Mitsubishi MELSEC-A series, Programming Manual

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APP - 31
APPENDICES
Table 1.4 Special Register List (Continue)
Number Name Description Details Applicable CPU
D9173 Mode setting
0: Automatic online
return enabled
1: Automatic online
return disabled
2: Transmission
stop at online
error
3: Line check
Mode setting
—
Usable with
A2C and A52G.
0 Auto-
matic
online
return
enabled • When an I/O module or a remote
terminal module caused communication
error, the station is placed offline.
• Communication with normal stations is
continued.
• The station recovering from a
communication error automatically
resumes communication.
1 Auto-
matic
online
return
disabled • When an I/O module or a remote
terminal module caused communication
error, the station is placed offline.
• Communication with normal stations is
continued.
• Though a faulty station returned to
normal, communication is not restored
unless the station module is restarted.
2 Trans-
mission
stop at
online
error • When an I/O module or a remote
terminal module caused communication
error, communication with all stations is
stopped.
• Though a faulty station returned to
normal, communication is not restored
unless the station module is restarted.
3 Line
check • Checks hardware and connecting cables
of I/O modules and remote terminal
modules.
D9174
Setting of the
number of
retries
Number of retries
• Sets the number of retries executed to I/O modules
and remote terminal modules which caused
communication error.
• Set for 5 times at power on.
• Set range: 0 to 32
• If communication with an I/O module or a remote
terminal module is not restored to normal after set
number of retries, such module is regarded as a faulty
station.
—
Usable with
A2C and A52G.
D9175
Line error retry
counter
Number of retries
• Stores the number of retries executed at line error
(time out).
• Data becomes 0 when line is restored to normal and
communication with I/O modules and remote terminal
modules is resumed.
—
Usable with
A2C and A52G.
D9180
Remote
terminal module
error number
Remote terminal
number
• Stores error code of a faulty remote terminal module
when M9060 is turned on.
• The error code storage areas for each remote terminal
module are as shown below.
• Error code is cleared in the following cases.
• When the RUN key switch is moved from STOP to
RUN.
(D9180 to D9183 are all cleared.)
• When Yn4 of each remote terminal is set from OFF to
ON.
—
Usable with
A2C and A52G.
D9181
D9182
D9183
D9184
D9185
D9186
D9187
D9188
D9189
D9190
D9191
D9192
D9193
D9180
D9181
D9192
D9193
Remote terminal module No.1
D9182
..
.
Remote
terminal
module
numbers
from 1 to 14
are set with
D9020 to
D9034.
Remote terminal module No.2
Remote terminal module No.3
Remote terminal module No.13
Remote terminal module No.14