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4 FUNCTIONS
MELSEC-QnA
4.6 Reserved Station Function
This is a function to treat the remote and local stations that are not actually connected
(but planned for connection in the future) not as "data-link faulty stations".
POINT
If already connected remote and local stations are set as reserved station, the specified
remote and local stations cannot perform data link at all.
(1) Setting method
The reserved station specification is performed with parameters (buffer memory
address 10
H to 13H).
Turn on the bit corresponding to the station number of the station to be reserved.
However, for remote/local stations that occupy more than 2 stations, turn on the
only bit corresponding to the station number set in the module's station number
setting switch.
The buffer memory configuration is shown below. (1 to 64 indicates station
numbers.)
Address b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
10
H 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
11H 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
12H 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
13H 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
(2) Setting example
(a) System configuration example
When one local station and one remote station are to be connected in the
future to the system with three remote stations:
Master
station
Station No. 1
Remote station
(occupies 2 stations)
Station No. 3
Remote station
(occupies 1 station)
Local station
(occupies 4
stations)
Station No. 8
Remote station
(occupies 1 station)
Station No. 9
Station No. 4
Modules to be connected in the future
Remote station
(occupies 1 station)
(b) Buffer memory setting example
Turn on the 3rd bit, corresponding to station No. 4, and 8th bit,
corresponding to station No. 9. (Set "264" for address 10
H.)
Address b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
10
H 0 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0
11H 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
12H 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
13H 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0