Allen-Bradley 1747-SN User Manual page 182

Glossary G–3
Reset, Adapter Reset Commands sent by the scanner to a logical
device during an RIO discrete transfer. These commands instruct the
logical device to reset all of its discrete outputs, regardless of the
hold last state selection.
RIO Block Transfer The exchange of up to 64 words of data
between the scanner and a remote device. RIO block transfers only
occur if you program them in your processor control program.
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 and one or more slaves.
RIO Link Device Refers to any Allen-Bradley or licensed third
party product that connects to the RIO link as an adapter or slave
device.
Scanner The Catalog Number 1747-SN, Remote I/O Scanner,
which is the master on the RIO network.
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
processor image.
SLC Chassis A physical SLC rack that houses SLC processors
and 1746 and 1747 I/O modules.
SLC Processor The processor that controls the SLC chassis in
which the the scanner is installed.
Slot The physical location in any SLC 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).
Publication 1747 6.6 - July 1996