I
•
•
4.A2CCPU
--------------------
MELSEC-A
(a) Initial setting error
1)
If an initial setting error occurs,
the
settings are reset to the
defaults (see below) to execute communications with a remote
I/O module.
Item
DefaUlt
Total
number
of stations 64 stations
Number
of remote terminal stations 0
Mode
Automatic online return supported
2) After correcting the initial setting data, reset the A2C using
the
RUN key switch or change the operation status from STOP to
RUN.
Communications
are
executed
with
the
remote
I/O
modules and remote terminal modules
according
to
the
newly
set initial setting data.
(b) Processing at an occurrence of disconnected line error
1) When a disconnected line error occurs,
outputs
are determined
according
to
the
communication
mode
and
the
setting
for
processing at an occurrence of communication error.
The output state varies between the stations preceding and
succeeding the cable disconnection
point
or power OFF remote
station.
Line Error due to
Cable
Disconnection Line Error due to
Remote
Station
Power OFF
I A2C
(
I A2C
(
I
No.2
I
I
No.1
I
I
No.2
I
I
No.1
I
~
~
j
~
j
~
-r-.
Cable
r L Power OFF
disconnection
Item Output Processing at an Occurrence of Communication Error
Communication mode (M9069)
Output
OFF (M9069 : OFF)
Output by
sequence
program
(M9069 : ON)
No.1
OFF
Results of
sequence
program operation
are output
Automatic online
return provided
• A2C I/O
module:
OFF
No.2
• Remote
I/O
module for MINI-S3 :
Depends
on EC
mode
Automatic online
No.1
• A2C I/O
module:
OFF
return not provided
No.2
• Remote I/O module for
MINI-S3
:
Depends
on EC mode
No.1
• A2C I/O
module:
OFF
Communication stop
No.2
• Remote I/O module for MINlwS3 : Depends on EC
mode
4-45
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