Mitsubishi MELSEC L Series User Manual page 234

External device
(Data name)
Programmable controller CPU
(Example)
ONDEMAND command
ONDEMAND command complete bit
ONDEMAND command abnormal
complete bit
10 - 5
[Control procedure]
First frame (1st)
First frame (2nd)
User frame
02 F9 00
H H H
S
T F 9 0 0 0
X
02 46 39 30 30 30
H H H H H
(Word units)
(First address)
(Data length)
(1st first frame No.)
(2nd first frame No.)
(1st last frame No.)
(2nd last frame No.)
(Result of execution) 256
C00
(Send data)
C01
(CH1 side)
10 ON-DEMAND DATA COMMUNICATIONS USING USER FRAMES
Added by Q series C24
Send data
00 00
H FF , FF H
H H
0 F F 0 0 1 2 3 4 5 6 7 8
30 46 46 30 30 31 32 33 34 35 36
H H H H H H H H H H H
Buffer memory
0
96
H
A0 C00
H H
2
A1
H
A9 02
H H
AA 3EB
H
H
401
AB
H H
AC 0
H H
0
H
1234
H Sequentially transmits the data in 4-bit units, beginning
H
from the most significant bit.
5678
H
H
Last frame (1st)
User
frame
User frame registration code
03
FFH,F1H
H
E
Send data corresponding to
T
registration code
X
H L
Send data code
37 38 03 44 32
H H H H H H
1 scan
When a transmission error is generated,
other than 0 is stored.
10 - 5