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I/O data types
Hitachi PLC's handles the following I/O.
External
Input
I/Os
Output
Normal memory
Shared memory
Link memory
Internal
Timer (TD,SS, etc.)
I/Os
Counter (CU, etc.)
Edge detection á
Edge detection â
Note : [D] ... Decimal (ex. 00,01,...,09,10,...,15,16,17,18,19,20,21,...)
[H] ... Hexadecimal (ex. 00,01,...,09,0A,0B,...0F,10,11,...1F,20,21,...)
n Bit, Word and Double Word
Double Word consists of 2 Words, and 1 Word consists of 16 bits as below.
Word (16 bits)
B
B
B
B
B
B
i
i
i
i
i
i
t
t
t
t
t
t
15
14
13
12
11
10
Example : WR 0 = H'1234, WR 1 = H'5678 è DR 0 = H'5678 1234
n External I/O
External I/Os (X, Y, WX, WY, etc.) are direct addresses for each digital input/output module or analog
input/output module. Please note bit I/Os X and Y are decimal expression.
(WX/WY can be used as access command or data for high function modules like the counter
module.)
WX 0
X
X
X
0
1
2
(for Digital data, etc)
X ¨¨¨¨ [D]
Y ¨¨¨¨ [D]
R ¨¨¨¨ [H]
M ¨¨¨¨ [H]
L ¨¨¨¨ [H]
TD ¨¨¨ [D]
CU ¨¨¨ [D]
DIF ¨¨¨ [D]
DFN ¨¨¨ [D]
B
B
B
B
B
B
B
i
i
i
i
i
i
i
t
t
t
t
t
t
t
9
8
7
6
5
4
3
Double Word (32 bits)
X
X
X
X
X
X
13
14
15
16
17
18
DX 0
Bit
(for Analog data, etc)
WX ¨¨¨ [H]
WY ¨¨¨ [H]
WR ¨¨¨ [H]
WM ¨¨¨ [H]
WL ¨¨¨ [H]
B
B
B
B
B
B
B
i
i
i
i
i
i
i
t
t
t
t
t
t
t
2
1
0
15
14
13
12
WR 1 WR 0
DX 1
WX 1
X
X
X
X
29
30
31
32
6
Word
Double Word
DX ¨¨¨ [H]
DY ¨¨¨ [H]
DR ¨¨¨ [H]
DM ¨¨¨ [H]
DL ¨¨¨ [H]
-
-
-
-
B
B
B
B
B
B
B
i
i
i
i
i
i
i
t
t
t
t
t
t
t
11
10
9
8
7
6
5
WX 2
X
X
X
33
34
45
-
-
-
-
B
B
B
B
B
i
i
i
i
i
t
t
t
t
t
4
3
2
1
0
X
X
46
47
DX 2
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