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4.
A2CcPU
/MELSEC-A
Total number of stations
The total number of stations
is
set to determine the range
for
UO
refresh.
Set
the
last
station number
of
remote
VO
modules or
remote terminal modules connected to the A2C.
If the last station (remote
UO
module or remote terminal
module) occupies
two
or more stations, this number of
stations must be taken into account. If the setting
is
required for station number
"10"
remote
I/O
module which
occupies
4
stations, for example, the setting for the total
number of stations
is
"13".
WO
refresh
is
executed for up to the remote module
assigned with the station number which
is
set
as
the total
number of stations.
If the setting for the total number of stations
is
"20", for
example,
I/O
refresh
is
executed for remote
I/O
modules
and remote terminal modules whose station number
is
in
the range of
1
to 20. With this setting, remote
I/O
modules
and remote terminal modules having
a
station number
larger than 20
is
not refreshed.
If the setting for the total number of stations
is
"0",
or
"65"
or greater, the setting
is
replaced with
a
default.
Setting of
a
number which
is
larger than the number of
stations actually connected to the
A2C,
a
communication
error occurs with the stations that are not actually con-
nected.
Mode
The mode setting
is
used for data communications between
the
A2C and
a
remote
I/O
module or remote terminal module.
The
set
mode becomes effective when the A2C
is
turned on,
it
is
reset, or its operation status changes from STOPPAUSE to
RUN.
Automatic online return provided
If
a
communication error occurs with any of the modules in
the link, data communication
is
executed only with mod-
ules operating correctly.
Data communication with the faulty station will restart
automatically when
it
recovers normal operating state.
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