Computer Link Operation - Toshiba V Series User Manual

Chapter 1 System Configuration
1.4.7

Computer link operation

1
S2
#1
30
In the computer link, S2 always waits for a request from the host computer. When the
host computer sends a command, each S2 checks that the station number contained in
the command coincides with the station number of its own.
The S2 having the coincided station number processes the request and sends a
response back to the host computer.
Other S2's having different station numbers ignore the command.
A flow of processing of the request to station No. 3 is shown below.
(2)
S2 S2
#2 #3
(1) The host computer sends a request to an S2 (Station No. 3).
(2) The S2 of the specified station number processes the request (only station No. 3).
(3) The S2 sends the result to the host computer (response from station No. 3).
Host
computer
(3)
(1)
S2 S2 S2
#4 #5 #6
model 2000 Sequence Controller S2 User's Manual -Basic Hardware-
Request (Host S2)
Response(Host S2)
S2 S2
#7 #32