Mitsubishi FX3U-232-BD User Manual page 275

FX Series PLC User's Manual - Data Communication Edition
Computer Link
IMPORTANT
Do not use the on-demand function when the system configuration is not 1-to-1 type.
If the on-demand function is used in the multi-drop link system in which the computer and PLC CPUs have
the 1-to-N configuration, the transfer data and on-demand send data in the control procedure format 1 or 4
are destroyed, and normal data sending is not possible.
2. Specification example 1
When sending the data stored in the data registers D100 and D101 by a trigger from a sequence program
(when the station number is 0 and the data unit to be sent is set to "word")
Computer side
PLC side
M8127
PLC
On-demand
command [1]
Sequence program example
M8000
X000 M8002
0
M0 M8127
3
7
M8127 M8128
33
M8128
40
The PLC number "FE" is automatically added by the PLC.
S
T 0 0
X
30 30
02
H H
H
Writes data to be
sent and amount of
data to be sent.
D8127 100 M8128
D8128 2 M8129
[2]
D100
D101
M8129
PLS M0
MOV H1234 D100
MOV H5678 D101
RST M8128
RST Y000
RST Y001
MOV K100 D8127
MOV K2 D8128
SET Y000
SET Y001
END
F E 1 2 3 4 5 6 7 8
46 45 31 32 33 34 35 36 37 38
H H H H H H H H H H
ON/OFF
OFF
1234H
5678H
The data unit is set to "word" value.
........
The startup command is the pulse operation
........
type.
........ Data to be sent is set.
The on-demand error flag is reset.
(The on-demand function is disabled while
........
M8128 is ON.)
The head device number storing the data to be
........ sent and the amount of data are specified, and
the on-demand function is started up.
On-demand error is checked for, and the check
........
result is output.
M8128 OFF:
ON:
7 Commands
7.13 On-demand Function
E
T 9 2
X
03 39 32
H H H
It turns ON when an error is
included in the specified
value for sending.
Data is sent in 4-bit units
starting from highest-order bits.
Data is sent normally.
Data is not sent because an
error occurred.
A
B
C
D
E
F
G
H
I
Apx.
D-73