Rockwell Automation 2706 DL40 HARDWARE USER MANUAL - Manual (Page 89)

Chapter 9
Using the Parallel Port
9 – 5
with the AC Output Module. The ISO +12V connection can be used to
power the DC connections of the 2706–NG2 AC input converters.
Triggering rules:
•
When used, optional slave address must always precede the message
number.
•
Up to 10 variables are addressable within a message.
•
Variables must always follow the message number.
•
Variables sent are always associated with the last message triggered:
– if the message is in the queue, variables will be put into the queue
(with the message) and onto the Historical Events Stack.
– if message is running and variable is being displayed, the variable will
be updated with the latest data this data will also be put onto the
Historical Events Stack.
– if message is running and variable is no longer being shown (as in a
scrolling message), updated data will not be shown but will be put on
Historical Events Stack.
– if message has completed running, updated data is lost to display and
to the Historical Events Stack.
•
BCD Sign Bit
Only valid for [CTRL][V] BCD variables; not valid for [CTRL][W] BCD.
– Set = –
– Clear = +
– Sign bits must precede variables. The sign cannot be changed without
resending the variable.
– Bit 0 = Variable l
– Bit 1 = Variable 2, etc.
– Bits 9 = 15 ignored
– No Sign Bit sent (default) = +
Message/Variable/Slave
Run Mode
Note: For BCD variables only. Ignored for binary and ASCII
variables. To sign a binary variable, use 2’s complement.