Rockwell Automation 1747-L5xx SLC 500 Modular Hardware Style User Manual - Manual (Page 279)

Publication 1747-UM011G-EN-P - June 2008
Glossary 279
multi-master network
A network in which more than one node has the ability to initiate
communication and initialize the link.
M0/M1 file transfer
A M1/M0 file transfer is a method of moving large amounts of data
between a SLC 500 processor and its scanner. It transfers files
containing a maximum of 256 words and may take more than one SLC
program scan to complete.
negative logic
The use of binary logic in such a way that 0 represents the desired
voltage level.
network
A series of stations (nodes) connected by some type of
communication medium. A network may be made up of a single link
or multiple links.
node
Also called a station. An address or software location on the network.
nominal input current
The current at nominal input voltage.
normally closed
Contacts on a relay or switch that are closed when the relay is
de-energized or deactivated. They are open when the relay is
energized or the switch is activated.
normally open
Contacts on a relay or switch that are open when the relay is
de-energized or the switch is deactivated. They are closed when the
relay is energized or the switch is activated.
off-delay time
The OFF delay time is a measure of the time required for the
controller logic to recognize that a signal has been removed from the
input terminal of the controller. The time is determined by circuit
component delays and by any applied filter.