Sending variables – Rockwell Automation 2706 DL40 HARDWARE USER MANUAL User Manual
Page 102
Chapter 10
Using Remote I/O
10 – 10
The DL40 will continue to return Time/Date Data as a response to Special
Message 912 or 913:
•
for 100 milliseconds if Hardware handshaking is not set
or
•
until the DL40 receives acknowledgement that the PLC has received the
data if Hardware handshaking is set.
Whenever Clock/Date Data is being returned to the PLC, the Clock/Date
Data Bit in the Input Image Table will be set.
When variables are sent, all
[CTRL][V]
(formatted) variables must be sent
first followed by
[CTRL][W]
(unformatted) variables.
NOTE: In the text of this manual, the up caret,
^
,
may be used in place of the
[CTRL]
key where space requires. For example,
^
W
means the same as
[CTRL][W]
.
Example:
If a message has variables positioned as follows:
[CTRL][V]
[CTRL][W]
[CTRL][V]
[CTRL][W]
[CTRL][V]
First
Position
Second
Position
Third
Position
Fourth
Position
Fifth
Position
and
[CTRL][W]
variables are ASCII, they would be sent in the following
order:
^V
1st position
^V
3rd position
^V
5th position
^W 2nd position
^W
4th position
MSB
LSB
WORD n
WORD n +1
WORD n +2
WORD n +3
If
[CTRL][W]
variables are BCD variables, word n+3 would look like:
UNUSED
MSB
LSB
WORD n +3
^W
4th position
^W
2nd position
Sending Variables