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.

RX3i communications features include:
▪ Open communications support includes Ethernet, PROFIBUS, PROFINET, Modbus TCP,
Ethernet Global Data (EGD), DNP3 and serial protocols.
▪ On the CPL410. the Ethernet Port and Serial Port located on the underside and one of the
USB ports are controlled by the Linux Operating System; all front-panel ports are controlled by
the RX3i PLC, except for the one USB port mentioned above.
▪ On the CPE400. one of its embedded Ethernet ports is set up as a dedicated Field Agent
port.
▪ The CPE302. CPE30511. CPE310. and CPE330. CPE400 and CPL410 CPUs provide an
embedded Ethernet interface which is used to connect to the programmer (PAC Machine
Edition).
▪ Effective with RX3i CPE310/CPE305 firmware version 7.30. or CPE330 firmware version
8.50. the embedded Ethernet port on the CPU provides support for Service Request Transfer
Protocol (SRTP) channels and for Modbus TCP. This feature is available on all firmware versions of
CPE400 and CPL410.
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