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FX Series PLC User's Manual - Data Communication Edition
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7.9
QT Command [Tests Device Memory in 1-Word Units (by Writing Arbitrarily)]
This section explains the control procedure specification method and shows a specification example when the
word device memory and bit device memory (in 16-point units) are specified arbitrarily and written all at once.
Word devices and bit devices (in 16-point units) can be specified together. However, the QT command cannot
handle 32-bit word devices C200 to C255 (CN00200 to CN00255).
1. Specification method
The specification method in the control procedure format 1 is shown below:
Command for test (by writing arbitrarily in 1-word units)
E
N
Q
Computer side
PLC side
Data on
devices
(4 characters)
1) This command is available only in FX
2) Specify the device point range while satisfying the following conditions:
- 1 ≤ Number of device points ≤ 10 (in unit of 10 in case of bit devices (One unit indicates 16 points.))
3) Express the station number, PLC number, number of device points and sum check code in hexadecimal.
4) Word devices and bit devices (in 16-point units) can be specified together.
5) The QT command cannot handle 32-bit word devices C200 to C255 (CN00200 to CN00255).
2. Specification example
When writing data for setting the current value of R12000 to "1234H" and Y100 to Y117 to "BCA9H" in the
PLC whose station number is 5 (while the message waiting time is set to 0 ms)
E
N
Q
Computer side
05
PLC side
Q T
A
C
K
3U
This range is regarded as the sum check target.
0 5 F F Q T 0
0 2
R 0 1 2 0 0 0
30
35
46
46
51
57
30
30
32
52
H
H
H
H
H
H
H
H
H
H
1 0 1
Y
1
1
7
7.9 QT Command [Tests Device Memory in 1-Word Units (by Writing Arbitrarily)]
Character area A
Data on
Device
devices
(7 characters)
(4 characters)
and FX
PLCs.
3UC
1 2 3 4
30
31
32
30
30
30
31
32
33
34
H
H
H
H
H
H
H
H
H
H
This range is regarded as the
sum check target.
Y 0 0 0 1 0 0
B C A 9
59
30
30
30
31
30
30
42
H
H
H
H
H
H
H
B
C
A
1
1
1
0
0
1
0
1
0
Y
Y
1
1
1
0
0
7
7 Commands
Device
(7 characters)
H
E 3
43
41
39
45
33
H
H
H
H
H
H
A
C
0 5 F F
K
30
35
46
46
06
H
H
H
H
9
1
0
0
1
Y
Y
1
1
0
0
1
0
A
B
C
D
E
F
G
H
I
H
Apx.
D-63
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