9 TROUBLESHOOTING
9.2 Troubleshooting by Symptom
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9
When the link scan time delays
Refer to the following.
Page 46 When a station is repeatedly disconnected and reconnected
When access to the CPU module is slow
Check the following (especially when an error is returned or a response is not returned):
*1 Check the communication status of Ethernet by referring to the areas for storing such as the simultaneous transmission error detection
count and the number of times that data are not read due to receive buffer full. For details, refer to the manuals of each series.
When cyclic transmission of the master station stops
Check the following:
Check item Action
Is any of the following function being executed?
• Access from GX Works3/GX Works2 (such as ladder monitor)
• Latch function
• Data logging function
Stop the function. Or, modify settings. For example, extend the execution
interval, decrease the execution frequency, or reduce the range of the
function.
Is the response of built-in Ethernet functions such as FTP, socket
communications, and SLMP communications slow, an error, or not
returned?
*1
• Stop the function. Or, modify settings. For example, extend the execution
interval and decrease the execution frequency of the function.
• Change UDP/IP communications to TCP/IP communications, or add resend
processing.
Is CC-Link IE Field Network Basic being simultaneously executed at a
different network address on the same line?
Separate the network and configure two CC-Link IE Field Network Basic lines.
Are data communications with other Ethernet devices being performed on the
same line?
Separate the network for other Ethernet devices from the CC-Link IE Field
Network Basic line.
Check item Action
Is the transmission status of slave stations normal? • If there are any disconnected slave stations, take actions according to the
error details.
• If there are no disconnected slave stations, check the network connection.
A problem may stem from a device other than those set in the master
station.
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