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13 - 1 

MELSEC-QnA 

13   TROUBLESHOOTING 

 

 

 

 

 13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13. TROUBLESHOOTING 

13.1 Verification When a Trouble Occurs 

Details to be checked and corrective actions for each trouble are shown below: 

 

Trouble description 

Details to be checked 

Confirmation action 

Are there any disconnected cables? 

• Check the cable status visually or with a line test. 
• Verify the line status (SW0090). 

Are terminating resistors connected properly 
to both end stations? 

Connect terminating resistors attached to 
AJ61QBT11 and A1SJ61QBT11 to both end stations.

Has an error occurred at the master station's 
programmable controller CPU? 

Verify the error code of programmable controller CPU 
and perform the corrective action. 

Are parameters set for the master station?  Verify the parameter details. 
Is a request for data link startup (Yn6 or 
Yn8) turned on? 

Verify the sequence program. 

Did an error occur at the master station? 

Verify the following: 
• The parameter status at the host station (SW0068) 
• The switch setting status (SW006A) 
• Loading status (SW0069) 
• Is the master station "ERR" flashing? 

(Refer to Section 13.2.) 

Unable to perform data link for the 
entire system. 

Is the scan time exceeding the maximum 
value in the synchronous mode? 

Switch to the asynchronous mode or slow down the 
transmission speed. 

Is the remote I/O station performing data 
link? 

Verify using the following means: 
• LED display at the module 
• Other station data link status (SW0080 to SW0083) 

of the master station 

Is data read from the correct address of 
remote input RX (buffer memory)? 

Verify the sequence program. 

Is the station incorrectly set as reserved? 

Verify parameters. 

Unable to get input from a remote I/O 
station. 

Did the station number overlap? 

Verify the station number. 

Is the remote I/O station performing data 
link? 

Verify using the following means: 
• LED display of the module 
• Other station data link status (SW0080 to SW0083) 

of the master station 

Is the refresh instruction (Yn0) at the master 
station turned on? 

Verify the sequence program. 

Is data written to the correct address of 
remote output RY (buffer memory)? 

Verify the sequence program. 

Is the station incorrectly set as reserved? 

Verify parameters. 

Cannot output data from a remote I/O 
station. 

Did the station number overlap? 

Verify the station number. 

Is the remote device station performing data 
link? 

Verify using the following means: 
• LED display of the module 
• Other station data link status (SW0080 to SW0083) 

of the master station 

Is data read from the correct address of 
remote input RX (buffer memory)? 

Verify the sequence program. 

Is the station incorrectly set as reserved? 

Verify parameters. 

Unable to get remote input (RX) from a 
remote device station. 

Did the station number overlap? 

Verify the station number. 

 

After checking Other station data link status (SW0080 to SW0083), perform the following. 

1

 Check if the wiring is correct. 

2

 Check if the terminating resistors are connected correctly to the modules on both ends. 

3

 Confirm if the communication is successful after slowing down the transmission speed. 

4

 Confirm if the settings of the parameter and the startup station match each other. 

5

 Confirm if the station numbers do not overlap. 

6

 Replace with a correctly operating module, and check to see if it is a module malfunction.