Publication 1747-UM006B-EN-P - June 2003
Preface 5
RIO Block Transfer - The exchange of up to 64 words of data
between the scanner and adapter. RIO block transfers only occur if
you program them in your processor control program. The 1747-ASB
module supports a block transfer of up to 8 words.
RIO Discrete Transfer - The exchange of image data between the
scanner and adapter. RIO discrete transfers occur continuously
whenever the scanner and adapter are communicating on the RIO
link.
RIO Link - An Allen-Bradley communication system supporting
high-speed serial transfer of Remote I/O (RIO) control information.
This link consists of one master one or more slaves.
Scanner - The communication master on the RIO link.
Scanner Image - The data table area within the scanner, used to
exchange I/O information between the scanner and all the adapters
on the RIO link. The scanner image is a portion of the SLC or PLC
processor image.
SLC Chassis - A physical SLC rack that houses SLC processors, 1746
and 1747 I/O modules.
Slot - The physical location in any chassis used to insert I/O modules.
Specialty I/O Module - An I/O module other than a discrete I/O
module (e.g., an analog module).
The following conventions are used throughout this manual:
Common Techniques Used
in this Manual
• Bulleted lists such as this one provide information, not
procedural steps.
• Numbered lists provide sequential steps or hierarchical
information.
• Italic type is used for emphasis.
• Text in this font indicates words or phrases you should type.
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