Rockwell Automation 2706-LV2P_LV2R_LV4P_LV4R DL40 PLUS USER MANUAL - Manual (Page 96)

Remote I/O Communications 8–4
Publication 2706-6.1
The following terms are used in this chapter:
Acknowledge Bit
Set by the DL40 Plus whenever the MSG ACK Push Button (on the
front panel) is pressed after the message has run and the
Acknowledge Attribute for the message is set. 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 entered using the 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 for [CTRL][W] BCD.
Bit Set = -
Bit Clear = +
Note: For BCD variables only. This bit is ignored for binary
and ASCII variables. For negative binary variables, use a 2’s
complement.
Clock/Date Data Bit
Set by the DL40 Plus to indicate that 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 is not set for a 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 not full
Bit 11 Clear = Message buffer (queue) is full
Bit 12 = Reserved
Bit 13 Set = Display not operating properly
Bit 13 Clear = Display operating properly
Enter Bit
Set after all ASCII input data a message requires has been entered
into a message. It is only after this bit is set that ASCII input data
should be considered valid.
Remote I/O Terminology