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5.2.3
Precautions
This section describes the precautions regarding the CC-Link IE Field Network configurations.
(1) Adding slave stations (including the submaster 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.
(a) When a serial number (first five digits) of the master station is "17022" or later
Baton pass and data link are not performed in the slave stations (including the submaster stations) 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.
Remark
●
Whether 121 or more slave stations (including a submaster station) are connected can be checked using the following.
• "Selected Station Communication Status Monitor" of CC-Link IE Field diagnostics (
• 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. (
Page 214, Section 9.3) 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. (
(b) When a serial number (first five digits) of the master station is "17021" or earlier
All stations will fail and data link cannot be performed.
(2) Connecting devices to the same network
Do not connect an Ethernet device (e.g. personal computer) other than CC-Link IE Field Network device to the
switching hub used on CC-Link IE Field Network. Doing so will cause timeout in the master station, resulting in
disconnection of all the stations.
(3) Configuration in which data link cannot be performed (incorrectly configured
ring topology)
Do not wire devices as shown below. Doing so will cause an error in all stations and data link cannot be performed.