6. BASIC INSTRUCTIONS
6
−
86
MELSEC-A
Execution
(1) EI/DI instructions are not used
Conditions
(2) EI instruction is used
(3) EI/DI instructions are used
Sequence
processing
Sequence
processing
Sequence
processing
I/O refresh
E
N
D
processi
ng
Wa
it
f
o
r
constant scan
I/O refresh
E
N
D
processi
ng
Wa
it
f
o
r
constant scan
I/O refresh
Sequence
processing
Sequence
processing
Sequence
processing
I/O refresh
E
N
D
processi
ng
Wa
it
f
o
r
constant scan
I/O refresh
E
N
D
processi
ng
Wa
it
f
o
r
constant scan
I/O refresh
DI in
-
str
u
ction
DI in
-
str
u
ction
DI in
-
str
u
ction
Sequence
processing
Sequence
processing
Sequence
processing
I/O refresh
E
N
D
processi
ng
Wa
it
f
o
r
constant scan
I/O refresh
E
N
D
processi
ng
Wa
it
f
o
r
constant scan
I/O refresh
DI in
-
str
u
ction
DI in
-
str
u
ction
DI in
-
str
u
ction
EI
in
-
str
u
ction
EI
in
-
str
u
ction
EI
in
-
str
u
ction
*:
•
indicates that link
processing is possible.
•
There is no wait period
for constant scan when
the constant scan facility
is not specified.
•
There is no I/O refresh
time in direct mode.
Summary of Contents for MELSEC-A series
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