Mitsubishi Electric MELSEC iQ-R Series User Manual page 273

First frame (1st)
Target device
(Data name)
CPU module
(Example)
ONDEMAND command
ONDEMAND command complete bit
ONDEMAND command abnormal
complete bit
(1st first frame No.)
(2nd first frame No.)
(1st last frame No.)
(2nd last frame No.)
(Result of execution)
First frame (2nd)
User frame
02H F9H 00H 00H FFH,FFH 00H
S
T
F 9 0 0 0 0 F F 0 0
X
02H 46H 39H 30H 30H 30H 30H 46H 46H 30H 30H 31H 32H 33H 34H 35H 36H 37H 38H
Buffer memory
0
(Word units) Un\G150
(First address) C00H
Un\G160
(Data length) Un\G161 2
Un\G169 02H
3EBH
Un\G170
Un\G171 401H
Un\G172 0H
0
Un\G598
1234H
Un\G3072
(Send data)
5678H
Un\G3073
(CH1 side)
14 ON-DEMAND DATA COMMUNICATIONS USING USER FRAMES
14.3 On-Demand Function Control Procedure During User Frame Use
Added by C24
Last frame (1st)
User
frame
Send data
Sum
check
1 2 3 4 5 6 7 8
Code
H L
03H 44H 32H
1Scan
When a transmission error is
generated,
other than 0 is stored.
Sequentially transmits the data in 4-bit units,
beginning
from the most significant bit.
User frame
registration code
Send data corresponding to
registration code
Send data code
14
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