Mitsubishi MELSEC LJ71C24, User Manual

Page: 176 / 428

10 - 26 10 - 26
10 DATA COMMUNICATION USING THE NONPROCEDURAL PROTOCOL
10.2 Sending Data to the External Device
This section explains data transmission from the CPU module to the external device.
10.2.1 Transmission methods
The following shows how to send data in any format using the nonprocedural protocol.
Transmission area
(buffer memory)
STX A B C D E F G H ETX
Transmission data
(02
H
) (41
H
) (48
H
) (47
H
) (46
H
) (45
H
) (44
H
) (43
H
) (42
H
) (03
H
)
A
(41
H
)
G
(47
H
)
E
(45
H
)
C
(43
H
)
STX
B
D
F
H
(02
H
)
(48
H
)
(46
H
)
(44
H
)
(42
H
)
ETX
(03
H
)
10
(0A
H
) (00
H
)
3)
Transmission data
ETX H
(03
H
) (48
H
) (41
H
) (03
H
)
External device
A STX
1) 2)
OUTPUT instruction
C24
Transmission
data count
Transmission
data
CPU module
OUTPUT instruction
completion device
OUTPUT instruction
OUTPUT
Transmission instruction
Contents CH1/CH2 Control timing
1) Transmission data is stored in the device designated with the OUTPUT instruction.
2) Control data is stored in the device designated with the OUTPUT instruction.
3) When the OUTPUT instruction is executed, the C24 sends the amount of data
designated by the transmission data count from the transmission data area to the
external device in ascending order of the transmission data area addresses.