FX
3U
Series Programmable Controllers
User’s Manual - MODBUS Serial Communication Edition
3 System Configuration
3.3 Limitation when Channel 1 and Channel 2 are used at the
3.3
Limitation when Channel 1 and Channel 2 are used at the same time
When using Channel 1 (ch1) and Channel 2 (ch2) at the same time, the available communication type combinations are limited. For more details, refer to the table below.
1
2
Communication channel: ch2
Communication channel: ch1
RD
SD
RDA
RDB
SDA
SDB
SG
3
Communication special adapter
Communication special adapter
Expansion board
FX
3U
PLC
4
MODBUS
Serial Communication
MODBUS Serial
Communication
N:N Networking
Parallel Link
Computer Link
Inverter
Communication
Non-protocol
Communication
(RS2 instruction)
Programming
Communication
Remote
Maintenance
*2
3: Applicable
-: Not applicable
-
(Example 1)
3
(Example 2)
3
3
3
3
3
3
N:N
Networking
3
-
-
3
3
3
3
3
Parallel Link
3
-
-
3
3
3
3
3
Communication Setting on Ch1
Computer
Link
Inverter Communication
Non-protocol
Communication (RS instruction)
Non-protocol
Communication (RS2 instruction)
Programming
Communication
Remote
Maintenance
3 3 3 3 3 3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
*1.
Ch2 cannot be set for non-protocol communication using the RS instruction.
*2.
When using remote maintenance on ch2, use GX Developer Ver. 8.18U or later.
3
3
3
3
3
3
3
3
3
3
3
3
3
-
Example1:
When using "MODBUS Serial Communication" on ch1, "MODBUS Serial Communication" can not be set on ch2.
Example2:
When using "MODBUS Serial Communication" on ch1, "N:N Networking" can be used on ch2.
→ For more details on using N:N Networking and MODBUS Serial Communication, refer to Section
5.3.
5
6
7
8
9
10
19
