I
•
4.A2CCPU
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MELSEC·A
(5) Total number of stations
(a) The total number of stations is set to determine the range
for
I/O
refresh.
Set the last station number of remote I/O modules or remote ter-
minal modules connected to the A2C.
If
the
last station (remote I/O 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'.
(b) I/O 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
1/0 modules and remote terminal modules having a
station
number
larger than 20 is not refreshed.
(c) If
the
setting
forthe
total number of stations is
"0',
or
"65'
or greater,
the
setting is replaced with a default.
(d) 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 connected.
(6) Mode
The mode setting is used for data communications between
the
A2C
and a remote
1/0 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 STOP/PAUSE to RUN.
(a) Automatic online return provided
In this mode, data communication is executed between the A2C and
a remote I/O module and remote terminal module.
If a communication error occurs with any of the modules in the link,
data communication is executed only with modules operating cor-
rectly.
Data communication with the faulty station will restart automatically
when it recovers normal operating state.
4-39
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