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Rockwell Automation Publication ICSTT-RM448J-EN-P - April 2018
Chapter 2
The AADvance Safety Controller
Expansion Cable
This is used to add extra rows of I/O base units and modules.
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.
