Rockwell Automation 20-COMM-R Remote I/O Adapter User Manual
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Glossary
20-COMM-R Remote I/O Adapter User Manual
Publication 20COMM-UM004D-EN-P
Remote I/O Network
Remote I/O is an Allen-Bradley network interface originally designed to
link remote I/O racks to PLCs over appropriate cables (‘Blue-Hose’).
Remote I/O supports remote, time-critical control communications between
a client controller and server devices such as a Remote I/O adapter and its
connected host drive. A server device will accept only the packets that are
addressed to it. Remote I/O also supports Block Transfer messaging.
Remote I/O networks (sometimes called links) can support up to 32 devices
on a channel.
S
Scanner
A scanner is a separate module (of a multi-module controller) or a built-in
component (of a single-module controller) that provides communication
with adapters connected to a network. See also Controller.
Starting Module Group
The starting module group is the word in a rack at which the group starts. It
depends on the rack size. This Remote I/O adapter can be configured as a
1/4 rack, which is two words, or a 1/2 rack, which is 4 words. Adapters
configured as 1/4 racks can use starting module groups 0, 2, 4, or 6.
Adapters configured as 1/2 racks can use only starting module groups 0, 2,
or 4.
Status Indicators
LEDs that are used to report the status of the adapter, network, and drive.
They are on the adapter and can be viewed on the front cover of the drive
when the drive is powered.
U
Update
The process of updating firmware in a device. The adapter and its connected
PowerFlex 7-Class host drive and its peripherals can be updated using
various Allen-Bradley software tools. See
Z
Zero Data
When communication is disrupted (for example, a cable is disconnected),
the adapter and drive can respond with zero data. Zero data results in the
drive receiving zero as values for Logic Command, Reference, and Datalink
data. If the drive was running and using the Reference from the adapter, it
will stay running but at zero Reference.