Omron CS1D DUPLEX SYSTEM - 10-2009 Operation Manual page 294

I/O Memory Areas
Extended Data Memory
Area (EM)
Timer Area
Timer Completion Flags
Timer PVs
Counter Area
258
Word
D00000
D20000
D29599
D30000
D31599
D32000
D32767
The EM Area is a multi-purpose data area that can be accessed in word-units
only (16-bit words). 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.
The EM Area is divided into 32,767-word regions called banks. The number of
EM banks depends upon the model of CPU Unit, with a maximum of 13 banks
(0 to C). Refer to 2-1 Specifications for details on the number of EM banks
provided in each model of CPU Unit.
Word
E0_00000
E0_32767
There are two timer data areas, the Timer Completion Flags and the Timer
Present Values (PVs). Up to 4,096 timers with timer numbers T0000 to T4095
can be used. The same number is used to access a timer's Completion Flag
and PV.
These flags are read as bits. A Completion Flag is turned ON by the system
when the corresponding timer times out (the set time elapses).
The PVs are read and written as words (16 bits). The PVs count up or down
as the timer operates.
There are two counter data areas, the Counter Completion Flags and the
Counter Present Values (PVs). Up to 4,096 counters with counter numbers
C0000 to C4095 can be used. The same number is used to access a
counter's Completion Flag and PV.
Special I/O Unit Area
(100 words/Unit)
CPU Bus Unit Area
(100 words/Unit)
Inner Board Area
Word
EC_00000
EC_32767
Section 8-2