User`s manual

249
CHAPTER 10 ON-DEMAND DATA COMMUNICATIONS USING USER FRAMES
10
10.4 On-Demand Function Control Procedure During User Frame Use
[Control procedure]
17H 0DH 0AH02H 00H
3BH
12H
34H 56H 78H
03H
02H 0DH 0AH
3BH
03HFFH,01H FFH,F0H
S
T
X
E
T
X
C
R
L
F
0
C00H
2
96H
A0H
A1H
0
1234H
5678H
256H
C00H
C01H
3ECH
0H
402H
0H
A9H
AAH
ABH
ACH
(Data name)
Programmable controller CPU
(Example)
ONDEMAND command
(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.)
ONDEMAND command complete bit
ONDEMAND command abnormal
completion bit
1 scan
External device
Added by Q series C24
User frame
Send data
First frame (1st)
User frame registration code
Send data corresponding to
registration code
Send data code
User frame
Sum check code
Last frame (1st)
Station No. Q series C24