Mitsubishi Electric QJ71C24N User Manual page 133

4 SETTINGS AND PROCEDURES PRIOR TO OPERATION
(Procedure 4) Checking the results of an individual loopback test
Buffer memory monitored
Address
Bit location
b0 to b3
b4
b5 to b13
b14
b15
(Procedure 5) Ending individual station loopback test
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(1) This test is performed repeatedly. When the ERR LED is off, the test is being
executed normally.
(2) The test is completed with an error when the ERR LED is lit. Check the error
description on one of the following screens. (The ERR LED is lit upon error
occurrence, and the test is completed.)
• The "Monitor/test others" screen of GX Configurator-SC (see Section 9.6.10)
• The buffer memory monitor screen of GX Developer (see the GX Developer
Manual for operation method)
When checking for errors in the buffer memory monitor screen of GX
Developer, monitor the LED ON status and communication error status
(address: 201
Check the error descriptions on the screens by bit-decoding the monitored value
(16-bit integer). Each bit corresponds to the following error description.
CH1 side CH2 side
201 202
H H
—
C/N —
—
CH2 ERR
—
CH1 ERR
(1) Perform the following procedures after checking normal completion/abnormal
completion of the test result.
Normal completion
Upon error occurrence : Remove the cause of the error according to the corrective
(2) Perform the ending procedure for individual station loopback test
1) Follow the procedure in Section 4.7.1 to perform a ROM/RAM/switch test.
2) Perform the following procedure to end the test and start data communication
with an external device.
• Set the switch settings on GX Developer according to the procedure
specified in Section 4.5.2.
• Turn off the power to the station on which the Q series C24 is installed and
connect the communication cable with the external device.
• Turn on the power to the station on which the Q series C24 is installed.
/202 ).
H H
Description when corresponding
bit is on
—
Error occurrence in the CPU module.
Not enough power supply capacity.
Module is not mounted correctly.
Error occurrence in the base unit,
extension cable, CPU module, or the
Q series C24.
—
CH2 side communication error
CH1 side communication error
: Perform operation (2) to finish the test.
action specified in the table above, and test again.
MELSEC-Q
Corrective action
—
Remove errors occurring in the CPU
module.
Examine the power supply capacity.
Reinstall the module properly.
Check each module and remove the
cause of the error.
Reconnect the cable correctly.
Reinstall the module correctly.
—
Reconnect the cable correctly.
Examine the test wiring connection.
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