Rockwell Automation 20-COMM-ER 20-COMM-ER Dual-Port EtherNet/IP Communication Adapter User Manual User Manual
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Rockwell Automation Publication 20COMM-UM015B-EN-P - July 2013
Glossary
network. The size of the word (either a 16-bit word or 32-bit word) is
determined by the drive.
Feedback is used to monitor the speed of the drive. It consists of one word of
input from the adapter to the network. The size of the word (either a 16-bit word
or 32-bit word) is determined by the drive.
RSLogix 5/500/5000 Software
RSLogix software is a tool for configuring and monitoring controllers to
communicate with connected devices. It is a 32-bit application that runs on
various Windows operating systems. Information about RSLogix software can be
found at
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.
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.
Subnet Mask
An extension to the IP addressing scheme that lets you use a single network ID
for multiple physical networks. A bit mask identifies the part of the address that
specifies the network and the part of the address that specifies the unique node
on the network. A ‘1’ in the subnet mask indicates the bit is used to specify the
network. A ‘0’ in the subnet mask indicates that the bit is used to specify the
node.
For example, a subnet mask on a network may appear as follows: 11111111
11111111 11111111 11000000 (255.255.255.192). This mask indicates that 26
bits are used to identify the network and 6 bits are used to identify devices on
each network. Instead of a single physical Class C network with 254 devices, this
subnet mask divides it into four networks with up to 62 devices each.
Switches
Network devices that provide virtual connections that help to control collisions
and reduce traffic on the network. They are able to reduce network congestion by
transmitting packets to an individual port only if they are destined for the
connected device. In a control application, in which real time data access is
critical, network switches may be required in place of hubs.