Mitsubishi MELSEC QJ71C24, User Manual

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MELSEC-Q
6 DATA COMMUNICATION USING THE NON PROCEDURE PROTOCOL
Reception
abnormal
detection
Receive area
(buffer memory)
Receive data
count storage
area
STX
D
(02
H
)
(44
H
)
B
(42
H
)
(03
H
)
A
(41
H
)
E
(45
H
)
C
(43
H
)
(00
H
)
STX A B C D E F G H ETX
Head data
Receive
complete code
(02
H
) (41
H
) (48
H
) (47
H
) (46
H
) (45
H
) (44
H
) (43
H
) (42
H
) (03
H
)
Transmission data
External device
Reception error causing data
RUN .
ERR.
USER .
BAT.
BOOT .
RS-232
USB
Q25HCPU
MODE .
3
Q series C24
INPUT
instruction
Receive data
storage area
Programmable
controller
CPU
Q series C24 ready (X1E)
Reception data read request (X3)
Reception abnormal detection (X4)
INPUT instruction
INPUT instruction complete device
INPUT instruction complete 1
(normal completion/abnormal
completion)
Receive data count (address: 600
H
)
Receive data (addresses: 601
H
to)
INPUT
Receive data
Data reception
1 scan
ERR LED lights up
Reception abnormal
detection data
n
3
When the data from "G" to in the reception message shown in the figure above is
received normally, the data is stored in the Q series C24 OS area.
The receive data stored in the OS area will be read to the programmable controller
CPU in the succeeding read operation.