Installing the NAE/NIE Technical Bulletin
18
To remove the EOL terminations, move both switches on the block to
the side marked 1 2. Set the switch blocks appropriately for the N2-A
and N2-B buses. Both EOL switches on one block should be ON if the
NAE is an end (terminating) device on the corresponding N2 Bus. The
NAE follows the same rules as other switch-terminating devices listed
in the
Setting Terminations
section of the
N2 Communications Bus
Technical Bulletin (LIT-636018)
.
Ethernet Network
Table 7 shows the rules for the Ethernet network.
Table 7: NAE Ethernet Network Rules
Category
Rules/ Maximums Allowed*
General
Star topology with network hubs/switches
Number of Devices
Maximum of 100 devices can be connected to one site in the Metasys
system extended architecture.
2000 m (6600 ft.) for plastic/glass fiber optic with external adapter
Line Length and Type
100 m (330 ft.) for twisted pair, 18 AWG recommended
Cable
26 AWG twisted pair or larger, CAT5
Terminations
For 10/100BaseT, no line terminators allowed
*
Refer to the
N1 Ethernet/IP Network Technical Bulletin (LIT-6360175)
for recommended parts and part
numbers.
System RE-BOOT Switch
The system RE-BOOT switch forces a manual restart of the NAE
processor and you lose all changes you made to the system since the
last time the NAE saved, including alarm, trend, and audit trail data.
Press the RE-BOOT switch
only
if the NAE fails to respond and
cannot be accessed by any user device.
See the
Troubleshooting the NAE/NIE Technical Bulletin
(LIT-1201417)
for details.
Important:
Do not press the system RE-BOOT switch unless you have
tried other reasonable means to fix the problem. When you press the system
RE-BOOT switch, you lose all changes made to system data in the NAE
since the last save, including audit data.