Rockwell Automation 1747-SN Remote I/O Scanner - Manual (Page 163)

Publication 1747-UM013B-EN-P - January 2005
Glossary 3
Logical Slot
A logical slot consists of one input and one output byte within a
logical group. A byte consists of 8 bits, each bit represents one
terminal on a discrete I/O module.
M files
The SLC M0 and M1 data files that reside in the scanner. M files
contain RIO network status (M1) and control (M0) information. The
contents of these files can be directly accessed by your application
program. Also, the M files are used to control and monitor RIO block
transfer operations.
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.