Hitachi PLC - Page 8

7
n Internal I/O
Internal I/O (R, WR, M, WM, etc.) means data memory. This data memory area can be read or
written freely for flags, parameters, set point values or calculation depending on your program.
* Refer to the chapter “Programming” for further information about TD, CU, DIF and DFN.
Note : “R” and “WR/DR” are physically separated memory areas.
[ M, L ]
Note : “M”, “WM” and “DM” are in one common memory area. (L/WL/DL as well.)
WR 0
WR 1 WR 2
DR 0
DR 1
DR 2
No bit access No bit access No bit access
R
0
R
1
R
2
R
3
R
4
R
5
R
6
R
7
R
8
R
9
R
A
R
B
R
C
R
D
R
E
R
F
R
10
R
11
R
12
R
13
R
14
R
15
R
16
R
17
R
18
R
19
R
1A
R
1B
R
1C
R
1D
R
1E
R
1F
R
20
R
21
M
0
WM 0
M
1
M
2
M
D
M
E
M
F
M
10
WM 1
M
11
M
12
M
1D
M
1E
M
1F
M
20
WM 2
M
21
M
22
M
2D
M
2E
M
2F
DM 0
DM 1
DM 2
Note : “L” is available only for the LINK module
[ R, WR ]