I
•
4. A2CCPU
--------------------
MELSEC-A
No.
Name
Function
(6)
RD LED
The
data
receiving
state
indicator
LED
(receiving
from
1/0
modules
and
remote
terminal
modules)
•
ON:
The
A2C is
receiving
data from an I/O module or remote terminal module
correctly.
•
OFF:
The
RD LED
goes
out
in
the
following
cases.
• The
A2.C
is not receiving
data
from an 1/0
module
or terminal module.
• Cable connecting to the ADA or ROB terminal is
broken
or connection at
the
terminal
is 100s8.
• Hardware faulty of the A2C,
va
modu le,
and/or
remote terminal module.
(7)
Cover
1 A2CCPU
cover
I
• The
cover
protecting the A2C PCBs, EP-ROM. batteryI etc.
•
Open
cover
1 to
carry
out
following
operations:
• Installing
and
removing an EP-ROM.
• Setting
for
used memory (IC-RAM/EP-ROM)
• Connecting battery
connector
•
Changing
battery
Note:
Before
opening
or
closing
cover
1,
remove
the
RUN key
switch
and
RS-422
connector.
(8)
Cover
2 RS-422
cover
I
•
The
cover
for
the
RS-422
connector
used
to
connect
a
peripheral
device
to
the
A2C.
(9)
Terminal
block
Terminal
block
for
connecting
external
devices
to
the
A2C.
I
•
The
terminals
used
to
connect
the
following
devices:
• 100/200 VAC power
supply
• I/O
modules
and remote
terminal
modules
•
Grounding
cable
•
Chenging
input
voltage (100/200 VAC).
4-79
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