1
Publication 1756-UM001E-EN-P - August 2002
Appendix
D
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.
input or output data?
input
output
COS for any point on the
module?
Data is sent to the backplane at the
RPI
remote or local?
analog
No
Yes
Data is sent to the backplane at the RPI
and at the end of every task.
Data is sent to the backplane at the RPI
and at the change of a specified point.
Data is sent to the backplane at
the RTS and RPI.
Data is sent to the backplane
at the RTS.
analog or digital?
analog
digital
local
remote
digital
•
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.
Yes
No
RTS
≤
RPI?
analog or digital?
Summary of Contents for controllogix 1756-L63
Page 1: ...ControlLogix System 1756 L1 L1Mx L55Mxx L63 User Manual Allen Bradley HMIs...
Page 4: ...Publication 1756 UM001E EN P August 2002 Summary of Changes 2 Notes...
Page 16: ...Publication 1756 UM001E EN P August 2002 Table of Contents x...
Page 268: ...Publication 1756 UM001E EN P August 2002 15 4 Monitor Connections Notes...
Page 276: ...Publication 1756 UM001E EN P August 2002 16 8 Communicate with a DeviceNet Device Notes...
Page 402: ...Publication 1756 UM001E EN P August 2002 24 22 Program Motion Control Notes...
Page 408: ...Publication 1756 UM001E EN P August 2002 25 6 Maintain the 1756 BA1 Battery Notes...
Page 418: ...Publication 1756 UM001E EN P August 2002 B 2 Estimate Execution Time...
Page 420: ...Publication 1756 UM001E EN P August 2002 C 2 Estimate Memory Use...
Page 422: ...Publication 1756 UM001E EN P August 2002 D 2 Determine When Data Is Updated Notes...
Page 424: ...Publication 1756 UM001E EN P August 2002 E 2 Reconfigure an I O module Notes...
Page 428: ...Publication 1756 UM001E EN P August 2002 4 Index...
Page 429: ...Publication 1756 UM001E EN P August 2002 Index 5 Allen Bradley HMIs...
Page 430: ...Publication 1756 UM001E EN P August 2002 6 Index...
Page 435: ...ControlLogix System User Manual Allen Bradley HMIs...