Data Memory (Dm) Area - Omron SYSMAC CS1D-PD Series Operation Manual

Data Memory (DM) Area

Instruction name
COUNTER: CNT or
CNTX
REVERSIBLE
COUNTER: CNTR(012)
548)
or CNTRX(
COUNTER WAIT:
CNTW(814) or
CNTWX(818)

8-15 Data Memory (DM) Area

Forcing Bit Status
Indirect Addressing
322
The following table shows when counter PVs and Completion Flags will be
reset.
Reset Mode
change
PV → 0000
Maintained
Flag → OFF
The DM Area contains 32,768 words with addresses ranging from D00000 to
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 (D00000 to D32767) can be indi-
rectly addressed with hexadecimal values 0000 to 7FFF.
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 (D00000 to D09999) can be indirectly
addressed with BCD values 0000 to 9999.
Effect on PV and Completion Flag
PLC startup Reset Input
Maintained Reset
@D00100 0100
Address actually used.
*D00100
0100
Address actually used.
Section 8-15
CNR(545) or Interlocks
CNRX(548) (IL-ILC)
Reset Maintained
D00256
D00100