Mitsubishi Electric MELSEC iQ-F Series User Manual page 110

When cyclic data cannot be read/written from/to the remote station correctly
If the cyclic data cannot be read in correctly even though the CC-Link IE Field Network Basic diagnostics state is transmitting,
check the following.
■CC-Link IE Field Network Basic
Check item
Is the IP address for the master station/remote station set correctly?
Have the IP address settings been changed between devices?
Is the IP address set in duplicate?
Is there a device with the same IP address as the master station/remote
station on the same segment?
Are the devices specified in the refresh settings for the master station correct?
Are the devices specified in the refresh settings for the master station used in
other applications?
Is the remote station specified as a reserved station in "Network Configuration
Settings" of the master station?
Has the accumulated number of timeouts of the remote station considered
abnormal been counted up?
Has the accumulated number of disconnection detection of the remote station
considered abnormal been counted up?
*1 There may be cases when duplicated master stations or duplicated remote stations are not detected as an error.
*2 The accumulated number of timeouts and the accumulated number of disconnection detection can be checked in diagnostic information
1.
When a station is repeatedly disconnected and reconnected
If the transmission state repeatedly changes from disconnected and return, check the following.
■Ethernet
Check item
Are the Ethernet cables inserted to each slot until they click?
Do the used cables conform to the Ethernet standard?
Is any Ethernet cable disconnected?
Is there any source of noise near the Ethernet cables?
Does any error occur in the external device, hub or router?
Is the hub used applicable to the communication speed of the connected
master station/remote station?
Does the general-purpose Ethernet function (socket communication) respond
quickly? Does it return an error response or no response?
10 TROUBLESHOOTING
108
10.5 Troubleshooting by Symptom
*1
*2
*2
Action
Correct the IP address of the master station/remote station.
Change the master station/remote station IP addresses so they are not
duplicated.
Check and correct the refresh settings.
Check the settings and programs for the master station/remote stations, and
correct them if they are incorrect.
Cancel the reserved station setting. ( Page 71 )
Check Page 108 When a station is repeatedly disconnected and
reconnected and take actions.
Action
• Lock the Ethernet cables securely.
• Check that the Ethernet cables are correctly connected to the external
devices and hubs.
Check the specifications of the Ethernet cables used.
Replace the disconnected Ethernet cable.
Keep the Ethernet cables away from the source of noise. Or, use the cables
resistant to noise.
Take actions, referring to the manual for the device having an error.
Replace the hub with the one corresponding to the master station/remote
station communication speed.
• 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.