1. INTRODUCTION
1.1.4.3. Single CPU with Remote Rack Expansion
This architecture is based on a base rack (where the CPU is placed) and remote racks. The communication between the
base rack and remote racks is done via the bus expansion module. Each remote rack needs its own power supply module
(PSU) and bus expansion module. Each expansion module can be located 100 m far from the other using standard shielded
CAT5 Ethernet cables. The expansion module has two RJ45 ports, where one port is for incoming data and another one for
outgoing data. In this application example, the base rack expansion module is connected using only one cable and leaving the
incoming data port open. The last remote rack has the outgoing data port open. The remote racks in between, will have both
ports connected: one port connected to previous rack and the other to the next rack. Each expansion module has a switch for
selecting the rack number. Each rack must have a unique address.
When this kind of architecture is used, it is important to remember that in case of Nexto modules usage, only this type
of module can be used in the local and/or expansion rack. The same is true in case of Nexto Jet modules usage. The next
architectures that follow in Figure 5 and Figure 6 are examples with Nexto and Nexto Jet modules.
This architecture is intended for medium to large applications, where the number of I/O points is high.
Figure 5: Single CPU with Remote Rack Expansion and
Nexto Modules
Figure 6: Single CPU with Remote Rack Expansion and
Nexto Jet Modules
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