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I
4. A2CCPU
- - - - - - - - - - - - - - - - - - - - MELSEC-A
(2)
Relationship between occupied number of points and station (lumbers
(a) I/O modules and remote terminal modules which have 8 or more I/O
points occupy station numbers to be assigned to several stations;
station numbers to be occupied are consecutive.
The station number occupied by one module cannot be set for other
modules.
For the number of stations to be occupied by an I/O module and
remote terminal module, see Section 2.3.1.
(b) Station numbers to be assigned to I/O modules and remote terminal
modules must be consecutive.
When a module which has more than 8 I/O points is used, the station
number of the next module must be assigned by skipping the
number of stations corresponding to the occupied stations.
Statlon
number: 14
Station number: 6
(occupies
statlons 6 to 9)
POINT
I
I
A2CCPU
I
I
I
B-point I/O
B-point I/O
module
module
1
stations
1
station
occupied
occupied
I
I
32-point I/O
32-point I/O
module
module
4
stations
4
stations
occupied
occupied
I
I
Remote terminal module
4 stations occupied
Station number. 10
(occupies stations 10 to 13)
Fig. 4.26 Example of Station Number Setting
Station
number: 1
Station number: 2
(occupies
stations
2
to
5)
(1) If the same station number is set for two or more stations, input or
output error might occur.
When setting station numbers, take the number of stations to be
occupied by each module so that the same station number will not be
used by more than one station.
(2) If station number is skipped, the skipped station number becomes a
faulty station, and M9061 is turned ON.
The ERR LED on the front of the A2C is turned ON.
4-75

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