2. CONFIGURATION
2.1.4.
Step 4 – Determine backplane rack quantity
The backplane rack quantity must be defined regarding the following rules:
Fieldbus interfaces and special modules can be used in the same rack together with the CPU. This rule isn’t valid for the
NX4000 module, which is considered a special module, but is used in all racks. This document presents the complete
Nexto Series module list. In this list, it’s possible to verify which modules are defined as fieldbus interfaces and special
modules
I/O modules can be used whether in the same CPU rack as in remote racks
The Nexto Series have modules with two different widths. This way, it’s necessary to check the documentation of each
module for the number of positions in the rack it requires
The Nexto Series have different kinds of racks. Each model has a specified number of slots
It’s important to remember that, besides the CPU, the I/O modules, fieldbus interfaces and special modules, each backplane
rack needs at least one power source. When remote backplane racks are used, all of them must have at least one bus expansion
module. Power supply modules and bus expansion modules must be considered in the used space checking of the rack.
2.1.5.
Step 5 – Determine the backplane rack connector cover quantity
It’s strongly recommended all slots not used to be covered by the Nexto Series Backplane Rack Connector Cover - NX9102.
This product has the objective to protect the not used slots from dirt, dust and accidents that might happen during the product
utilization.
2.1.6.
Step 6 – Determine the power supply module quantity
Each rack must have at least one power supply module. More information regarding power supply modules can be found in
the document Technical Characteristics of the respective power supply module. The list of all available power supply modules
can be found within the Nexto Series modules list, in this document.
It’s important to verify if the selected power supply module is capable of supply the required current for all modules within
a specific backplane rack, including the backplane rack itself.
Another issue to be verified with care is if the selected power source input voltage range is in agreement with the project
design.
2.1.7.
Step 7 – Bus expansion modules and bus expansion cables
The bus expansion modules and its respective cables are responsible for the interconnection between all Nexto Series racks.
Therefore, they are needed only when more than one rack is used. In this case all racks must have at least one bus expansion
module. When bus expansion module redundancy is used, each rack must have two modules. More information regarding the
bus expansion modules utilization can be found in the document NX4000 Module Technical Characteristics - CE114600.
2.1.8.
Step 8 – External power supply
The output voltage and the current capacity of an external power source must be defined regarding the following loads:
Nexto Series power supply module voltage limit levels
Nexto Series power supply module input current
Input current for the other modules
Digital and analog inputs and field sensors current
Current of the loads connected to the outputs
It’s recommended the utilization of fuses for field sensors and outputs, to increase the system reliability in case of field
short-circuit.
2.1.9.
Step 9 – MasterTool IEC XE license choice
According to the system requirements, it’s possible to evaluate the best license option for the MasterTool IEC XE. All
available options together with the license comparison are described in the MasterTool IEC XE User Manual – MU299609.
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