Rockwell Automation 2711-ND3 PanelBuilder v2.60 Software User Manual - Manual (Page 61)

4–5 Communications Overview
Publication 2711-6.0
The PanelView terminal writes information (write tags) to the
processor only when a change of state occurs. The terminal reads
information (read tags) from the processor continually. The read and
write tags can use the same address.
Scan Group
A scan group consists of 40 consecutive words within the same data
file and processor. The group starts at the lowest address in the data
file. The scan group must have the same update frequency. For an
application with tag addresses: N7:0, N7:39, N7:40, N11:0, N12:5
and N12:40, the scan groups are:
•
N7:0 – N7:39
•
N7:40
•
N11:0
•
N12:5 – N12:40
Minimize the number scan groups per screen. Maintain the same
update frequency for each 40 word block.
DH-485/DH+/DF1
Communication
Considerations