Mitsubishi Electric MELSEC iQ-R Series User Manual page 395

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.
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 "Communication Speed" of the master station is set to "100Mbps", is
"System Reservation Time" in "Communication Period Setting" under "Basic
Settings" of the master station set to 20s?
When "Communication Speed" of the master station is set to "1Gbps" and a
CC-Link IE TSN Class B/A device with a communication speed of 100Mbps
is used, is "Communication Period Setting" set to "Basic Period" or "Normal-
Speed"?
In multicast mode, are a local station and a CC-Link IE TSN Class A remote
station connected on the end side via a switching hub?
When 'Protocol operating status'
(Un\G1294016) is '1: Operating with
the protocol version 1.0'
If the master station supports protocol version 2.0, do the system
configuration of mixture of CC-Link IE TSN Class B/A and "TSN HUB
Setting" in "Connection Device Information" under "Basic Settings" differ?
Does any of the stations break the restrictions of the TSN hub?
When "Communication Speed" of the master station is 1Gbps, does the
cyclic data size exceed 2K bytes in total for all slave stations on the
100Mbps device side at the boundary between a 1Gbps CC-Link IE TSN
Class B device except for the master station and 100Mbps CC-Link IE TSN
Class B device?
In multicast mode, is the CC-Link IE TSN Class A remote station connected
to a local station or remote station that does not support the multicast filter?
■For firmware version "01"
Is a CC-Link IE TSN Class A device that supports the CANopen profile with
the protocol version 2.0 connected?
If the above actions do not solve the problem, perform the following tests to check for an error.
• Module communication test ( Page 371 Module Communication Test)
Does the cyclic data size exceed 2K
bytes in total for CC-Link IE TSN
Class A devices connected to a CC-
Link IE TSN Class B device except
for the master station? (Including
when a CC-Link IE TSN Class B
device is connected via a general-
purpose hub)
Action
Replace the cables with Ethernet cables which conform to the standard. (
Page 71 Wiring products)
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. ( Page 72 Switching
hub (when the system configured with CC-Link IE TSN))
• 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.
For a CC-Link IE TSN Class B/A device with a communication speed of
100Mbps, set "Communication Period Setting" to "Low-Speed".
• Configure settings with the switching hub so that the multicast frame (with
multicast MAC address 09:00:70:00:10:02 and 09:00:70:00:10:05) will not be
transferred to the port of the CC-Link IE TSN Class A remote station.
• Check the connected device and do not connect both a local station and a
CC-Link IE TSN Class A remote station on the end side of the switching hub.
• Set unicast mode.
• Connect to CC-Link IE TSN Class B devices via NZ2MHG-TSNT. (When
connecting via a general-purpose hub, change the general-purpose hub to
NZ2MHG-TSNT.)
• Restrict the number of connected stations so that the cyclic data size of the
CC-Link IE TSN Class A devices does not exceed 2K bytes in total.
• Connect the CC-Link IE TSN Class A devices to the master station.
For details, refer to the following.
Page 398 A CC-Link IE TSN Class A device does not perform data link
Comply with the restrictions of the TSN hub.
For the restrictions, refer to the manual for the TSN hub used.
• Restrict the number of connected stations so that the cyclic data size of the
100Mbps devices does not exceed 2K bytes in total.
• Connect the 100Mbps device to the master station.
• Connect the CC-Link IE TSN Class A remote station to a local station or
remote station supporting the multicast filter.
• Set unicast mode.
Update the firmware version of the master station to "02" or later.
18 TROUBLESHOOTING BY SYMPTOM
18.1 Troubleshooting Related to CC-Link IE TSN
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