Emerson ControlWave Instruction Manual page 127

Ethernet Port
Loop-back Test
Test Procedure
Revised Aug-2015
ControlWave I/O Expansion Rack Instruction Manual
The Ethernet option on the WINDIAG Main Menu allows you to
select the Ethernet communication port (1 through 3) to test.
This test configures the Ethernet port's ability to transmit and receive
via the twisted pair. The text transmits frames and compares them
against received frames. You need a special loop-back plug (shown in
Figure 5-25) to perform the Ethernet loop-back test:
Figure 5-25. RJ-45 Ethernet Loop-back Plug
: You cannot test a communications port while you are using it.
Note
You can only test currently unused ports. After you complete
testing on all other communication ports (and verify their correct
functioning), you must reconnect (using a now validated port)
and test the remaining untested port.
Use this procedure to test the Ethernet port.
Connect an external Ethernet loop-back plug (see Figure 5-25)
1.
to the Ethernet port on the CPU module to be tested.
Select Ethernet on the WINDIAG Main Diagnostics Menu.
2.
The Ethernet Diagnostic screen opens:
Service & Troubleshooting 5-31