Auxiliary Area (A); Data Memory Area (D); Timer Area (T); Counter Area (C) - Omron CP1L-EL20DR-D Operation Manual

Overview of I/O Memory Area

Auxiliary Area (A)

Temporary Relay Area
(TR)

Data Memory Area (D)

Timer Area (T)

Counter Area (C)

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.
Word
A447
A448
A959
The TR Area contains bits that record the ON/OFF status of program
branches. Refer to the CP1H/CP1L 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
MONITOR mode.
CPU Unit with 30 or 40 I/O Points
Bit
15
D0
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).
Timer PVs
The PVs are read and written as words (16 bits). The PVs count up or down
as the timer operates.
There are two parts to the Counter Area: the Counter Completion Flags and
the Counter Present Values (PVs). Up to 4,096 counters with counter num-
bers C0 to C4095 can be used.
Counter Completion Flags
These flags are read as individual bits. A Completion Flag is turned ON by the
system when the corresponding counter counts out (i.e., when the set value is
reached).
15
Read-only area
Read-write area
CPU Unit with 20 I/O Points
0 15
Bit
D0
D9999
D32000
D32767
Section 4-1
Bit
0
107