4. A2CCPU
MELSEC-A
I
•
No. Name
Function
(2)
Indicator
LEOs LEOs
indication
operation
status
and
error
occurrence
status
of
A2CCPUP21/A21
LED Description LED Description
L.AUN
Lit when data
link
Is normal ·1 POWER Lit when power is turned ON.
L.SD
LIt
while
data
are
being
sent. "2
RUN
Lit
when
the RUN key
switch
is
set
in
RUN.
L.RD Lit while data are being received. "3 Em::>! LIt at an occurrence of PC CPU error.
Not
used
(Always
OFF) "4
SO
Lit
during
sending
In MININET.
eRe
Lit at an
occurrence
of
code
check
error.
"5 RO Lit
during
receiving
In MININET.
OVER
Lit at an occurrence of
data
entry delay
error.
AS.IF
Lit when all data are "1,"
TIME
Lit at an occurrence of tfme-out error.
DATA
Lit at an
occurrence
of
receive
data
F.lOOP
Lit when
data
receive
line
is forward
error.
loop.
L.RUN
'00'
POWER
UNDER
lit
at an
occurrence
of
send
data
error.
CPU RIW Lit
during
communications
with
PC CPU.
F.LOOP
Lit at an occurrence of forward loop
L.SD
00
RUN
receive
data
error.
I
L.RD
00
ERROR
R.lOOP
Litat an occurrence of reverse
tccp
00
solMINiI
receive
data
error.
cec
00
RO
1
10
OVER
00
2
Indicates the lowest
dIgit
number of the
20
Indicates
the
second
lowest
digit
AB.IF
00
number
of the
station
number
in BCD.
4
station
number
In BCD.
40
TIME
00
DATA
00
F.
LOOP
S
UNDER
00
CPU
R/W
F.LOOP
00
(1) • The LEDs (L.RUN to 8) in the left side
indieetethe
MELSECNET data link
R.LOOP
00
1
00
10
operation
status.
For
details,
refer
to the
MELSECNET
(II) Data
Link
2
00
20
Reference
Manual.
4
00
40
8
00
(2) *1
POWER LED
for
5
VDe
power
indication
ON:
100 V 1200 VAC power is
supplied
to the A2C,
and
it is
converted
normally
to 5 VDC
inside
the
A2C.
OFF:
100
V 1200 VAC
power
is
not
supplied
to
the
A2C.
100
V 1200 VAC
power
is
not
converted
to 5 VDC.
(3)
*2
RUN LED
indicating
A2C
operating
status
Lit (ON) :
A
sequence
program
operation
is
being
executed
with
the
RUN key
switch
set
in
the
RUN
position.
The
LED
remains
lit
if an error,
which
permits
sequence
program
operation
to
continue,
occurs.
See
Section
4.10
.
Unlit
(OFF) :
The
RUN LED
goes
out
in
the
following
cases.
• 100/200 VAC is not supplied to the A2C.
• The RUN key
switch
is in
the
STOP
position.
•
The
remote
STOP
signal
is
input.
See
Section
4.2.3.
•
The
remote
PAUSE
signal
is
input.
See
Section
4.2.4.
Flicker
:
The
RUN LED
flickers
in
the
following
cases.
• An
error
which
causes
sequence
program
operation
to
stop
is
detected
by
the
self-diagnosis
function.
•
The
latch
clear
operation
is
executed.
See
Section
4.2.2.
4-85
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