Mitsubishi MELSEC LJ71C24, User Manual

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10 DATA COMMUNICATION USING THE NONPROCEDURAL PROTOCOL
STX
D
(02H)
(44H)
B
(42H)
(03H
A
(41H)
E
(45H)
C
(43H)
(00H)
STX A B C D E F G H ETX
(02H) (41H) (48H) (47H) (46H) (45H) (44H) (43H) (42H) (03H)
3
Receive complete
code
External device
Head data
Transmission data
C24
Receive area
(buffer memory)
Receive data
count
Receive data
Reception
abnormal
detection
INPUT
instruction
CPU module
Reception error causing data
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 turns on
Reception abnormal
detection data
n
3
When the data of "G" or later in the reception message shown in the figure above is
received normally, the data is stored in the C24 OS area.
The receive data stored in the OS area will be read to the CPU module in the next
read operation.