Precautions When Ethernet Cables Are Used - Mitsubishi Electric MELSEC iQ-R Series User Manual

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Precautions when Ethernet cables are used

Addition of the normal stations
Add/remove normal 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 normal station is added to a system having 119 normal stations, the system operates as follows.
■When the firmware version of the control station is "05" or later
Baton pass and data link are not performed in the normal station added after the 120th station, and other stations continues
baton pass and data link.
Even if the disconnected stations are returned to a system having 120 or more normal stations, the stations may not start data
link.
• Whether 120 or more normal stations 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 normal stations which are currently connected
and the disconnected stations (normal 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 Controller Network diagnostics. ( MELSEC iQ-R CC-Link IE Controller
Network User's Manual (Application))
• A data link error may be momentarily detected in all the stations since all stations on the network will be
reconnected when executing the network map update.
■When the firmware version of the control 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 control station.
[Navigation window]  [Parameter]  [Module Information]  Target module  [Basic Settings]  [Network Topology]
5 SYSTEM CONFIGURATION
5.2 CC-Link IE Controller Network Configuration
5
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