Omron CJ2 CPU UNIT SOFTWARE User Manual page 166

5 Understanding Programming
Operand
Specifying a An index register (IR) or a data register (DR) is
register directly specified directly by specifying IR@ (@: 0 to 15) or
DR@ (@: 0 to 15).
Specifying an Indirect
indirect address
address using (No offset)
a register
Constant
offset
DR offset
Auto Incre-
ment
Auto Dec-
rement
5-74
Description
The bit or word with the PLC memory
address contained in IR@ will be
specified.
Specify ,IR@ to specify bits and words
for instruction operands.
The bit or word with the PLC memory
address in IR@ + or − the constant is
specified.
Specify +/− constant ,IR@. Constant
offsets range from −2048 to +2047
(decimal). The offset is converted to
binary data when the instruction is
executed.
The bit or word with the PLC memory
address in IR@ + the contents of DR@
is specified.
Specify DR@ ,IR@. DR (data register)
contents are treated as signed-binary
data. The contents of IR@ will be
given a negative offset if the signed
binary value is negative.
The contents of IR@ is incremented
by +1 or +2 after referencing the value
as an PLC memory address.
+1: Specify ,IR@+
+2: Specify ,IR@ + +
The contents of IR@ is decremented
by −1 or −2 after referencing the value
as an PLC memory address.
−1: Specify ,−IR@
−2: Specify ,− −IR@
Notation Application examples
IR0 MOVR 1.02 IR0
Stores the PLC memory address for
CIO 0010 in IR0.
MOVR 10 IR1
IR1
Stores the PLC memory address for
CIO 0010 in IR1.
,IR0 LD ,IR0
Loads the bit with the PLC memory
address in IR0.
MOV #0001 ,IR1
,IR1
Stores #0001 in the word with the
PLC memory in IR1.
+5 ,IR0 LD +5 ,IR0
Loads the bit with the PLC memory
address in IR0 + 5.
MOV #0001 +31 ,IR1
31 ,IR1
Stores #0001 in the word with the
PLC memory address in IR1 + 31
DR0 ,IR0 LD DR0 ,IR0
Loads the bit with the PLC memory
address in IR0 + the value in DR0.
MOV #0001 DR0 ,IR1
DR0 ,IR1
Stores #0001 in the word with the
PLC memory address in IR1 + the
value in DR0.
,IR0++ LD ,IR0 ++
Increments the contents of IR0 by 2
after the bit with the PLC memory
address in IR0 is loaded.
MOV #0001 ,IR1 +
,IR1+
Increments the contents of IR1 by 1
after #0001 is stored in the word with
the PLC memory address in IR1.
LD ,− −IR0
,--IR0
After decrementing the contents of
IR0 by 2, the bit with the PLC memory
address in IR0 is loaded.
MOV #0001 ,−IR1
,IR1
After decrementing the contents of
IR1 by 1, #0001 is stored in the word
with the PLC memory address in IR1.
CJ2 CPU Unit Software User's Manual