1747-6.22, Backup Scanner User Manual

Glossary 213
Module Status Word (MSW) − This word is M1:s.3401 (where
s=slot number of the BSN) and is used to monitor the status of the
1747-BSN itself and its counterpart in the remote system.
Output file − The scanner’s output file that is updated during the
SLC processor output scan.
Remote Chassis − The chassis containing an ASB module and
connected to the local SLC chassis via the RIO link.
Remote Expansion Chassis − A chassis that is connected to a remote
chassis using a 1747-C9 (91.4 cm [36 in.]) or 1747–C7
(15.2 cm [6 in.]) cable.
Reset, Adapter Decide − 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 if hold last state is not
selected, or to hold all of its discrete outputs in their last state if hold
last state is selected.
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.
Publication 1747-6.22