6. REDUNDANCY WITH NX3030 CPU
6.3.12. NIC Teaming and Active IP Combined Use
In case a determined port pair form a NIC Teaming in a redundant CPU, these ports can implement, at the same time, the
strategies NIC Teaming and Active IP.
E.g. if the NX3030 CPU NET 1 and NET 2 ports form a NIC Teaming pair, then:
IP Address PLC A: IP address of the NET 1 + NET 2 ports in the PLCA NX3030 CPU
IP Address PLC B: IP address of the NET 1 + NET 2 ports in the PLCB NX3030 CPU
IP Address Active: IP address of the NET 1 + NET 2 ports in the NX3030 CPU in the Active CPU
This way, the excellent availability from the NIC Teaming strategy is associated with the practicality of the Active IP
strategy, which doesn’t need scripts in SCADA systems or in other clients connected to the Active CPU server.
6.3.13. Ethernet Interfaces Use with Vital Fault Indication
The Ethernet ports of NX3030 and NX5000 modules can be configured to generate vital failures. This option is important
for applications in which the modules of inputs and outputs are distributed over Ethernet network. In this case, if a failure
occurs on the Ethernet port, this will generate a switchover. This behavior is applicable only to Ethernet ports where there is at
least a communication driver that manages fault.
The communication drivers that generate vital failure are MODBUS Client and MODBUS Symbol Client (all references
to MODBUS Client in the following sections apply to both cases). The MODBUS Server drivers, MODBUS Symbol Server
and EtherCAT Master do not generate vital failure. Thus, if an Ethernet port has a MODBUS Client driver configured and a
failure occurs in the Ethernet port, a switchover will be generated if vital fault option is enabled. If the driver configured on
the Ethernet port is a MODBUS Server, even if there is failure in the door, it will not generate a vital failure that causes a
switchover.
To a fault be considered a vital failure in an Ethernet port on a MODBUS Client, all servers configured in the driver must
be faulty. That is, if there is more of a MODBUS Client driver configured in the same Ethernet port, is considered vital failure
when all servers of both Clients are faulty.
When the Ethernet port is configured to operate with NIC Teaming, the vital failure will be considered only when the two
pair of doors fail.
6.3.13.1. Failure in Ethernet Interface
A switchover can be generated due to failure in the Ethernet interface, such as a loss of link. The link loss may be caused,
for example, by a cable breakage or failure of a switch on the Ethernet network. Accordingly, it is necessary that, in addition
to being configured to generate vital failure, there is a MODBUS Client instance configured on the Ethernet interface.
When the interval of MainTask is greater than or equal to 100 ms after the fault is detected the switchover will occur in up
to two cycles of MainTask. When the interval of MainTask is less than 100 ms switchover will occur within 100 ms plus the
time of MainTask after detection of failure.
6.3.13.2. Failure in Connected MODBUS Server
The time to detect the fault in a remote MODBUS Server depends on the time-out settings configured on each MODBUS
Client. When a fault is detected in all Servers, the bAllDevicesCommFailure diagnostic (see Modbus Diagnostics used at
Redundancy) section used in) changes its state to TRUE. When this happens, the switchover will happen 3 seconds after this
transition.
6.3.14. OPC DA Communication Use with Redundant Projects
The OPC DA protocol can be configured to communicate with redundant clusters over SCADA systems. When this option
is selected in the creation of a redundant project, the Symbol Configuration object is added to the project. In this object are set
system variables that will be sent to the SCADA system. This communication option is enabled in the CPU of the Ethernet
ports NX3030. For further information related to the configuration of an OPC communication with redundant projects, refer
to the Configuration with the PLC on the OPC DA Server with Connection Redundancy section of this Manual.
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