User`s manual

247
CHAPTER 10 ON-DEMAND DATA COMMUNICATIONS USING USER FRAMES
10
10.4 On-Demand Function Control Procedure During User Frame Use
[Control procedure]
03H 44H 32H
HL
03H FFH,F1H
30H 30H 31H 32H 33H 34H 35H 36H 37H 38H46H46H30H30H30H30H39H46H02H
00 12345678FF00009F
00HFFH,FFH00H00HF9H02H
E
T
X
S
T
X
0
C00H
2
96H
A0H
A1H
0
1234H
5678H
256H
C00H
C01H
02H
3EBH
401H
0H
A9H
AAH
ABH
ACH
(Data name)
Programmable controller CPU
(Example)
External device
ONDEMAND command
Added by Q series C24
User
frame
First frame (2nd)
Last frame (1st)
User frame registration code
Send data corresponding to
registration code
Send data code
First frame (1st)
Buffer memory
(Data length)
(First address)
(Word units)
(CH1 side)
(Result of execution)
(Send data)
Sequentially transmits the data in 4-bit units, beginning
from the most significant bit.
When a transmission error is generated,
other than 0 is stored.
(1st first frame No.)
(2nd first frame No.)
(1st last frame No.)
(2nd last frame No.)
User frame Send data
ONDEMAND command complete bit
ONDEMAND command abnormal
complete bit
1 scan
Sum check Code