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APPENDICES
- - - - - - - - - - - - - - - - - - - MELSEC·A
Table 2.1 List of Special Relays (Continued)
Related
Number
Name
Description
Details
Special
Regloter.
• Switched ON when one of I/O modules has
become faulty. (Communication error is
detected when normal communication Is not
restored after the number of retries set with
09174
I/O module
OFF:
Normal
09174.)
09196
Moo67
fault
ON :
Fault
• Switched OFF when normal communication
10
detection
with all I/O module is restored with automatic
09199
return enable.
Remains ON without automatic return.
If communication is stopped at fault
detection, this is not switched ON/OFF.
• For setting OFF/ON of all outputs at an
Processing at
OFF : All outputs are
occurrence of communication error.
.OFF: All outputs are turned OFF at
M9069
communication
turned OFF
communication error.
-
error
ON : Normal output.
.ON
:
Output status at an occurrence of
communication error is retained.
OFF: Communication
• For determining enable/disable of
Communication
request to remote
communication request to remote terminal
request to
terminal modules
modules using the [FROMITO] instructions.
enabled.
MooBl
remote
ON : Communication
-
terminal
modules
request to remote
terminal modules
disabled.
• Switched ON when the final station number of
remote I/O modules or remote terminal
OFF: Final station
modules connected to the A2C is different from
Final station
number matched.
the total number of stations of initial
M90B2
number
ON : Final station
setting.
090B2
unmatched
number
• Switched OFF When the final station number
unmatched.
is same as the total number of stations when
the operation status is switched from STOP to
RUN.
OFF: ERR terminals
• Turned ON when output from the ERR
*2
ERR terminal
OFF
terminals is executed by the sequence
M90B9
output
ON : ERR terminals
program.
-
• Turned ON when both M9089 and M9090 are
ON
OFF.
OFF: ERR terminals
• Turned ON at
MINI~S3
link errors or sequence
M9090
ERR terminal
OFF
program errors (at operation stop)
output
• Turned OFF when MINI-S3 link or sequence
-
ON : ERR terminals ON
program is restored to normal.
APP-9

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