Rockwell Automation 2706 DL40 HARDWARE USER MANUAL - Manual (Page 103)

Chapter 10
Using Remote I/O
10 – 11
The following definitions apply universally for all I/O tables in this chapter:
•
Acknowledge Bit
This bit is set by the DL40 whenever the MSG ACK Push Button (on the
front panel) is pressed after the message has completed running and the
Acknowledge Attribute for the message is set. It indicates that an operator
has physically acknowledged a message triggered by the PLC.
•
Add/Delete Bit (only for Message List Run Mode)
Bit set = adds Message Number (in word 1) to Message List.
Bit Clear = deletes Message Number (in word 1) from Message List.
•
ASCII Character
One byte characters you input via the DL40 Keyboard Port. These are
only valid for messages that have ASCII Input Data
[CTRL][X] callouts.
•
BCD Sign Bit
Only valid for [CTRL][V] BCD variables; not valid for [CTRL][W] BCD.
Bit Set = –
Bit Clear = +
Note: For BCD variables only. This bit is ignored for binary and ASCII
variables. To sign a binary variable, use 2’s complement.
•
Clock/Date Data Bit
This bit is set by the DL40 to indicate that either clock data
(hour–minute–second) or date data (month–day–year) is being returned to
the PLC. You request clock or date data by triggering Special Message
912 (or 12) or 913 (or 13), or by setting the
Always Send Clock file
attribute. This bit will never be set for returning Message Number to a
PLC.
•
Diagnostic Code
Bit 10 Set = Display is not in the Run Mode
Bit 10 Clear = Display is in the Run Mode
Bit 11 Set = Message buffer (queue) is full
Bit 11 Clear = Message buffer (queue) is not full
Bit 12 = Reserved
Bit 31 Set = Display not operating properly
Bit 31 Clear = Display operating properly
•
Enter Bit
Bit set after all ASCII Input Data a message requires has been input into a
message. It is only after this bit is set that ASCII Input Data should be
considered valid.
Definitions