Omron SYSMAC CS Series Operation Manual page 449

I/O Memory Areas
Auxiliary Area (AR)
Temporary Relay Area (TR)
Data Memory Area (DM)
The Auxiliary Area contains flags and control bits used to monitor and control
PLC operation. This area is divided into two parts: A000 to A447 are read-
only and A448 to A959 can be read or written. Refer to 9-16 Auxiliary Area for
details on the Auxiliary Area.
Note The undefined addresses of the Auxiliary Area may be allocated to functions
in future version upgrades of the CPU Unit. Do not use these words as CIO
Area words in the user program.
The TR Area contains bits that record the ON/OFF status of program
branches. The TR bits are used with mnemonics only.
The DM Area is a multi-purpose data area that can be accessed in word-units
only. These words retain their content when the PLC is turned on or the oper-
ating mode is switched between PROGRAM mode and RUN or MONITOR
mode.
Word
D00000
D20000
D29599
D30000
D31599
D32000
D32767
Word
15
Read-only area
A447
A448
Read-write area
A959
D06032 to D06063: C200H
DeviceNet Status Area
Special I/O Unit Area
(10 words/Unit)
CPU Bus Unit Area
(100 words/Unit)
Inner Board Area
Section 9-2
Bit
411