Appendix 6 Self-Diagnostic Tests; Appendix 6.1 Self-Loopback Test - Mitsubishi Electric MELSEC-L SERIES Basic User Manual

Appendix 6
This section describes the self-diagnostic tests to check data communications and hardware of an E71.
Appendix 6.1
Hardware including the E71 communication circuit is checked. Send the test message destined to the own station of
the E71 to the line. Then check whether the same message can be received over the network.
(1) Operating procedure
Use the following procedure.
*1 When the line is not connected, the self-loopback test is not performed and ends normally.
If an error is detected in the self-loopback test, the following causes are possible. The error information is stored
in Error log area (address: E5
• E71 hardware error
• Ethernet line error
There is no hardware-related problem even when the self-loopback test is executed while the destination is online. Because
a packet collision occurs when there are many packets on the line, the test may fail or may not be completed in five seconds.
In this case, execute the test after stopping data communications between other devices.
332
Self-Diagnostic Tests
Self-loopback test
) in the buffer memory.
H
1.
Connect the E71 to the line.
2.
Set the switch on the CPU module to "STOP".
3.
Select "Self-Loopback Test" under "Mode" and write
the parameter to the CPU module.
Project window
Parameter]
"Ethernet" under "Network Type".
4.
Resetting the CPU module starts the test. Test time
is approximately five seconds. The RUN and OPEN
LEDs turn on during the test.
5.
Check the LED of the E71 after five seconds. When
the test is running normally, the RUN LED turns on.
If the test fails, the RUN and ERR. LEDs turn on.
*1
[Parameter] [Network
[Ethernet/CC IE Field] Select