Rockwell Automation 1606-XLP XM Electronic Overspeed Detection System - Manual (Page 65)

Publication GMSI10-UM015B-EN-E - June 2011
Glossary 65
MAC ID
See node address.
master device
A device which controls one or more slave devices. The XM-440 Master Relay
module is a master device.
node address
A DeviceNet network can have as many as 64 devices connected to it. Each
device on the network must have a unique node address between 0 and 63.
Node address 63 is the default used by uncommissioned devices. Node
address is sometimes called “MAC ID.”
Normally Closed Contacts
A set of contacts on a relay or switch that are closed when the relay is
de-energized or the switch is de-activated. They are open when the relay is
energized or the switch is activated.
Normally Open Contacts
A set of contacts on a relay or switch that are open when the relay is
de-energized or the switch is de-activated. They are open when the relay is
energized or the switch is activated.
NVS (Non-Volatile Storage)
NVS is the permanent memory of an XM module. Modules store parameters
and other information in NVS so that they are not lost when the module loses
power (unless Auto Save is disabled). NVS is sometimes called “EEPROM.”
online help
Online help allows you to get help for your program on the computer screen
by pressing F1. The help that appears in the Help window is context sensitive,
which means that the help is related to what you are currently doing in the
program.
Polled
DeviceNet communications method in which the module sends data in
response to a poll request from a master device.