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6
DATA COMMUNICATION USING THE NON PROCEDURE PROTOCOL
Programmable
controller
CPU
Q25HCPU
Reception
MODE.
abnormal
RUN.
ERR.
detection
USER.
BAT.
BOOT.
INPUT
instruction
USB
RS-232
Q series C24 ready (X1E)
Reception data read request (X3)
Reception abnormal detection (X4)
INPUT instruction
INPUT instruction complete device
INPUT instruction complete device + 1
(normal completion/abnormal
completion)
Receive data count (address: 600
Receive data (addresses: 601
6 - 21
Q series C24
Receive area
(buffer memory)
Receive data
3
count storage
(00
)
(03
area
H
H
A
STX
Receive data
(41
)
(02
H
H
storage area
C
B
(43
)
(42
H
H
E
D
(45
)
(44
H
H
)
H
n
to)
H
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.
Reception error causing data
Head data
)
)
STX
B
A
(02
) (41
)
(42
)
(43
)
H
H
H
)
Transmission data
INPUT
ERR LED lights up
Reception abnormal
detection data
Data reception
Receive
complete code
C
D
E
F
G
H ETX
)
(44
)
(45
)
(46
)
(47
)
(48
)
(03
)
H
H
H
H
H
H
H
1 scan
3
Receive data
MELSEC-Q
External device
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Troubleshooting
