6-15
6 I/O Memory Areas
CJ2 CPU Unit Software User’s Manual
6-5 CPU Bus Unit Area
6
6-5 CPU Bus Unit Area
The CPU Bus Unit Area addresses range from CIO 1500 to CIO 1899 for words and CIO 1500.00 to
CIO 1899.15 for bits.
Words in the CPU Bus Unit Area are allocated to CPU Bus Units to transfer data, such as the operating
status of the Unit. Each Unit is allocated 25 words based on the Unit’s unit number setting.
Data is exchanged with CPU Bus Units at the following times.
• During the I/O refresh period
• When DLNK(226)) is executed
Each CPU Bus Unit is allocated 25 words based on its unit number, as shown in the following table.
The function of the 25 words depends on the CPU Bus Unit being used. For details, refer to the Unit’s
operation manual.
Words in the CPU Bus Unit Area that are not allocated to CPU Bus Units can be used only in the pro-
gram.
Unit number Allocated words
0 CIO 1500 to CIO 1524
1 CIO 1525 to CIO 1549
2 CIO 1550 to CIO 1574
3 CIO 1575 to CIO 1599
4 CIO 1600 to CIO 1624
5 CIO 1625 to CIO 1649
6 CIO 1650 to CIO 1674
7 CIO 1675 to CIO 1699
8 CIO 1700 to CIO 1724
9 CIO 1725 to CIO 1749
A CIO 1750 to CIO 1774
B CIO 1775 to CIO 1799
C CIO 1800 to CIO 1824
D CIO 1825 to CIO 1849
E CIO 1850 to CIO 1874
F CIO 1875 to CIO 1899
CPU Bus Unit
CPU Unit
CPU Bus Unit Area
(25 words/Unit)
I/O
refresh-
ing
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