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MELSEC-Q
3 SPECIFICATIONS
3.4 Buffer Memory
3.4.1 Buffer memory assignment
The following explanation is based on the Q68ADV and Q68ADI with eight channel
analog input (CH1 to CH8).
Table 3.4 Buffer memory assignment
Address Address
Hexadecimal Decimal
Description
R/W
2
Hexadecimal Decimal
Description R/W
0
H
0 A/D conversion enable/disable setting R/W 18
H
24
1
H
1 CH1 Average time/average number of times R/W 19
H
25
2
H
2 CH2 Average time/average number of times R/W 1A
H
26
3
H
3 CH3 Average time/average number of times R/W 1B
H
27
4
H
4 CH4 Average time/average number of times R/W 1C
H
28
5
H
5 CH5 Average time/average number of times 1R/W 1D
H
29
System area —
6
H
6 CH6 Average time/average number of times 1R/W 1E
H
30 CH1 Maximum value R/W
7
H
7 CH7 Average time/average number of times 1R/W 1F
H
31 CH1 Minimum value R/W
8
H
8 CH8 Average time/average number of times 1R/W 20
H
32 CH2 Maximum value R/W
9
H
9 Averaging process setting R/W 21
H
33 CH2 Minimum value R/W
A
H
10 A/D conversion completed flag R 22
H
34 CH3 Maximum value R/W
B
H
11 CH1 Digital output value R 23
H
35 CH3 Minimum value R/W
C
H
12 CH2 Digital output value R 24
H
36 CH4 Maximum value R/W
D
H
13 CH3 Digital output value R 25
H
37 CH4 Minimum value R/W
E
H
14 CH4 Digital output value R 26
H
38 CH5 Maximum value 1R/W
F
H
15 CH5 Digital output value 1R27
H
39 CH5 Minimum value 1R/W
10
H
16 CH6 Digital output value 1R28
H
40 CH6 Maximum value 1R/W
11
H
17 CH7 Digital output value 1R29
H
41 CH6 Minimum value 1R/W
12
H
18 CH8 Digital output value 1R2A
H
42 CH7 Maximum value 1R/W
13
H
19 Error code R/W 2B
H
43 CH7 Minimum value 1R/W
14
H
20 Setting range (CH1 to CH4) R 2C
H
44 CH8 Maximum value 1R/W
15
H
21 Setting range (CH5 to CH8) 1R2D
H
45 CH8 Minimum value 1R/W
16
H
22
Offset/gain setting mode
Offset specification
R/W
17
H
23
Offset/gain setting mode
Gain specification
R/W
1 When Q64AD is used, buffer memory addresses for CH5 to CH8 become blank.
2 Indicates whether reading and writing to/from a sequence program are enabled.
R : Read enabled
W : Write enabled