Precautions For System Configuration - Mitsubishi Electric MELSEC iQ-R RD78G4 User Manual

5.3

Precautions for System Configuration

Devices connected to the same network
Do not connect the devices as described below. Doing so may cause the disconnection of all stations.
• The devices having network types other than CC-Link IE TSN and Ethernet (such as CC-Link IE Controller Network and
CC-Link IE Field Network) are connected to the same network line.
• The modules on CC-Link IE TSN and Ethernet devices (such as personal computers) in various networks are connected to
one switching hub.
Adding 65 or more slave stations
If 64 slave stations are already connected and further slave stations are added, data link will not be performed in the added
65th and subsequent slave stations, but the other stations will continue data link.
Even if the disconnected stations are returned to a system having 65 or more slave stations, the stations may not start data
link.
• Whether 65 or more slave 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 slave stations that are currently connected and
the disconnected stations (slave stations that were previously connected).
• The number of stations that were previously connected can be cleared by executing the network map
update of the CC-Link IE TSN/CC-Link IE Field diagnostics. ( MELSEC iQ-R Motion Module User's
Manual (Network))
• 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.
Ensure that the output data is held, if necessary. (Page 36 Output hold when a data link error occurs)
Station number of the slave station to be added
Do not duplicate station numbers. Data link may be stopped when the station number is duplicated.
Adding a slave station with no IP address setting
In line topology, do not connect the slave station with no IP address setting at a place other than the end of the line. Data link
may not be performed in the slave stations after the slave station with no IP address setting.
CC-Link IE TSN/CC-Link IE Field diagnostics
If operations such as the following are performed, the actual network configuration and the network map of the CC-Link IE
TSN/CC-Link IE Field diagnostics may be a mismatch.
Network configuration
Star topology
Line topology
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 Precautions for System Configuration
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