Precautions - Mitsubishi Electric MELSEC iQ-R Series User Manual

Precautions

Addition of slave stations (including a submaster station)
Add/remove slave stations one by one. If multiple slave stations are added/removed at a time, all stations on the network will
be reconnected, and an error may momentarily occur in all the stations.
If a slave station (including a submaster station) is added to a system having 120 slave stations (including a submaster
station), the system operates as follows.
■When the firmware version of the master station is "05" or later
Baton pass and data link are not performed in the slave stations (including a submaster station) added after the 121st station,
and other stations continues baton pass and data link.
Even if the disconnected stations are returned to a system having 121 or more slave stations (including a submaster station),
the stations may not start data link.
• Whether 121 or more slave stations (including a submaster station) are connected can be checked using
'Number of connected modules over occurrence status' (SB0099). Number of connected modules detected
by 'Number of connected modules over occurrence status' (SB0099) is the total of the slave stations
(including a submaster station) which are currently connected and the disconnected stations (slave stations
which were previously connected).
• The number of stations which were previously connected can be cleared 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
All stations will fail and data link cannot be performed.
Incorrectly configured ring topology
Do not use a switching hub for ring topology.
Ring topology
When using a ring topology, select "Ring" in the following setting for the master station.
[Navigation window]  [Parameter]  [Module Information]  Target module  [Basic Settings]  [Network Topology]
5 SYSTEM CONFIGURATION
5.3 CC-Link IE Field Network Configuration
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