Figure 13: Lan3 Interconnects For Hot Standby Redundancy - GE PACSystems RX7i Reference Manual

Hot Standby Redundancy
With firmware version 9.30 or later, it is possible to configure the CPE400 as a Hot Standby Redundancy
CPU with PROFINET IO. The two ports on LAN3 are used exclusively for this purpose: they provide a high-
speed data synchronization link between the two CPUs. Connect the upper LAN3 port of the Primary
CPU to the upper LAN3 port of the Secondary CPU and connect the lower LAN3 port of the Primary to
the lower LAN3 port of the Secondary, as shown in Figure 13. Note that no additional hardware, other
than the two redundant CPUs, may be connected to LAN3.

Figure 13: LAN3 Interconnects for Hot Standby Redundancy

To enable redundancy in a CPE400 project, select the CPE400 target in the PME Navigator and use the
Property Inspector to change the Enable Redundancy target property to True.
Important: Set the Background Window Timer to a minimum of 5ms in both the Primary and Backup
CPE400 hardware configurations. The Background Window Timer setting may be found on the Scan Tab
in the CPE400's hardware configuration.
Once configured for HSB Redundancy, the RACT and RBOK LEDs (Figure 2) become functional.
•
RACT indicates the Local CPU is Ready & Active;
•
RBOK indicates the Remote CPU is Ready.
These two LEDs are also reflected in the Status Data of the CPU and are presented as OPC UA Variables.
The OLED display includes two menu items used in conjunction with Redundancy:
•
RDN Info provides status information via the OLED display.
•
RDN Command permits the operator to perform a Role Switch.
To support Hot Standby operations, LAN2 is configured as a PROFINET IO Controller. For additional
details, refer to Section 2.1.6, Embedded PROFINET Controller.
For further details, refer to the PACSystems Hot Standby CPU Redundancy User Manual, GFK-2308 (rev
L or later).
GFK-2222AD
Chapter 2. CPU Features & Specifications
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