Rockwell Automation 2706 DL40 HARDWARE USER MANUAL - Manual (Page 30)

Chapter 3
The Run Mode – Remote I/O
3 – 4
is set that the data should be considered valid. See Chapter 10 for more
information.
Via RS-485 Port
Up to 20 ASCII characters (independent of rack size) are returned via the
RS-485 Port. See Chapter 8 for more information.
Return the Message Number of the Message Being Run to a PLC
This is automatically done in the Remote I/O scan. See Chapter 10 for more
information.
Send Real Time Clock Or Date Data to a PLC
•
Triggering Special Message 912 (or 12) will cause the DL40 to send
clock data to a PLC.
•
Triggering Special Message 913 (or 13) will cause the DL40 to send date
data to a PLC.
Information on Special Messages appears in Chapter 5. See Chapter 7 for
more information on formatting time and date data.
Put Messages on Historical Events Stack
Both triggered messages and variable data can be put on the 16 Kbyte
Historical Events Stack. The contents of the stack can be viewed on the
DL40 display or printed:
•
in chronological order
•
by number or occurrences
See Chapter 6 for more information.
Require Handshake Between DL40 and PLC
Handshaking provides an indication to the sender (either the DL40 or the
PLC) that Image Table Data was received. See Chapter 10 for more
information.
Override Slave Address Selected as a Message Attribute with an
Address Sent with the Message Trigger
Note: For this mode only, if your DL40 is configured as a 1
/
4
rack device,
you must specify the slave address as a Message Attribute.