Mitsubishi MELSEC-A series - Page 55

3. INSTRUCTION STRUCTURE
3 − 15
MELSEC-A
(2) If index qualification is used in a 1-step sequence instruction (such as LD, OUT),
the number of steps increases one.
Example
• When index qualification is not used:
• When index qualification is used:
REMARK
Even when index qualification is used in a 1-step sequence instruction (such as LD, OUT) with
index registers (Z1 to Z6, V1 to V6) extended by AnA, A2AS, AnU, QCPU-A (A Mode) and
A2USH board, the number of steps increases only one.
Example
LD X0 ……………....1 step
OUT Y40 ……….…..1 step
Total 2 ste
p
s
LD X0Z………………1+1=2 steps
OUT Y40…………….1 step
Total 3 steps
Index qualification
()
X000
Y040
LD X0Z3……………..1+1=2 steps
OUT Y40V6…………1+1=2 steps
Total 4 steps
()
X000
Y040
V6
( )
X000
Y040
Z
D2000Z1 D300 …. 5+1=6 steps
Total 7 steps
T1000………………..1+1=2 steps
D2000 W010Z1……5+1+1=7 steps
Total 9 steps
Extension device
T0…………………….1 step
Extension device Extension device
T1000
+ D2000 W010
LD
+
Z1
T0
+ D2000 D300
LD
+
Z1
Z3