User manual

Glossary

33002479 06 07/2008 375

firewall A gateway that controls access to a network or an application.

frame A group of bits that form a discrete block of information. Frames contain network

control information or data. The size and composition of a frame is determined by

the network technology being used.

framing types Two common framing types are Ethernet II and IEEE 802.3.

FTP File Transfer Protocol. The protocol (over TCP) used to read or write a file into a

remote station (the FTP server side).

gateway A device that connects networks with dissimilar network architectures and that

operates at the Application Layer. This term may refer to a router.

Global Data

(Publish /

Subscribe)

Service of inter PLC synchronization (shared databases).

half duplex (HDX) A method of data transmission capable of communication in two directions,

but only one direction at a time.

host A node on a network.

hostname A domain name given to a specific computer on a network and used to address that

computer.

HTTP A domain name given to a specific computer on a network and used to address that

computer.

hub A device that connects a series of flexible and centralized modules to create a

network.