D-62
FX Series PLC User's Manual - Data Communication Edition
Computer Link
7 Commands
7.3 QR Command [Reads Device Memory in 1-Word Units]
7.3
QR Command [Reads Device Memory in 1-Word Units]
This section explains the control procedure specification method and specification examples when the word
device memory is read all at once or when the bit device memory is read (in 16-point units) all at once.
This command is available only in FX
3S
, FX
3G
, FX
3GC
,
FX
3U
and FX
3UC
PLCs.
1. Specification method
The specification method in the control procedure format 1 is shown below:
1) Specify the device point range while satisfying the following conditions:
- 1
Number of device points
64 (32 for bit devices)
- Head device Number of device points ("Number of devices
16" for bit devices) -1
Maximum device number
- When 32-bit devices (CN00200 to CN00255) are read, one device point is handled as two word data.
Accordingly, up to 32 device points can be specified.
2) Express the station number, PLC number, number of device points and sum check code in hexadecimal.
2. Specification examples (For FX
3U
and FX
3UC
PLCs)
Example 1: When reading the contents of thirty-two devices from X040 to X077 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
S
T
X
E
T
X
QR
Head device
(7 characters)
Data on
specified
number of
device points
A
C
K
Character area A
One device uses 4 characters.
Four digits (hexadecimal)
express one data word .
Number of device points
(2 characters (hexadecimal)
Batch read command
(unit: word)
Character area B
Read device range
specification
St
at
io
n
No.
PLC No.
Sum check
code
Message wait time
St
at
io
n
No.
PLC No.
St
at
io
n
No.
PL
C No
.
Sum check
code
A
C
K
0 5 F F
E
T
X
C 8
S
T
X
0 5 F F
1 2 3 4
A B C D
0 2 A 2
E
N
Q
0 5 F F Q R 0
This range is regarded as the sum
check target.
This range is regarded as the
sum check target.
35
H
30
H
46
H
46
H
52
H
51
H
30
H
58
H
30
H
30
H
30
H
30
H
32
H
30
H
32
H
41
H
05
H
35
H
30
H
46
H
46
H
02
H
38
H
43
H
03
H
35
H
30
H
46
H
46
H
06
H
31
H
34
H
33
H
32
H
41
H
44
H
43
H
42
H
0 0 0
0
1
0
1
0
1
0
0
0
1
1
1
1
1
1
0
0
1
0
1
0
1
0
0 0
1
1
1
0
X
0
6
0
1
2
D
C
B
A
4
3
X
0
6
1
X
0
6
7
X
0
7
0
X
0
7
7
X
0
4
0
X
0
4
1
X
0
4
7
X
0
5
0
X
0
5
7
Computer side
PLC side
X 0 0 0 0
34
H
4
30
H
0
Summary of Contents for FX-485ADP
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