A-54
FX Series PLC User's Manual - Data Communication Edition
Common Items
3 Outline of Communication Setting in the FX Series
3.4 Extension of Ports (FX3U, FX3UC)
3.4.1 Limitation when ch1 and ch2 are used at the same time
When using ch1 and ch2 at the same time, available communication type combinations are limited. For
details, refer to the table below.
*1. Ch2 cannot be set for non-protocol communication (RS instruction).
*2. When using remote maintenance on ch2, use the GX Developer Ver. 8.18U or later.
Example 1:
When "parallel link" is set for ch1, the "N:N Network" cannot be set for ch2.
Example 2:
When "computer link" is set for ch1, the "N:N Network" can be set for ch2.
RD
RDA
RDB
SDA
SDB
SG
SD
Communication setting for ch1
N:N Network Parallel link
Computer
link
Inverter
communica-
tion
Non-protocol
communication
(RS instruction)
Non-protocol
communication
(RS2 instruction)
Program-
ming com-
munication
Remote
maintenance
N:N Network
Parallel link
Computer link
Inverter com-
munication
Non-protocol com-
munication (RS
instruction)
*1
Non-protocol com-
munication (RS2
instruction)
Programming com-
munication
Remote mainte-
nance
*2
Communication setting for ch2

: Applicable,
−
: Not applicable
−

−

−



−
−
(Example 1)


−




(Example 2)



−







−



   

   
  
   
− − − −
   
   
  
−
Communication channel: ch1
Expansion
board
FX
3U
/FX
3UC
PLC
Communication
channel: ch2
Communication
special adapter
Communication
special adapter
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