Glossary

M

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

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

module

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

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

model

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.

MOV

metal oxide varistor. A two-electrode semiconductor device with a voltage-

 

dependant nonlinear resistance that drops markedly as the applied voltage is

 

increased. It is used to suppress transient voltage surges.

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.

 

 

N

N.C. contact

normally closed contact. A relay contact pair that is closed when the relay coil is de-

 

energized and open when the coil is energized.

N.O. contact

normally open. contact. A relay contact pair that is open when the relay coil is de-

 

energized and closed when the coil is energized.

NEMA

National Electrical Manufacturers Association.

network cycle

The time that a master requires to complete a single scan of all of the configured I/

time

O modules on a network device; typically expressed in microseconds.

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Schneider Electric 890USE17700 manual Contact, Energized and open when the coil is energized, Nema, Network cycle
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890USE17700 specifications

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