Omron CP1H CPU Operation Manual page 180

Overview of I/O Memory Area
Auxiliary Area (A)
Temporary Relay Area
(TR)
Data Memory Area (D)
Timer Area (T)
146
Note H512 to H1535 are used as a Function Block Holding Area. These words can
be used only for function block instances (internally allocated variable area).
These words cannot be specified as instruction operands in the user program.
These words are allocated to specific functions in the system.
Refer to Appendix C Auxiliary Area Allocations by Function and Appendix D
Auxiliary Area Allocations by Address for details on the Auxiliary Area.
The TR Area contains bits that record the ON/OFF status of program
branches. Refer to the CP1H Programming Manual for details.
The DM Area is a multi-purpose data area that is normally accessed only in
word-units. These words retain their content when the PLC is turned ON or
the operating mode is switched between PROGRAM mode and RUN or MON-
ITOR mode.
Word
D00000
D20000
D29599
D30000
D31599
D32767
There are two parts to the Timer Area: the Timer Completion Flags and the
timer Present Values (PVs). Up to 4,096 timers with timer numbers T0 to
T4095 can be used.
Timer Completion Flags
These flags are read as individual bits. A Completion Flag is turned ON by the
system when the corresponding timer times out (i.e., when the set time
elapses).
Word 15
Read-only area
A447
A448
Read-write area
A959
Special I/O Unit DM Area
(100 words/Unit)
CPU Bus Unit DM Area
(100 words/Unit)
Section 4-1
Bit