Mitsubishi FX3U-232-BD User Manual page 466

FX Series PLC User's Manual - Data Communication Edition
Non-Protocol Communication (RS/RS2 Instruction)
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) 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
FX , FX , FX
1S 1N
FX , FX (FX), FX
0N 2
3. Setting data flow
Setting window
Sequence
program for
set values
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.
F-28
FX Series
FX FX , FX FX
2N, 3U, 1NC 2NC,
2C
PLC memory
Parameter area
Parameter
method
Program area
[MOV H
[MOV K
In FX and FX
3U
[MOV H
Program
[MOV K
method
[MOV H
[MOV K
5 Communication Setting in FX Programmable Controller
(FX), FX
2
Specification using
parameters
(Recommended)
3UC
—
Transferred
when power
is turned ON
Written by
D8120]
program
D8129]
Written by
3UC
program
D8400]
D8409]
Written by
program
D8420]
D8429]
When both methods are selected at the same time, priority is
given to the contents set in the parameter method.
5.1 Communication Setting Method Mechanism
, and FX PLCs.)
2C 0N
Specification by writing settings
data to special data registers
RS instruction
D8120 Communication format
D8129 Time-out time setting
In FX and FX
3U 3UC
ch1 RS2 instruction
D8400 Communication format
D8409 Time-out time setting
ch2 RS2 instruction
D8420 Communication format
D8429 Time-out time setting