Mitsubishi FX3U-232-BD User Manual page 249

FX Series PLC User's Manual - Data Communication Edition
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6.6 Transfer Data in Character Area
This section explains the transfer data in the character area sent and received between the computer and a
PLC using each command.
The transfer data explained below is handled as the character area B in reading and the character area C in
writing.
6.6.1 When bit device memory is read or written
The bit device memory is handled in 1-bit (1-point)
The transfer data in each case is explained below.
1) In 1-bit (1-point)
When the bit device memory is handled in 1-bit (1-point) units, a specified number of devices starting
from the specified head device are expressed in turn from the left end in "1 (31H)" for the ON status or "0
(30H)" for the OFF status.
Example: When indicating the ON/OFF status of five devices starting from M10
Head device
M
4D 30
H
2) In 1-word (16-point)" units
When the bit device memory is handled in 1-word (16-point) units, one word is expressed in 4-bit units in
turn from the most significant bit in hexadecimal.
Example: When indicating the ON/OFF status of 32 devices starting from M16
A
b15 b14 b13
1 0 1
M M
31 30
units
Number
of
devices
0 0 1 0 0 5 1 0
31 30
30 31 30 30 35
H H
H H H H H H
Number
Head device
of
devices
M 0 0 1 6 0
4D
30 30 31 36 30 32
H
H H H H H
B 1
b12 b11 b10 b9 b8 b7 b6 b5 b4
0 1 0 1 1 0 0 0 1
M M M M M M M M M M
29 28 27 26 25 24 23 22 21 20
→ For character areas, refer to Subsections 6.4.1 and 6.4.2.
or in 1-word (16-point)
units
1 0 1
31 30 31
H H H
Indicates that M14 is ON.
Indicates that M13 is OFF.
Indicates that M12 is ON.
Indicates that M11 is OFF.
Indicates that M10 is ON.
Because devices are handled in 16 point units,
the number of device is "02".
Data Data
2 A B 1 2 3 4 C
41 42 31 32 33 34 43 44
H H H H H H H
H
2 3 4
b3 b2 b1 b0 b15 b14 b13 b12 b11 b10
0 0 1 0 0 0 1 1 0 1
M M M M M M M M M M
19 18 17 16 47 46 45 44 43 42
6 Control Procedures and Setting Methods
6.6 Transfer Data in Character Area
.
units
D
H
C D
b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
0 0 1 1 0 0 1 1 0 1
M M M M M M M M M M
41 40 39 38 37 36 35 34 33 32
A
B
C
D
E
F
G
H
I
Apx.
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