3. INSTALLATION
The IP Address and Subnet Mask parameters can be seen on the CPU graphic display via parameters menu, as described
in CPU’s Informative and Configuration Menu section.
The NET 2 interface network parameters can be changed through MasterTool IEC XE. For further information regarding
configuration and parameters modifications, see Ethernet Interfaces Configuration section.
3.3.2. Gratuitous ARP
The NETx Ethernet interface promptly sends ARP packets type in broadcast informing its IP and MAC address for all
devices connected to the network. These packets are sent during a new application download by the MasterTool IEC XE
software and in the CPU startup when the application goes into Run mode.
Five ARP commands are triggered within a 200 ms initial interval, doubling the interval every new triggered command,
totalizing 3 s. Example: first trigger occurs at time 0, the second one at 200 ms and the third one at 600 ms and so on until the
fifth trigger at time 3 s.
3.3.3. Network Cable Installation
Nexto Series CPUs Ethernet ports, identified on the panel by NET, have standard pinout which are the same used in PCs.
The connector type, cable type, physical level, among other details regarding the CPU and the Ethernet network device are
defined in the Ethernet Interfaces.
The table below present the RJ-45 Nexto CPU female connector, with the identification and description of the valid pinout
for 10BASE-TE and 100BASE-TX physical levels.
Figure 6: RJ45 Female Connector
Pin Signal Description
1 TXD + Data transmission, positive
2 TXD - Data transmission, negative
3 RXD + Data reception, positive
4 NU Not used
5 NU Not used
6 RXD - Data reception, negative
7 NU Not used
8 NU Not used
Table 22: RJ45 Female Connector Pinout - 10BASE-TE and 100BASE-TX
The interface can be connected in a communication network through a hub or switch, or straight from the communication
equipment. In this last case, due to Nexto CPUs Auto Crossover feature, there is no need for a cross-over network cable, the
one used to connect two PCs point to point via Ethernet port.
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