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6. INSTALLATION AND PRE-OPERATION SElTlNG PROCEDURES
MELSEC-A
6.4
Station Setting
By setting the station number of an
A64RDC,
the addresses of the batch
refresh communications areas (where control
1/0
signal information is stored)
and the range
of use of the remote terminal communications data areas
(where command data and read/write data are stored) are designated. Take
the following points into consideration when performing station setting.
-
PRECAUTION]
Do
not change the station setting during communications in the
MINI43
link. If it is changed, an I/O error may occur.
(1)
The range of station setting is 1 to
(64
-
[number of occupied stations of
this module]
+
1 ) .
(2) The range
of communications with remote
I/O modules and remote
terminal modules is determined by the total number of remote stations
(initial data ROM).
For example, if the total number of remote stations is
10,
communica-
tions is executed with the remote
I/O modules and remote terminal
modules whose station numbers are between
1
and
10.
(3)
Station numbers can be set without regard
to the order in which the
modules are connected.
Remote terminal
Master station
Remote
1 1 0
module
Remote
I/O
module
module
A64RDC
Remote I/O module
AJ71 PT32-S3
(4 occupied stations)
(4
occupied stations)
(4 occupied stations)
(4 occupied stations)
9 to 12
1
to
4
13
to
16
Station 5
Station
9
Station 13 Station
1
f
f
(4) When setting station numbers, make sure there are no unused stations
(i.e., station numbers which do
not correspond to a remote terminal
module or remote I/O module) within the total number
of remote stations.
If there is an unused station within the total number of remote stations
(set with the initial data
ROM), that station will be identified
as a
communications error station.
6 - 7
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