Allen-Bradley ControlLogix System 1756-L1 User Manual page 421

input or output data?
input
analog or digital?
analog
RTS ≤ RPI?
Yes
Data is sent to the backplane
at the RTS.
• Over a ControlNet network, remote data is sent at the actual packet
interval.
• Over an EtherNet/IP network, remote data is sent close to the RPI,
on average.
Allen-Bradley HMIs
1
Determine When Data Is Updated
ControlLogix controllers update date asynchronous with the execution
of logic. Use the following flowchart to determine when a producer
(controller, input module, or bridge module) will send data.
output
digital
COS for any point on the
module?
No
Data is sent to the backplane at
the RTS and RPI.
Data is sent to the backplane at the RPI
and at the change of a specified point.
analog or digital?
analog
remote
No
Yes
Data is sent to the backplane at the
RPI
Data is sent to the backplane at the RPI
and at the end of every task.
Publication 1756-UM001E-EN-P - August 2002
D
Appendix
digital
remote or local?
local