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3 SPECIFICATIONS
3.4 Buffer Memory Assignments
Address
CH1
CH2
Hexade-
Hexade-
Decimal
cimal
cimal
0
0
20
H
H
1
1
21
H
H
2
2
22
H
H
3
3
23
H
H
4
4
24
H
H
5
5
25
H
H
6
6
26
H
H
7
7
27
H
H
8
8
28
H
H
9
9
29
H
H
A
10
2A
H
H
B
11
2B
H
H
C
12
2C
H
H
D
13
2D
H
H
E
14
2E
H
H
F
15
2F
H
H
10
16
30
H
H
11
17
31
H
H
12
18
32
H
H
13
19
33
H
H
14
20
34
H
H
15
21
35
H
H
16
22
36
H
H
17
23
37
H
H
18
24
38
H
H
to
to
to
1F
31
3F
H
H
1: The initial values are set when the power is turned on or the PLC CPU is reset.
3 - 8
(1) Buffer memory assignment list
Buffer memory assignments (without battery backup) for the QD62 (E/D) are
listed in the table below.
The initial values are set for the buffer memory when the power is turned on or
the PLC CPU is reset.
The contents of the buffer memory can be read/written using the FROM/TO
commands in the sequence program or the automatic refresh function of the PLC
CPU.
Decimal
32
Preset value setting
33
34
Present value
35
36
Coincidence output point set No. 1
37
38
Coincidence output point set No. 2
39
40
Overflow detection flag
41
Counter function selection setting
42
Sampling/periodic setting
43
Sampling/periodic counter flag
44
Latch count value
45
46
Sampling count value
47
48
Periodic pulse count previous value
49
50
Periodic pulse count present value
51
52
Ring counter minimum value
53
54
Ring counter maximum value
55
56
System area
to
63
Set data
MELSEC-Q
Initial
Read/write
value
1
(L)
0
Read/write enabled
(H)
(L)
0
Read only
(H)
(L)
(H)
0
Read/write enabled
(L)
(H)
0
Read only
0
Read/write enabled
(L)
(H)
(L)
(H)
0
Read only
(L)
(H)
(L)
(H)
(L)
(H)
0
Read/write enabled
(L)
(H)
—
—
3 - 8
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