F-34
FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (RS/RS2 Instruction)
5 Communication Setting in FX Programmable Controller
5.1 Communication Setting Method Mechanism
5. Communication Setting in FX Programmable Controller
This chapter explains the communication setting types and setting methods for non-protocol communication
using RS instruction.
5.1 Communication Setting Method Mechanism
This section explains the communication setting method types and setting procedures in FX PLCs.
1. Setting method types
1) Specifying the setting using parameters:
Set the parameters by adjusting communication settings on the personal computer screen using the
sequence programming software, and transfer them to a PLC.
(This method using parameters is not available in FX
2(FX), FX2C, and FX0N PLCs.)
(This method using parameters is not available for ch0 in FX
3G PLCs.)
2) Specifying the settings by writing data to special data registers:
Prepare a sequence program which sets the communication format and time-out time setting, and then
transfer the program to the PLC.
Caution
A PLC operates in the same way without regard to a selected method shown above. If both methods are
selected, priority is given to the method using parameters.
2. Communication setting method applicability in each FX Series
3. Setting data flow
4. Time at which the settings become valid
1) When specifying the settings by parameters
When the PLC power is turned ON, the contents of parameters set on the parameter setting window
using sequence programming software are automatically transferred to D8120, D8129, D8400, D8409,
D8420 and D8429 in the PLC.
As soon as the parameters are transferred to the PLC, the settings become valid.
After the program parameters are transferred to the PLC, it is necessary to turn OFF the PLC power
once, and then turn it ON again.
FX Series
Specification using
parameters
Specification by writing settings
data to special data registers
FX
1S, FX1N, FX2N, FX3G (ch1, ch2),
FX
3U, FX1NC, FX2NC, FX3UC
(Recommended)
FX
0N, FX2(FX), FX2C, FX3G (ch0) —
Communication format
Sequence
program for
set values
Parameter area
Program area
Setting window
Parameter
method
Program
method
[MOV H D8120]
[MOV K D8129]
D8120
D8129
D8400
D8409
D8420
D8429
Communication format
Time-out time setting
Time-out time setting
Communication format
Communication format
Time-out time setting
Transferred
when power
is turned ON
Written by
program
RS instruction
ch1 RS2 instruction
ch2 RS2 instruction
Written by
program
Written by
program
Written by
program
PLC memory
When both methods are selected at the same time, priority is
given to the contents set in the parameter method.
Ch0 is available only
in the FX
3G PLC.
The setting method
using parameters cannot
be used for ch0.
D8370
D8379 Time-out time setting
ch0RS2 instruction
[MOV H D8400]
[MOV K D8409]
[MOV H D8420]
[MOV K D8429]
[MOV H D8370]
[MOV K D8379]
In FX
3G,
FX
3U
and FX
3UC
In FX3G, FX3U and FX3UC
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