5 Replacement from FX3U to FX5U
5.4 Conversion of the Projects
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5
Serial Communication Channel Assignment (RS-485, RS-232C)
When the FX3U is replaced with the FX5U, the communication channel assignments that can be used change.
Change the communication channels specified with instructions and parameter settings so that these channels match the
specifications.
■FX3U communication channel assignment
A communication function expansion board and a special communication adapter can be used to connect up to two channels
of serial ports.
The configurable combinations are shown below.
■FX5U communication channel assignment
The built-in RS-485 port, a communication board, and a communication adapter can be used to connect up to four channels
of serial ports.
The communication channel assignments are fixed regardless of the system configuration.
When a communication function expansion board connected to the FX3U is replaced with an FX5U communication board, the
communication channel changes from CH1 to CH2.
[Configuration example 1] [Configuration example 2]
Using a communication function expansion board and a
special communication adapter at the same time
Using two special communication adapters
CH1: Communication function expansion board
CH2: Special communication adapter
FX3U-CNV-BD
CH1: Special communication adapter
CH2: Special communication adapter
CH2: Communication board
CH1: Built-in RS-485 port
CH3: Communication adapter
CH4: Communication adapter
CH2: Communication board
CH1: Communication function
Expansion board
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