D-58
FX Series PLC User's Manual - Data Communication Edition
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7 Commands
7.6 QW Command [Writes Device Memory in 1-Word Units]
7.6 QW Command [Writes Device Memory in 1-Word Units]
This section explains the control procedure specification method and shows a specification examples when
the word device memory is written all at once or when the bit device memory is written (in 16-point units) all at
once.
1. Specification method
The specification method in the control procedure format 1 is shown below:
1) This command is available only in FX
3U and FX3UC PLCs.
2) Specify the device point range while satisfying the following conditions:
-1 ≤ Number of device points ≤ 64 (10 in case of bit devices)
- Head device number + Number of device points ("Number of devices × 16" in case of bit devices) -1 ≤
Maximum device number
- When 32-bit devices (CN00200 to CN00255) are written, one device point is handled as two word data.
Accordingly, up to 32 device points can be specified.
3) Express the station number, PLC number, number of device points and sum check code in hexadecimal.
2. Specification examples
Example 1: When writing data to thirty-two devices from M640 to M671 in the PLC whose station number is
5 (while the message waiting time is set to 0 ms)
Computer side
PLC side
E
N
Q
QW
Head device
(7 characters)
A
C
K
Character area C
One device uses 4 characters. Four digits
(hexadecimal) express one data word.
Number of device points
(2 characters (hexadecimal)
Batch write command
(unit: word)
Written device range
specification
Data on
specified
number of
device points
Station
No.
PLC No.
Sum check
code
Message
wait time
Station
No.
PLC No.
A
C
K
0 5 F F
0 2 6 4
E
N
Q
0 5 F F Q W 0
This range is regarded as the
sum check target.
35
H
30
H
46
H
46
H
57
H
51
H
30
H
4D
H
36
H
32
H
34
H
36
H
05
H
35
H
30
H
46
H
46
H
06
H
0 0 1 0111001000 0100100110110 0 1111 1
M
6
5
6
23 69BA74
M
6
5
7
M
6
6
3
M
6
6
4
M
6
7
1
M
6
4
0
M
6
4
1
M
6
4
7
M
6
4
8
M
6
5
6
Computer side
PLC side
M0 0 06
34
H
40
32
H
41
H
37
H
34
H
33
H
2347A
42
H
B
39
H
96
36
H
30
H
30
H
30
H
30
H
30
H
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