6 I/O Memory Areas
6-16
CJ2 CPU Unit Software User’s Manual
6-6 Special I/O Unit Area
The Special I/O Unit Area addresses range from CIO 2000 to CIO 2959 for words and CIO 2000.00 to
CIO 2959.15 for bits.
Words in the Special I/O Unit Area are allocated to Special I/O Units for data, such as the operating sta-
tus of each Unit. Each Unit is allocated 10 words based on its Unit’s unit number setting. Up to 96 Units
can be used with unit numbers 0 to 95.
Words in the Special I/O Unit Area are refreshed at the following times:
• Normal I/O refreshing
• When IORF (097) is executed
• When FIORF (225) is executed
Each Special I/O Unit is allocated 25 words based on its unit number, as shown in the following table.
The function of the 10 words allocated to a Unit depends on the Special I/O Unit being used. For
details, refer to the Unit’s operation manual.
Words in the Special I/O Unit Area that are not allocated to Special I/O Units can be used only in the
program.
Unit number Allocated words
0 CIO 2000 to CIO 2009
1 CIO 2010 to CIO 2019
2 CIO 2020 to CIO 2029
3 CIO 2030 to CIO 2039
4 CIO 2040 to CIO 2049
5 CIO 2050 to CIO 2059
6 CIO 2060 to CIO 2069
7 CIO 2070 to CIO 2079
8 CIO 2080 to CIO 2089
9 CIO 2090 to CIO 2099
10 (A) CIO 2100 to CIO 2109
11 (B) CIO 2110 to CIO 2119
12 (C) CIO 2120 to CIO 2129
13 (D) CIO 2130 to CIO 2139
14 (E) CIO 2140 to CIO 2149
15 (F) CIO 2150 to CIO 2159
16 CIO 2160 to CIO 2169
17 CIO 2170 to CIO 2179
95 CIO 2950 to CIO 2959
Special I/O Unit
CPU Unit
Special I/O Unit Area
(10 words/Unit)
Normal
I/O
refresh-
ing, IORF
(097), or
FIORF
(225)
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