4-2
Section
Communication Settings
45
Using TXD Instructions
Commands are sent from the Programmable Controller to the
V530-R150 using TXD instructions in the Programmable Con-
troller’s ladder program instead of the Read Area. If TXD instruc-
tions are to be used to send commands, set the Read Area to
“None.”
Unit No.: 00 (fixed)
TXD instruction executed in ladder program.
Executes command.
Returns write completed
response.
A timeout error occurs if there is no response within 5 s.
An error message appears on the screen and the ERR (error)
terminal turns ON.
Set ’3 bytes’ for the
number bytes of send
data.
Terminal block BUSY terminal turned ON during readings.
Writes data to Write Area.
End
V530
PLC
Program example
→