Omron V530-R2000 User Manual page 95

SECTION 7
Host Communications
§ Using TXD Instructions
When using the TXD instruction, commands are not set in the Read Area, but are
actively sent from the PLC to the Controller.
Set System Set./Com Mode/Read Area to None.
Executes the command.
Writes data to Write Area.
V530-R2000
78
User's Manual
V530-R2000
Controller
While the command is being executed, the BUSY output terminal
is ON.
END
Write Area
PLC
Unit number: 00 (fixed)
Send command using a TXD instruction.
Set the number bytes of
send data to 3 bytes.
Returns write completed
response.
A Host Link error occurs and the ERROR output
terminal turns ON if there is no response within 5
seconds. It is assumed that the line is broken or
the PLC is not working correctly.
An error message is displayed on the screen.