Siemens Pacemaker UM344-2 Uživatelský manuál stáhnout pdf (Strana 156)

UM344-2 GLOSSARY

September 1995

NETWORK RESISTANCE - Defined as the sum of the Current Sense Resistance, Barrier Resistance,

if any, and any other resistance in the Network.

NPT - National Pipe Thread

OPTN = OPTION - MXC screen abbreviation

OTHR = OTHER - MXC screen abbreviation

OVRD = OVERRIDE - MXC screen abbreviation

POINT-TO-POINT NETWORK - A Network having a single field instrument and Primary Master.

Analog signaling or analog plus digital signaling is possible.

PREV = PREVIOUS - MXC screen abbreviation.

PRIMARY MASTER - The single controlling Network Element that communicates with one or more

field instruments.

RERANGING - Changing the transmitter's 4 and 20 mA settings (i.e., setting LRV and URV); this is a

configuration function.

RTD - Resistance temperature detector - A temperature transducer based on the principle that the

resistivity of a metal shows a marked temperature dependence.

SECONDARY MASTER - An occasional user of the Network such as the XTC Communicator

(MXC).

SEL = SELECT - MXC screen abbreviation.

SNSR INPT = SENSOR INPUT - MXC screen abbreviation

SPAN - Algebraic difference between the upper and lower range values (URV and LRV).

TEMPERATURE TRANSMITTER (TWO-WIRE) - A device which is used to transmit temperature

data from either a thermocouple or RTD via a two-wire current loop. The loop provides power to the

transmitter which acts as a variable resistor with respect to its input signal.

THERMOWELL - A closed-end tube designed to protect temperature sensors from severe

environments , high pressure, and flows. Usually made of corrosion-resistant metal or ceramic material.

TRANSDUCER - A device that accepts an input, such as pressure, and converts that input into an output

of some other form, such as a voltage.

TRANSMITTER SHORT ADDRESS - A unique number assigned during configuration that identifies

a transmitter connected to a network. An address between 1 and 15 is assigned to a transmitter

connected to a Multi-Drop network. A transmitter connected to a point-to-point network has 0 as an

address.

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Siemens Pacemaker UM344-2 Uživatelský manuál Strana 156