Data Memory Area (D) - Omron CP1L Operation Manual

Data Memory Area (D)

4-10 Data Memory Area (D)
Forcing Bit Status
Indirect Addressing
160
CPU Units with 30, 40 or 60 I/O points: D0 to D32767
CPU Units with 10, 14 or 20 I/O points: D0 to D9999 and D32000 to D32767
CPU Unit with 30, 40 or 60 I/O Points
D0
D32199
D32200
DM Fixed Allocation
Words for Modbus-RTU
Easy Master
D32399
D32400
D32767
This data area is used for general data storage and manipulation and is
accessible only by word.
Data in the DM Area is retained when the PLC's power is cycled or the PLC's
operating mode is changed from PROGRAM mode to RUN/MONITOR mode
or vice-versa.
Although bits in the DM Area cannot be accessed directly, the status of these
bits can be accessed with the BIT TEST instructions, TST(350) and
TSTN(351).
Bits in the DM Area cannot be force-set or force-reset.
Words in the DM Area can be indirectly addressed in two ways: binary-mode
and BCD-mode.
Binary-mode Addressing (@D)
When a "@" character is input before a DM address, the content of that DM
word is treated as binary and the instruction will operate on the DM word at
that binary address. The entire DM Area (D0 to D32767) can be indirectly
addressed with hexadecimal values 0000 to 7FFF.
0100
@D100
BCD-mode Addressing (*D)
When a "*" character is input before a DM address, the content of that DM
word is treated as BCD and the instruction will operate on the DM word at that
BCD address. Only part of the DM Area (D0 to D09999) can be indirectly
addressed with BCD values 0000 to 9999.
*D100
0100
Note (1) If an address between D10000 and D31999 is specified as an operand
for a CPU Unit with 10, 14 or 20 I/O Points, an illegal area access error
will occur.
CPU Unit with 10, 14 or 20 I/O Points
D0
D9999
D10000
D31999
D32000
D32199
D32200
D32399
D32400
D32767
D256
Address actually used.
D100
Address actually used.
Section 4-10
Do not use.
DM Fixed Allocation
Words for Modbus-RTU
Easy Master