Network Card User Manual

Glossary

178

890USE17700 April 2004

function block A function block performs a specific automation function, such as speed control. A

function block comprises configuration data and a set of operating parameters.

function code A function code is an instruction set commanding one or more slave devices at a

specified address(es) to perform a type of action, e.g., read a set of data registers

and respond with the content.

gateway A program or /hardware that passes data between networks.

global_ID global_identifier. A 16-bit integer that uniquely identifies a device’s location on a

network. A global_ID is a symbolic address that is universally recognized by all other

devices on the network.

GSD generic slave data (file). A device description file, supplied by the device’s

manufacturer, that defines a device’s functionality on a Profibus DP network.

HMI human-machine interface An operator interface, usually graphical, for industrial

equipment.

HMI human-machine interface An operator interface, usually graphical, for industrial

equipment.

hot swapping Replacing a component with a like component while the system remains

operational. When the replacement component is installed, it begins to function

automatically.

HTTP hypertext transfer protocol. The protocol that a web server and a client browser use

to communicate with one another.