Mitsubishi Electric RD78G4 User Manual page 69

When a station is disconnected from the network
The following is the action to be taken when a station in data link is disconnected.
Check item
Is the ambient temperature for the module outside the specified range?
When a station repeats network initialization
The following lists the actions to be taken when a station in data link repeats network initialization.
Check item
Do the used Ethernet cables conform to the Ethernet standard?
Is the station-to-station distance 100m or less?
Does the cabling condition (bending radius) meet the specifications?
Is any Ethernet cable disconnected?
Is the switching hub used operating normally?
Is the station that is the time synchronization source normal?
Are resets of other stations repeated?
Are other stations repeatedly powering on/off?
When using an authentication class B/A device with a communication speed
of 100Mbps in the basic cycle, is "System Reservation Time" in
"Communication Period Setting" under "Basic Settings" of the master station
set to 20s?
When communication is unstable
When cyclic data transfer processing time or transmission delay time is long or when a transient transmission timeout
occurred, check the following items.
Check item
Is the L ER LED of the Motion module turned on?
Is the ambient temperature for the module outside the specified range?
Is any error shown in "Selected Station Communications Status Monitor" of
CC-Link IE TSN/CC-Link IE Field diagnostics?
Is there any noise affecting the system?
Action
Keep the ambient temperature within the specified range by taking action
such as removing heat source.
Action
Replace the cables with Ethernet cables which conform to the standard. (
MELSEC iQ-R Motion Module User's Manual (Startup))
Change the station-to-station distance to 100m or less.
Refer to the manual for the Ethernet cable, and if the bending radius exceeds
the specified range, correct the bending radius.
If an Ethernet cable is disconnected, replace the Ethernet cable.
• Use a switching hub that conforms to the standard. (MELSEC iQ-R
Motion Module User's Manual (Startup))
• Power off and on the switching hub.
Check the manual of the module used for the time synchronization source
station.
Avoid unnecessary reset since a station is disconnected while resetting.
Avoid unnecessary power-off, since a station is disconnected while turned off.
Set "System Reservation Time" to 200s.
Action
If turned on, perform troubleshooting for a case when the L ER LED is turned
on. ( Page 51 When the L ER LED turns on)
Keep the ambient temperature within the specified range by taking action
such as removing heat source.
If an error is identified at P1 or P2, perform a cable test and a module
communication test.
Change the placement and/or wiring of the modules so that the system is not
affected by noise.
3.4 Troubleshooting by Symptom
3 TROUBLESHOOTING
3
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