Mitsubishi Electric MELSEC iQ-R Series User Manual page 96

Module communication test
The module communication test checks the hardware of the remote head module. When the communication using the remote
head module is unstable, whether an hardware failure occurs or not can be checked.
The following lists the tests performed.
Test item
Internal self-loopback test
External self-loopback test
■Procedure
1.
Connect the P1 and P2 of the remote head module with an Ethernet cable.
2.
Using the switch on the remote head module, repeat three cycles of STOPRESET/TESTSTOP, taking less than one
second per cycle. (The RUN LED flashes after the 3rd cycle.)
3.
Reset the remote head module to start the module communication test.
• Do not perform a module communication test while connected to another station. The operation of another
station may failed.
• The redundant function cannot be used during execution of the module communication test.
■Checking the status and result of module communication test
The test status and result can be checked with LED indication of the module.
Test status
Test in progress
Normal completion
Abnormal end
■Error number when the test abnormally ended
The dot matrix LED indicates the error number with the form of "Port number Error number".
For example, "1 3" is indicated when error No.3 occurs in P1.
If the module communication test fails, check the following.
Error Description
number
1 Internal self-loopback test failure
2 External self-loopback test connection error
3 External self-loopback test communication
error
4 TROUBLESHOOTING
94
4.3 Checking the Module Status
LED indication
The dot matrix LED indicates "UCT".
The dot matrix LED indicates "OK".
The ERR LED turns on and the dot matrix LED indicates "ERR" and error number alternately at intervals of 1 second.
Action
Please consult your local Mitsubishi representative.
Check the Ethernet cable connection or replace the Ethernet cable, and perform the test
again. If the test fails again, please consult your local Mitsubishi representative.
Replace the Ethernet cable and perform the test again. If the test fails again, please consult
your local Mitsubishi representative.
Description
Checks whether the communication function of the module can be performed
normally.
Checks whether the communication can be performed normally with the cable
connected between two connectors.