Installation guide

Glossary

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890USE17100 September 2003

LAN local area network. A short-distance data communications network.

light industrial

I/O

An Advantys STB I/O module designed at a low cost for less rigorous (e.g.,

intermittent, low-duty-cycle) operating environments. Modules of this type operate in

lower temperature ranges with lower qualification and agency requirements and

limited on-board protection; they usually have limited or no user-configuration

options.

linearity A measure of how closely a characteristic follows a straight-line function.

LSB least significant bit, least significant byte. The part of a number, address, or field that

is written as the rightmost single value in conventional hexadecimal or binary

notation.

MAC address media access control address. A 48-bit number, unique on a network, that is

programmed into each network card or device when it is manufactured.

mandatory

module

When an Advantys STB I/O module is configured to be mandatory, it must be

present and healthy in the island configuration for the island to be operational. If a

mandatory module fails or is removed from its location on the island bus, the island

will go into a pre-operational state. By default, all I/O modules are not mandatory.

You must use the Advantys configuration software to set this parameter.

master/slave

model

The direction of control in a network that implements the master/slave model is

always from the master to the slave devices.

Modbus Modbus is an application layer messaging protocol. Modbus provides client and

server communications between devices connected on different types of buses or

networks. Modbus offers many services specified by function codes.

MSB most significant bit, most significant byte. The part of a number, address, or field that

is written as the leftmost single value in conventional hexadecimal or binary notation.