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4 TROUBLESHOOTING
4.4 Troubleshooting by Symptom
When a station is disconnected from the network
The following is the action to be taken when a station in data link is disconnected.
If the above actions do not solve the problem, perform the following tests to check for an error.
• Cable test (
When a station is repeatedly disconnected and reconnected
The following lists the actions to be taken when a station in data link is repeatedly disconnected and reconnected.
If the above actions do not solve the problem, perform the following tests to check for an error.
• Cable test (
When communication is unstable
The following lists the actions to be taken when link scan time or transmission delay time is long or when a transient
transmission timeout occurred.
If the above actions do not solve the problem, perform the following tests to check for an error.
• Cable test (
Check item
Action
Is the ambient temperature for the module within the specified range?
Keep the ambient temperature within the specified range by taking action
such as removing heat source.
Check item
Action
Are 1000BASE-T-compliant Ethernet cables used?
Replace the cables with 1000BASE-T-compliant Ethernet cables.
(
MELSEC iQ-R Simple Motion Module User's Manual (Startup))
Is the station-to-station distance 100 m or less?
Change the station-to-station distance to 100 m or less.
Does the cabling condition (bending radius) meet the specifications?
Refer to the manual for the Ethernet cable, and correct the bending radius.
Is any Ethernet cable disconnected?
Replace the Ethernet cable.
Is the switching hub used operating normally?
• Check if a 1000BASE-T-compliant switching hub is used. (
MELSEC iQ-
R Simple Motion Module User's Manual (Startup))
• Power off and on the switching hub.
Check item
Action
Is the L ERR LED of the master or slave station on?
Perform troubleshooting for when the L ERR LED turns on. (
Is the ambient temperature for the module within the specified range?
Keep the ambient temperature within the specified range by taking action
such as removing heat source.
Is any error shown in "Selected Station Communication Status Monitor" of CC-
Link IE Field Network diagnostics?
If an error is identified at P2, perform a cable test.
Is there any noise affecting the system?
Check the wiring condition.
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