83
Specifications Section 2-1
Work Area 8,192 bits (512 words): W00000 to W51115 (W000 to W511)
Controls the programs only. (I/O from external I/O terminals is not pos-
sible.)
Note When using work bits in programming, use the bits in the Work
Area first before using bits from other areas.
9-2-2 Overview of the
Data Areas
9-7 Serial PLC Link
Area
Holding Area 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).
9-2-2 Overview of the
Data Areas
9-10 Holding Area
Auxiliary 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.
9-2-2 Overview of the
Data Areas
9-11 Auxiliary Area
Temporary Area 16 bits (TR0 to TR15)
Temporary bits are used to temporarily store the ON/OFF execution
conditions at program branches.
9-2-2 Overview of the
Data Areas
9-12 TR (Temporary
Relay) Area
Timer Area 4,096: T0000 to T4095 (used for timers only) 9-2-2 Overview of the
Data Areas
9-13 Timer Area
Counter Area 4,096: C0000 to C4095 (used for counters only) 9-2-2 Overview of the
Data Areas
9-14 Counter Area
DM Area 32 Kwords: 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 × 16 Units)
Used to set parameters for CPU Bus Units.
9-2-2 Overview of the
Data Areas
9-15 Data Memory
(DM) Area
EM Area (CJ1-H and
CJ1 CPU Units only)
32 Kwords per bank, 7 banks max.: E0_00000 to E6_32767 max.
(depending on model of CPU Unit)
Used as a general-purpose data area for reading and writing data in
word units (16 bits). Words in the EM Area maintain their status when
the PLC is turned OFF or the operating mode is changed.
The EM Area is divided into banks, and the addresses can be set by
either of the following methods.
Changing the current bank using the EMBC(281) instruction and set-
ting addresses for the current bank.
Setting bank numbers and addresses directly.
EM data can be stored in files by specifying the number of the first
bank.
9-2-2 Overview of the
Data Areas
9-16 Extended Data
Memory (EM) Area
Index Registers IR0 to IR15
Store PLC memory addresses for indirect addressing. Index registers
can be used independently in each task. One register is 32 bits (2
words).
CJ1-H and CJ1M CPU Units: Setting to use index registers either
independently in each task or to share them between tasks.
CJ1 CPU Units: Index registers used independently in each task.
9-17 Index Registers
Programming Manual:
6-2 Index Registers
Item Specifi
cations Reference
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