6. Redundancy with NX3030 CPU
266
Ethernet Interfaces NX5000
In case is necessary, bigger racks can be used, as the NX9002 (16 positions) and NX9003 (24
positions). It must be observed that all the listed modules, so far in this chapter, have double width
(occupy two positions).
Additionally, it’s also possible to use the PX2612 panel, which allows the execution of some
redundant state machine transitions that, otherwise, wouldn’t be possible, in addition to the automatic
half-clusters shutdown in failure situations.
NX5001 Modules Addition for PROFIBUS Networks
A redundant PLC is up to until four NX5001 modules for PROFIBUS networks usage. Each network
can be single or redundant. In case the PROFIBUS “n” (being “n” a number between 1 and 4) be
redundant, the two networks that belongs to this are named PROFIBUS “n” A and PROFIBUS “n”
B. In case the PROFIBUS “n” be single, the network that belongs to it will be named PROFIBUS “n”
A.
To create a redundant PROFIBUS network, must be inserted two NX5001 modules in each half-
cluster. To create a simple PROFIBUS network, simply insert a NX5001 module in each half-cluster.
Thus, it can be configured up to four simple networks, or two redundant networks, or a redundant and
two simple. In other cases, fewer than four NX5001 modules will be needed in each half-cluster.
More information about PROFIBUS networks is provided in the PROFIBUS Network Configuration
section.
In Figure 6-1, there is only one PROFIBUS network (PROFIBUS 1), and the same is redundant
(PROFIBUS 1 A and 1 B PROFIBUS). In this example, therefore, were inserted two NX5001
modules in each half-cluster.
NX5000 Modules Addition for Ethernet Networks
It’s possible to insert up to six NX5000 modules in each half-cluster, delivering six additional
Ethernet channels, besides the two Ethernet channels already existent in the NX3030 CPU.
The Ethernet channels can be used in an individual way, or organized in NIC Teaming pairs, which
are used to deliver redundant Ethernet channels, and are described, with more details, in the
Redundant Ethernet Networks with NIC Teaming section.
A typical application for the NX5000 module can be the construction of a redundant HSDN (High
Speed Deterministic Network), for the communication between several redundant CPUs. Through
this network, many redundant CPUs can exchange messages in a totally segregated network, in order
to guarantee determinism and a fast communication. Furthermore, configuring this network as
redundant with NIC Teaming pairs, an excellent availability may be reached. In order to build such
network (redundant HSDN), two NX5000 modules must be inserted in each half-cluster. Figure 6-1
shows a redundant HSDN example using two NX5000 modules in each half-cluster.
Applications where input and output modules are connected to Ethernet networks may require extra
interface modules NX5000 to connect to these networks. In these cases, the network that connects the
modules of inputs and outputs can be a simple or redundant network. Furthermore, the interfaces can
be configured with the option of generating life failure. In this case, a network failure will cause a
switch-over.
Figure 6-1 also shows an example with a NX5000 module used in the isolated form (without NIC
Teaming redundancy), inserted at the right side from the other modules in each rack.
NX4010 Module
The NX4010 model, as shows Figure 6-3, was conceived in order to provide the interconnection
between the two PLCA and PLCB half-clusters, and also to connect these half-clusters to the
redundancy control panel PX2612. For further information regarding this module connections, see
Interconnections between Half-Clusters and the Redundancy Control Panel PX2612.
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General