Mitsubishi-electric QJ71C24N Manuel d'utilisateur télécharger pdf (Page 110)

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MELSEC-Q

4 SETTINGS AND PROCEDURES PRIOR TO OPERATION

(Procedure 4) Checking the results of an individual loopback test

(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 8.6.9)

• 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 storage area (address CH1: 201

CH2: 202

Check the error descriptions on the screens by bit-decoding the monitored value

(16-bit integer). Each bit corresponds to the following error description.

Buffer memory monitored

Address

Bit location

CH1 side

201

CH2 side

202

Description when corresponding

bit is on

Corrective action

b0 to b3 — — —

Error occurrence in the CPU module.

Remove errors occurring in the CPU

module.

Not enough power supply capacity. Examine the power supply capacity.

Module is not mounted correctly. Reinstall the module properly.

b4 C/N —

Error occurrence in the base unit,

extension cable, CPU module, or the

Q series C24.

Check each module and remove the

cause of the error.

Reconnect the cable correctly.

Reinstall the module correctly.

b5 to b13 — — —

b14 CH2 ERR CH2 side communication error

b15

—

CH1 ERR CH1 side communication error

Reconnect the cable correctly.

Examine the test wiring connection.

(Procedure 5) Ending individual station loopback test

(1) Perform the following procedures after checking normal completion/abnormal

completion of the test result.

Normal completion : Perform operation (2) to finish the test.

Upon error occurrence : Remove the cause of the error according to the corrective

action specified in the table above, and test again.

(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.

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Mitsubishi-electric QJ71C24N Manuel d'utilisateur Page 110

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Mitsubishi-electric QJ71C24N Manuel d'utilisateur Page 110

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