Internal Self-Loopback Test - Mitsubishi Electric Q Series Reference Manual

4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION

4.5.2 Internal self-loopback test

2
MODE
RUN MNG
T.PASS D.LINK
SD RD
ERR. L ERR.
4 - 12
This test checks the hardware of a standalone network module, including the
send/receive circuit of the transmission system.
(1) Do not connect the optical fiber cable with the QJ71LP21 network module (for the
optical loop system). However, make sure that the exterior random light does not
enter from the connector.
Do not connect cables or terminal resistors if the QJ71BR11 network module (for
the coaxial bus system) is used.
For QJ71LP21
(optical loop system)
IN
OUT
(2) Set the mode setting switch of the network module to "2". Set it to "6" when
using the QJ71LP21-25 at 25Mbps.
The internal self-loopback test is selected.
(3) Switch power on.
The internal self-loopback test is executed; check the execution status on the
network module display.
The T. PASS LED flashes during the test.
When the T. PASS LED flashes 20 times or more and if the ERR.LED does not
flash, this condition indicates normal completion.
If the test is abnormally completed, the ERR. LED flashes.
Upon detection of an error, the test will be terminated (abnormal termination).
Before test
⇒
T.PASS : Off
When an error occurs, the contents of the error should be checked with GX
Developer. The faulty area can be examined by replacing the module.
REMARKS
In the MELSECNET/H, a link refresh is executed even when the module is offline.
Thus, the user can check the testing status and the result with GX Developer or a
sequence program using the link special registers.
Baton pass status (host)
Cause of baton pass interruption
Offline test execution item/faulty
station (requesting side)
Offline test result (requesting side)
For details on how to check the error contents, see Chapter 8.
If two or more modules are installed, the testing status and the result of each module
can be checked by adding 200
For QJ71BR11
(coaxial bus system)
Do not allow
exterior random
light to enter
During test Normal completion of test
⇒
: Flashing : Flashing 20 times (approx. 10 seconds) or
more
Abnormal completion of test
ERR. : Flashing
SW0047
SW0048
SW00AC
SW00AD
to the corresponding device number.
H
MELSEC-Q
Do not connect
anything
1F : Offline test
H
2 : Offline test
H
8 : Internal self-
H
loopback test
0 : Normal
1 or larger : Error code
4 - 12