Omron SYSMAC CP Series, User Manual

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4-29
4 Understanding Programming
CP2E CPU Unit Software User’s Manual(W614)
4-6 In
de
x
Register
s
4
4-6-2 U
s
ing Inde
x Registers
The data in D0 to D99 (augend data) is added to the data in D100 to D199 (addend data) and the addi-
tion results are output to D200 to D299. The operands of a single addition instruction are specified by
index registers and the addition operations are performed by incrementing the index registers and
repeatedly executing the addition instruction.
Additional Information
Index Registers can be directly addressed only in the instructions shown in the following table.
Application Example for Index Registers
MOVR
D0
IR0
a
MOVR
D100
IR1
MOVR
D200
IR2
FOR
&100
+
,IR0+
,IR1+
,IR2+
a
NEXT
JME
&50
JMP
&50
MOVR(560) s et s the PLC memory a ddre ss e s of D0, D100, a nd D200 in
index regi s ter s IR0, IR1, a nd IR2.
The au gend d a t a (indirectly a ddre ss ed b y IR0+) i s a dded to the a ddend
d a t a (indirectly a ddre ss ed b y IR1+) with the S IGNED BINARY ADD
WITHOUT CARRY in s tr u ction (+(400)) a nd the re su lt i s o u tp u t to the word
indirectly a ddre ss ed b y IR2+.
Index regi s ter s IR0+, IR1+, a nd IR2+ a re au tom a tic a lly incremented a fter
b eing referenced in the +(400) in s tr u ction.
Repe a ted 100 time s .
When exec u tion condition “a” goe s ON
( u pw a rdly differenti a ted condition), the
PLC memory a ddre ss e s of D0, D100,
a nd D200 a re s et in index regi s ter s IR0,
IR1, a nd IR2.
The following FOR-NEXT loop i s not
exec u ted u nle ss exec u tion condition “a”
i s u pw a rdly differenti a ted (OFF
→
ON).
S t a rt loop.
If exec u tion condition “a” i s ON, the
word indirectly a ddre ss ed b y IR0
( au to-incremented) a nd the word
indirectly a ddre ss ed b y IR1
( au to-incremented) a re a dded as 4-digit
s igned hex a decim a l v a l u e s a nd the
re su lt i s o u tp u t to the word indirectly
a ddre ss ed b y IR2 ( au to-incremented).
Ret u rn to FOR a nd repe a t loop.
J u mp de s tin a tion when exec u tion
condition “a” i s not u pw a rdly
differenti a ted (OFF
→
ON).
Exec u tion condition
Exec u tion condition