Hitachi HIDIC EH-150 Applications Manual page 109

(2) External loop back test
[Outline] Communication circuit test using actual signal via loop back connector.
[Dip switch setting]
[Test procedure]
(a) Prepare a special loop back connector as below.
(b) Set the dip switch as above and plug in the loop back connector to EH-ETH.
(c) Turn on the power to PLC or press the reset button.
[Test time] Approximate 70 seconds
Figure 10.2.1 Wiring connection of loop back connector
[Result] Sown in Table 10.2.3
POW I.ERR
Off -
Solid Green Solid Green
* During test, Tx/RX LED turns on because EH-ETH send test packet.
Importance
Be sure to use check the wiring connection of your loop back connector.
Only Bit7 ON
1 2 3 4 5
ON
RJ-45(8 pin)
Table 10.2.3 2 Result of external loop back test
STATUS ERR
- -
Off
Green,
flickering
Solid Green One time passed
Solid Green Solid Green Passed
Off Solid Red
10-9
6 7 8
1: TD +
2: TD -
3: RD +
4
5
6: RD –
7
8
Condition or the diagnosis result
Loop back connector missing
On testing
Failure
Chapter 10 Troubleshooting