4.A2CCPU
MELSEC·A
No.
Name
Function
(2)
Indicator
LEOs
(4) *3
ERROR LED
indicating
error
detection
status by
the
self-diagnosis
function
Lit (ON) :
An error Is detected
by
the
self-diagnosis
function.
The LED remains OFF when an error,
for
which
the LED
should
remain OFF
is
set
by the priority setting, is detected.
Unlit
(OFF) :
The A2C is
running
correctly.
Flicker:
The
ennunciator
(F) is set ON by
the
sequence program.
(5) *4
SO LED
indicating
data
sending
status to I/O
modules
and remote
terminal
modules
Lit (ON) :
The A2C is
sending
data
to an I/O
module
or remote
terminal
module
correctly.
Unlit
(OFF) :
The SO LEO
goes
out
in
the
following
cases.
• Data are not
being
sent to an I/O
module
or remote
terminal
module.
• There is an
error
in
the
initial
data
or in
the
initial
program.
• The A2C hardware is faulty.
(6)
*5
RD LED
indicating
data
receiving status from I/O
modules
and
remote
terminal
modules
Lit
(ON) :
The A2C is receiving
data
from
an I/O
module
or remote terminal
module
correctly.
Unlit
(OFF) :
The RD LED goes
out
in
the
following
cases.
• Data are not
being
received from an 110
module
or remote
terminal
module.
•
Cable
connecting
to
the
RDA or ROB terminal Is broken or
connection
at the terminal is loose.
• Faulty hardware of A2C, I/O module,
and/or
remote terminal module.
4-86
I
•
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