Rockwell Automation 2706-LV2P_LV2R_LV4P_LV4R DL40 PLUS USER MANUAL - Manual (Page 110)

Remote I/O Communications 8–18
Publication 2706-6.1
Inserting ASCII Input Data in a Message
Use the Keyboard Port to input ASCII data intended for display.
•
A request for ASCII Input data can be placed in a message by
inserting a
[CTRL][X] .
•
A maximum of l20 ASCII characters can be requested for each
message triggered using Discrete I/O or Block Transfer Write.
•
Requests for ASCII data can be strung together to form inputs
with a maximum of 20 ASCII characters.
•
While a message is running, enter the ASCII character or string
of ASCII characters followed by a
[
↵
] .
See Chapter 6, Serial Port Communications, for more information.
Returning ASCII Input Data to a PLC
A maximum of 12 ASCII characters (depending on rack size) are
returned via Discrete I/O. A maximum of 20 ASCII characters are
returned via Block Transfer Read. See pages 8-21 and 8-24.
When all required ASCII data has been entered, the message will
time out and the Enter Bit in the Input Image Table will be set. It is
only after this bit is set that the data is considered valid.
Returning the Displayed Message Number to a PLC
This is automatically done in the Remote I/O scan. See pages 8-21
and 8–24.
Sending Real Time Clock or Date Data to a PLC
•
Triggering special message 912 (or 12) causes the DL40 Plus to
send clock data to a PLC.
•
Triggering special message 913 (or 13) causes the DL40 Plus to
send date data to a PLC.
For details, see pages 8–22 and 8-24. See chapter 3, Special
Messages, for more details on special messages.