Mitsubishi Melsec-L Series User Manual page 30

(2) Number of branch line levels
Up to two branch line levels can be configured in a CC-Link/LT system.
Three or more branch line levels cannot be configured.
(3) Installation conditions of a dedicated power supply and a power supply
adapter
The installation conditions of the power supplies depend on the connected devices and wiring length.
For the conditions, refer to the user's manual for the dedicated power supply or the power supply adapter.
Always connect a dedicated power supply or a power supply adapter to the trunk line. (Connection to branch lines is not
allowed.)
(4) Preventing incorrect input/output from remote I/O modules
To prevent incorrect input/output from remote I/O modules, design a system with considering the following:
(a) At power-on and power-off
Turn on the power of remote I/O modules (dedicated power supply or power supply adapter), then start data
link.
Also, stop data link then turn off the power of remote I/O modules.
Master module
(Data link status)
Remote I/O module
(Power status)
28
Remote
station
Remote
station
The third branch line level cannot be configured.
Remote
station
Data link start
Executed
Stopped
ON
OFF
Trunk line
Branch line
Data link stop