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4.6 Self-diagnostics Test
4.6.1 Self-loopback test
4
SETTINGS AND PROCEDURE TO OPERATION
4.6 Self-diagnostics Test
This section explains the self-diagnostics test designed for checking the MES interface
module communication function and hardware.
4.6.1 Self-loopback test
Execute the self-loopback test for a hardware check including the communication function
of the MES interface module (10BASE-T/100BASE-TX interface).
(1) MES interface module operation mode setting
1 In [Switch setting for I/O and intelligent function module] of GX Developer, set
"Mode setting" to "Self-loopback test". (Switch 1: 0002h)
2 Match the other intelligent function module switch settings to the setting contents
used.
(2) Self-loopback test execution
1 If a cable has been connected to the 10BASE-T/100BASE-TX interface,
disconnect it.
2 Set the programmable controller CPU to STOP status.
3 Reset the programmable controller CPU.
4 After the programmable controller CPU is reset, the following self-loopback test is
executed automatically.
1) Self-loopback check
This test checks whether data can be sent to/received from in the MES
interface module.
During the test, the ERR. LED flashes.
(3) Confirmation of the self-loopback test result
1 Check the ERR. LED status to see the self-loopback test result.
2 When the test is completed normally, set the "Mode setting" to "Online" with
[Switch setting for I/O and intelligent function module] of GX Developer and reset
the programmable controller CPU. (Switch 1: 0000h)
3 When the test has failed, conduct the self-loopback test again.
If an error occurs again, a possible cause is the hardware failure of the MES
interface module.
Please consult your local Mitsubishi representative.
Table 4.7 Self-loopback test result
ERR. LED status Self-loopback test result
OFF Completed
ON Failed