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MELSEC-Q
3 SPECIFICATIONS
3.4 Buffer Memory Assignments
(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 programmable controller 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
programmable controller CPU.
Address
CH1 CH2
Hexadecimal Decimal Hexadecimal Decimal
Set data
Initial value
1
Read/write
0H 0 20H 32 (L)
1H 1 21H 33
Preset value setting
(H)
0
Read/write
enabled
2H 2 22H 34 (L)
3H 3 23H 35
Present value
(H)
0 Read only
4H 4 24H 36 (L)
5H 5 25H 37
Coincidence output point set No. 1
(H)
6H 6 26H 38 (L)
7H 7 27H 39
Coincidence output point set No. 2
(H)
0
Read/write
enabled
8H 8 28H 40 Overflow detection flag 0 Read only
9H 9 29H 41 Counter function selection setting
AH 10 2AH 42 Sampling/periodic setting
0
Read/write
enabled
BH 11 2BH 43 Sampling/periodic counter flag
CH 12 2CH 44 (L)
DH 13 2DH 45
Latch count value
(H)
EH 14 2EH 46 (L)
FH 15 2FH 47
Sampling count value
(H)
10H 16 30H 48 (L)
11H 17 31H 49
Periodic pulse count previous value
(H)
12H 18 32H 50 (L)
13H 19 33H 51
Periodic pulse count present value
(H)
0 Read only
14H 20 34H 52 (L)
15H 21 35H 53
Ring counter minimum value
(H)
16H 22 36H 54 (L)
17H 23 37H 55
Ring counter maximum value
(H)
0
Read/write
enabled
18H
to
1F
H
24
to
31
38
H
to
3F
H
56
to
63
System area — —
1: The initial values are set when the power is turned on or the programmable controller CPU is reset.
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