Rockwell Automation 2706 DL40 HARDWARE USER MANUAL - Manual (Page 29)

Chapter 3
The Run Mode – Remote I/O
3 – 3
Trigger Messages Via the Keyboard Port Or the RS-485 Port
See Chapter 8 for more information.
Send Variables to be Included In Message
Your PLC can include variables with the message trigger. Up to the
equivalent of 6 full word variables can be sent if using Discrete I/O
(depending on rack size) or up to the equivalent of 10 full word variables can
be sent using a Block Transfer Write (independent of rack size). See Chapter
10 for more information.
Variable types include:
•
16 bit binary (1 variable per word)
•
8 bit ASCII (2 per word)
•
4 digit signed Binary Coded Decimal (BCD) (1 per word)
•
1 digit (4 bit) unsigned BCD (4 per word)
You can send variables via an RS-485 link or the DL40 Keyboard Port. See
Chapter 8 for more information.
Insert ASCII Input Data Into a Message
Use the DL40 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] . See Chapter 6 for more information.
•
Up to 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 up to 20
ASCII characters long.
•
While a message is running, enter the ASCII character or string of ASCII
characters followed by a
[
↵
] .
See Chapter 8 for more information.
Return ASCII Input Data to a PLC
Via Remote I/O
Up to 12 ASCII characters (depending on rack size) are returned via Discrete
I/O. Up to 20 ASCII characters are returned via Block Transfer Read.
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