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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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