A-85
Appendices
NJ-series CPU Unit Software User’s Manual (W501)
A-6 Contents of Memory Used for CJ-series Units
App
A-6-1 CIO Area
A-6 Contents of Memory Used for CJ-
series Units
You can specify addresses in the memory used for CJ-series Units for AT specifications for variables.
Details on each area are provided below.
Description
The bits in this area are allocated to input and output terminals on CJ-series Basic I/O Units. The
number of words (16 bits each) that is required for each CJ-series Basic I/O Unit are allocated in
order based on the position where the Units are connected (from left to right starting from the Unit
that is closest to the CPU Unit). Data in this area is cleared when power is cycled or when the oper-
ating mode is changed between PROGRAM and RUN mode.
Addresses
You can access this area on NJ-series CPU Units through device variables allocated to I/O ports.
We therefore recommend that you do not use AT specifications to access this area. You should
use AT specifications for the CIO Area only when you specify addresses for some of the Special
Units.
Description
The bits in this area are allocated to control and status information for CJ-series CPU Bus Units.
Each Unit is allocated 25 words based on its unit number. Data in this area is cleared when power is
cycled or when the operating mode is changed between PROGRAM and RUN mode.
Addresses
The words that are allocated are listed in the following table.
A-6-1 CIO Area
I/O Bits
Addresses Word addresses Bit addresses
Range CIO 0 to CIO 159 0.00 to 159.15
CPU Bus Unit Area
Addresses Word addresses Bit addresses Words per Unit
Range CIO 1500 to CIO 1899 CIO 1500.00 to CIO 1899.15 25 words
Word addresses Unit Number
CIO 1500 to CIO 1524 0
CIO 1525 to CIO 1549 1
to to
CIO 1875 to CIO 1899 F
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