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Rockwell Automation Allen-Bradley AADvance T9110 - Technical Features; Controller Internal Bus Structure

Rockwell Automation Allen-Bradley AADvance T9110
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44 Rockwell Automation Publication ICSTT-RM448M-EN-P - February 2021
Chapter 2 The AADvance Safety Controller
Technical Features Controller Internal Bus Structure
Internal communication between the processor modules and I/O modules is
supported by command and response busses that are routed across the
processor and I/O base units.
The processor modules acts like a communications master, sending
commands to its I/O modules and processing their returned responses. The
two command busses I/O Bus 1 and I/O Bus 2 take the commands from the
processor to the I/O modules on a multi-drop basis. An inter-processor link
(IPL) supplies the communication links between dual or triple processor
modules.
Each I/O module has a dedicated response line which returns to the processor.
The unique response line for each I/O module supplies an unambiguous
identification of the source of the I/O data and assists with fault containment.

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