Mitsubishi Electric MELSEC-A Series User Manual page 75

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4.A2CCPU
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(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.
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