6. REDUNDANCY WITH NX3030 CPU
The rack itself where the modules are inserted, which can be one of the following:
• NX9000, with 8 positions
• NX9001, with 12 positions
• NX9002, with 16 positions
• NX9003, with 24 positions
The power supply NX8000, at rack positions 0 and 1
The NX3030 CPU, at rack positions 2 and 3
The module NX4010, at rack positions 4 and 5
The figure below shows an example of a redundant CPU minimum configuration, using the smallest rack (NX9001, with
12 positions). In this case, it can be observed that the three modules inserted in the rack have double width (occupy two rack
positions).
Figure 165: Minimum configuration of a redundant CPU in rack NX9001
6.2.2. Typical Configurations of a Redundant CPU
A minimum configuration, as the one shown on Figure 165, may already work as “redundant processing unit”. It would
be possible to use the serial and Ethernet communication channels from NX3030 CPU, for instance, for MODBUS TCP
communication with a SCADA system, and MODBUS RTU and/or MODBUS TCP communication with smart field devices
or MODBUS remote I/O systems.
In typical configurations, however, additional modules are inserted in the PLCA and PLCB half-clusters, for instance, to
deliver a remote PROFIBUS I/O and Ethernet additional channels.
Among the additional modules which, optionally, may be inserted in the half-clusters, are the following:
PROFIBUS Masters NX5001
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.
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