Allen-Bradley controllogix 1756-L55M12 User Manual

Publication 1756-UM001G-EN-P - January 2007
Place, Configure, and Monitor I/O Modules 63
Determine When Data Is
Updated
ControlLogix controllers update date asynchronously with the
execution of logic. Use this flowchart to determine when a producer,
such as a controller, input module, or bridge module, will send data.
Overview - Updating 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 usually sent close to
the RPI.
Yes
No
RTS ≤ RPI?
Analog or Digital?

Allen-Bradley controllogix 1756-L55M12 Specifications

General

Brand	Allen-Bradley
Model	controllogix 1756-L55M12
Category	Controller
Language	English