Omron SYSMAC CS1 Operation Manual page 41

Specifications
Item
Internal I/O Area
Work Area
Holding Area
Auxiliary Area
Temporary Area
Timer Area
Counter Area
DM Area
22
4,800 (300 words): CIO 120000 to CIO 149915 (words CIO 1200 to
CIO 1499)
37,504 (2,344 words): CIO 380000 to CIO 614315 (words CIO 3800 to
CIO 6143)
These bits in the CIO Area can be used as work bits in programming to
control program execution. They cannot be used for external I/O.
8,192 bits (512 words): W00000 to W51115 (W000 to W511)
Controls the programs only. (I/O from external I/O terminals is not
possible.)
Note When using work bits in programming, use the bits in the Work Area
first before using bits from other areas.
8,192 bits (512 words): H00000 to H51115 (H000 to H511)
Holding bits are used to control the execution of the program, and
maintain their ON/OFF status when the PLC is turned OFF or the
operating mode is changed.
Note The Function Block Holding Area words are allocated from H512 to
H1535. These words can be used only for the function block
instance area (internally allocated variable area).
Read only: 7,168 bits (448 words): A00000 to A44715 (words A000 to
A447)
Read/write: 8,192 bits (512 words): A44800 to A95915 (words A448 to
A959)
Auxiliary bits are allocated specific functions.
16 bits (TR0 to TR15)
Temporary bits are used to temporarily store the ON/OFF execution
conditions at program branches.
4,096: T0000 to T4095 (used for timers only)
4,096: C0000 to C4095 (used for counters only)
32K words: D00000 to D32767
Used as a general-purpose data area for reading and writing data in
word units (16 bits). Words in the DM Area maintain their status when
the PLC is turned OFF or the operating mode is changed.
Internal Special I/O Unit DM Area: D20000 to D29599 (100 words
96 Units)
Used to set parameters for Special I/O Units.
CPU Bus Unit DM Area: D30000 to D31599 (100 words
Used to set parameters for CPU Bus Units.
Inner Board DM Area: D32000 to D32099
The CS1 Board can be accessed using software on the personal
computer.
The words in the general-purpose data area, which is used for reading
and writing data in word units (16 bits), maintain their ON/OFF status
when the power is recovered after an interruption or the operating
mode is changed.
Specification
Section 1-11
Reference
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16 Units)