1 computer link function, 3 computer link mode – Toshiba SX 2000 User Manual
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1.3.1
Computer link function
Chapt.1 System Configuration
1.3 Computer link mode
In the computer link system, the S2T waits for receiving a request message issued
from the master computer.
When a request message is issued, the S2T checks the station number contained in
the request message. And when the station number designation matches the S2T’s
station number setting, the S2T processes the request and returns the response.
This is why each S2T must have a unique station number in the one-to-N
configuration. Otherwise, more than S2T’s may attempt to process the request,
resulting in faulty response.
The following figure illustrates the processing sequence when a request to station
number 3 is issued.
#1
#2
#3
#4
#5
#6
#7
#32
® The request message is sent from the master to all the connected S2T’s.
(request for station #3 in this example)
® The request message is interpreted and processed in the S2T which has the
same station number as request.
(station #3 S2T in this example)
® Processing result is returned as response to the master.
NOTE
Available station number is 1 to 32. The station number is set in the S2T’s system information
memory.
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Sequence Controller S2T