Mitsubishi Electric FX3U-ENET-ADP, Руководство пользователя

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7 Communication Using MC Protocol
58
FX
3U
-ENET-ADP User's Manual
7.3 Message Formats and Control Procedures
7.3.4 Character area transmission data
This section explains how to transmit the bit device data and word device data handled in the character areas,
as well as the order of transmission when communicating data between an external device and the PLC by
each command.
The transmission data shown in the examples is contained in character area B when reading, and in
character area C when writing, testing.
1) Data communication using ASCII code
a) When reading from or writing to a bit device memory
The bit device memory can be read and written in bit units (one device point) or word units (16 device
points).
How data is transmitted in each case is explained below.
• Bit units (one point)
In case of bit units, the bit device memory is handled from the designated head device for the
number of designated device points sequentially from the left. They are expressed as "1" (31H) if
the device is on or "0" (30H) if the device is off.
(Example)
Indicating the ON/OFF status of five points from M10
• Word units (16 points)
When the bit device memory is handled as word units, each word is expressed in hexadecimal
values in 4-bit units sequentially from the higher bit.
(Example)
Indicating the ON/OFF status of 32 points from M16
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
0
30
H
0
30
H
A
41
H
0
30
H
5
35
H
1
31
H
0
30
H
1
31
H
0
30
H
1
31
H
0
30
H
0
30
H
0
30
H
0
30
H
44
H
D
34
H
4
L L H H
2
32
H
0
30
H
0
30
H
Head device
Device
point
Data
0
30
H
0
30
H
A
41
H
B
42
H
1
31
H
2
32
H
3
33
H
4
34
H
C
43
H
D
44
H
1
31
H
0
30
H
0
30
H
2
32
H
B15
1 0 1 0 1 0 1 1 0 0 0 1 0 0 1 0 0 0 1 1
B14 B13 B12B11B10B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
0 1 0 0 1 1 0 0 1 1 0 1
B15 B14 B13 B12 B11B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
A B 1 2 3 4 C D
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
30
H
0
30
H
0
32
H
2
44
H
D
– – – – – – – – – –
34
H
4
L H
0
30
H
0
30
H
0
30
H
Head device
Device
point
Data Data
The device point is "02" in 16-point units.
1: Indicates ON
0: Indicates OFF
M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M M