Communication Setting Method Using Sequence Program - Mitsubishi Electric FX3U-232-BD User Manual

FX Series PLC User's Manual - Data Communication Edition
Computer Link
9.3

Communication Setting Method Using Sequence Program

When adjusting the communication setting using a sequence program, transfer values to D8120
(communication format), D8121 (station number settings) and D8129 (time-out time setting), and then turn
the power ON.
This section explains the communication setting method using a sequence program.
9.3.1 Setting procedure
Perform the following procedure to set the communication using a sequence program.
1
Creating a program using a programming tool
Create the program shown below using a programming tool.
M8000
M8002
Initial pulse
2
Writing the sequence program to the PLC
Transfer the created program to the PLC.
3
Setting the PLC mode to RUN
Set the PLC to RUN mode, and execute the program.
4
Turning the PLC power OFF and then ON
Turn OFF the PLC power, and then turn it to ON so that the communication setting becomes valid.
9.3.2 Caution on communication setting using sequence program
1) Do not set the communication using a sequence program and parameters at the same time.
If the communication is set using both methods at the same time, priority is given to the setting using
parameters.
2) Since the special data registers (D8120, D8121, D8129) is a battery backed area in the case of the FX
FX , FX
2NC
a battery error occurs).
Therefore, keep in mind that a computer link setting may not be possible in this case.
D-98
FNC 12
MOV
FNC 12
MOV
FNC 12
MOV
and FX series, a value cannot be normally saved when the battery is discharge (or after
3U 3UC
9.3 Communication Setting Method Using Sequence Program
M8120
This step is required only in FX
H6082 D8120
The communication format is set.
H0 D8121
The station number is set.
K1 D8129
The time-out time setting is set.
For details on these devices, refer to Section 9.2.
9 Related Data
PLC.
0N
,
2N