16 TROUBLESHOOTING
16.5 Troubleshooting for Data Link
153
16
Communication cannot be performed occasionally when
executing user program
When the communication cannot be performed occasionally when executing a user program, check the following items.
If the problem is not solved by the above corrective actions, refer to the following section and contact us.
Page 166 Information Required for Inquiries
Station is disconnected
The following explains the troubleshooting when the following symptoms have occurred and the station is disconnected.
• The connected station is disconnected unexpectedly.
• Data cannot be read from/written to the accessed station.
• Communication with the accessed station occasionally fails.
• A relevant station repeats network connection and disconnection
When the station is disconnected, check the following items.
If the problem is not solved by the above corrective actions, refer to the following section and contact us.
Page 166 Information Required for Inquiries
Communication is unstable
When the link scan time and transmission delay time is abnormally longer or a timeout occurs during transient transmission,
check the following items.
If the problem is not solved by the above corrective actions, refer to the following section and contact us.
Page 166 Information Required for Inquiries
Item
Corrective action
Is the error code returned to the user program?
Check the returned value of the communication function. (
Can the network error be monitored with utility?
Check the network status with the utility. (
Page 164 Checking network status with CC-
Link IE Field Network diagnostics)
Does the same error occur when adding the station to the
system?
Check if the same error occurs when adding the station in order next to the existing station
for the system configuration which is configured only by a master station and own station. If
the same error has occurred, check the added station.
•
Page 157 Checking installation environment
•
Page 157 Checking cables and wiring
•
Item
Corrective action
Is there influence of ambient temperature or noise?
Check the installation environment. (
Page 157 Checking installation environment)
Is there an error in the cable or hub?
Is the wiring proper?
Check the cables and wiring. (
Page 157 Checking cables and wiring)
Item
Corrective action
Is there influence of ambient temperature or noise?
Check the installation environment. (
Page 157 Checking installation environment)
Is the L ERR. LED of the master or slave station ON?
Check the LED and take corrective action in the case of L ERR. LED turned ON. (
163 L ERR. LED/L ER LED is turned ON)
Does the error occur on the "Selected Station Communication
Status Monitor" screen in CC-Link IE Field Network diagnostics?
When an error occurred on PORT1 and PORT2 , perform cable and self loopback tests.
(
Summary of Contents for MELSEC Q80BD-J71GF11-T2
Page 2: ......
Page 6: ...4 Disposal Precautions CAUTION When disposing of this product treat it as industrial waste ...
Page 118: ...116 12 MONITORING MEMO ...
Page 140: ...138 14 MELSEC DATA LINK LIBRARY MEMO ...
Page 142: ...140 15 PROGRAMMING 15 1 Precautions on Programming MEMO ...
Page 243: ...241 I U Utility 83 ...
Page 247: ......