6-3-(3)
Host Link Serial Interface
Section 6-3
Operational Flowcharts
Serial Interface with I/O
Set the commands in the read bits of the Programmable Controller. The Con-
troller will read the commands directly from the read bits.
Note
If a response is not received within 5 seconds, a timeout error will occur in the
Controller because the Programmable Controller may be disconnected or mal-
functioning. An error message will be displayed on the Controller’s screen and
the parallel interface’s ERR signal will be turned ON.
Controller
Check whether command has
been set in the Read Area.
Send the 0 Clear command.
Execute the command.
Write the processing results to
the Write Area.
The parallel interface's BUSY signal will be ON during measuring.
The Controller will not operate after
this point if the command format
is incorrect.
Command to output
processing results?
Yes
No
Programmable Controller
(Unit number: 00 (fixed))
Return the command.
The Read Area is cleared
to all 0s.
Return response indicating that
the write operation was completed
normally.
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