Allen-Bradley 22-COMM-E FRN 1.xxx User Manual page 157

Glossary G-7
RSLogix
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 http://www.software.rockwell.com/rslogix.
RSNetWorx for EtherNet/IP
RSNetWorx for EtherNet/IP software is a tool for configuring and
monitoring EtherNet/IP networks and connected devices. It is a 32-bit
Windows application that runs on Windows 95, Windows 98, and
Windows NT. Information about RSNetWorx for EtherNet/IP software
can be found at http://www.software.rockwell.com/rsnetworx.
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.
Status Indicators
Status indicators are 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
A subnet mask is 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 Class C address 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
Switches are 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.