communication path is provided by Ethernet connections between the redundant CPUs.
For details on the operation of PACSystems redundancy systems, refer to the PACSystems Hot Standby CPU
Redundancy User Manual, GFK-2308.
The EIOC is a big pipe for the integration of process data from
3rd party Ethernet Devices, such as PLCs and smart field devices
such as Intelligent Field Devices (IFDs) and Intelligent Electronic
Devices (IEDs). A network of these Ethernet Devices can be
directly connected to the EIOC. The Ethernet Devices can
communicate to the EIOC using one of five protocols;
Modbus TCP, EtherNet/IP, IEC61850 MMS, OPC UA client
and EtherNet/IP Control Tag Integration. The EIOC connects
directly into the DeltaV Control Network and can be placed
remotely in an enclosure in the field.
The EIOC is an independent embedded data server. This means
that there is no need for a separate controller to process the
data being integrated into the EIOC. Control Modules needed
to process the data from the Ethernet Devices are assigned and
executed in the EIOC. In this way, communications with the
devices are fast and direct. Any parameters from the modules
running in the EIOC can be read by both S-series and M-series
controllers using External References when needed in control
strategies at the controller level.
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