Allen-Bradley 1747-SN User Manual page 14

1–2 Overview
SLC 5/02 RIO
or Later Scanner
Processor
Adapter 1
Half Logical Quarter Logical
Rack Rack
Device Device
Publication 1747 6.6 - July 1996
The scanner can be configured for and transfer a maximum of 4
logical racks of discrete data on the RIO link. The scanner provides
discrete I/O and block (Series B or later) transfers. Configurations
allowed are any combination of quarter, half, three quarter, or full
logical rack devices.
The scanner transfers discrete input and output data
between itself, remote adapters, and the SLC processor.
Remote adapters consist of 1746 chassis and other
Allen Bradley operator interface and control devices.
Adapter 2
Adapter 3
Half
Logical Rack
Device
The SLC processor transfers the scanner's 4 logical racks (32 input
image and 32 output image words) of discrete remote I/O image data
into the SLC input and output image files. You can adjust the size of
the scanner input and output image file during configuration of your
SLC system so that the scanner only transfers the discrete I/O data
your application program requires. Configuration is done through
the confiGuration file (G file). Refer to chapter 4, Configuration and
Programming for more information.
Important:
backplane power requirements (power supply dependent)
SLC 500 processor I/O data table limit (4,096 I/O)
processor memory to support the application (SLC 500 processor
dependent)
Adapter 4
Adapter 5
Three Quarter Full
Logical Rack Logical Rack
Device Device
The SLC 500 processor (SLC 5/02 or later) supports
multiple scanners in its local I/O chassis. The
maximum number is dependent on the following:
Adapter 6
Full
Logical Rack
Device