Rockwell Automation 1747-ASB Remote I/O Adapter - Manual (Page 12)

Publication 1747-UM006B-EN-P - June 2003
4 Preface
does not receive communications from the scanner within a certain
period of time.
I/O Module - Any 1746 or 1747 I/O module that is supported by the
1747-ASB module.
Local Expansion Chassis - A chassis that is connected to a local SLC
chassis using a 1747-C9 (91.4 cm [36 in.]) or 1747-C7 (15.2 cm [6 in.])
cable.
Local PLC Chassis - The 1771 chassis that contains a PLC processor
and scanner.
Local SLC Chassis - The chassis that contains the SLC processor and
scanner.
Logical Device - Any portion of a logical rack that is assigned to a
single adapter. Adapters may appear as more than one logical device.
Logical Group - A logical group consists of one input and one output
word within a logical rack. A word consists of 16 bits, each bit
represents one terminal on a discrete I/O module.
Logical Rack - A fixed section of the scanner image comprised of
eight input words and eight output words.
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.
PLC Chassis - A physical PLC rack that houses 1771 I/O modules and
PLC processors.
Remote Chassis - The chassis containing a 1747-ASB module and
connected to the local SLC or PLC 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.