Mitsubishi Electric MELSEC iQ-R Series User Manual page 61

Connecting/disconnecting a cable and powering off/on a device
When the operations listed below are performed, the following will occur depending on the firmware version of the control
station.
Network configuration
Star topology
Line topology, ring topology
■When the firmware version of the master station is "05" or later
The actual network configuration and the network map of the CC-Link IE Field Network diagnostics may be a mismatch.
Whether mismatch is occurred or not can be checked using 'Network configuration mismatch occurrence status' (SB0098).
When using a ring topology, the following may be occurred.
• The station number of the loopback station cannot be detected correctly.
• Even if a switching hub is used, data link does not stop.
The actual network configuration and network map can be matched by executing the network map update of
the CC-Link IE Field Network diagnostics. ( MELSEC iQ-R CC-Link IE Field Network User's Manual
(Application))
A data link error may momentarily occur in all the stations and outputs of the connected slave stations may
turn off since all stations on the network will be reconnected when executing the network map update. Set
output data if needed. ( Page 59 Output hold when a data link error occurs)
■When the firmware version of the master station is "04" or earlier
A data link error may momentarily occur in all the stations and outputs of the connected slave stations may turn off since all
stations on the network will be reconnected. Set output data if needed. ( Page 59 Output hold when a data link error
occurs)
Output hold when a data link error occurs
Setting the following allows to hold the outputs when a data link error occurs.
■Master/local module
Select the "Hold" in the following setting.
[Navigation window]  [Parameter]  [Module Information]  Target module  [Application Settings] 
[Supplementary Cyclic Settings]  [I/O Maintenance Settings]  [Data Link Error Station Setting]
■For a head module whose serial number (first five digits) is "12071" or earlier
Select the "Hold" in the following setting using GX Works2.
Project window  [Parameter]  [PLC Parameter]  [I/O Assignment]  [Detailed Setting] button  [Error Time Output
Mode]
This setting is not required for a head module whose serial number (first five digits) is "12072" or later.)
Connected station numbers
Do not duplicate station numbers. Data link may be stopped when the station number is duplicated.
Operation
• Powering off and on a slave station or switching hub
• Connecting/disconnecting an Ethernet cable connected to the switching hub
• Disconnecting an Ethernet cable from a slave station and connecting it to another slave station or a switching hub
• Disconnecting more than 9 stations, or half the number of slave stations or more in the system
• Changing the network topology when adding a slave station
• Simultaneously powering off/on multiple stations
• Simultaneously connecting/disconnecting Ethernet cables to/from multiple stations (When a data link faulty station
returns, a data link error will occur in all the stations.)
• Disconnecting more than 9 stations, or half the number of slave stations or more in the system
• Changing the network topology when adding a slave station
5 SYSTEM CONFIGURATION
5.3 CC-Link IE Field Network Configuration
5
59