Motorola DH6200 Spécifications télécharger pdf (Page 43)

2-31Master Glossary of Terms and Symbols

TR4.0:PROVOXRevision A — April 1997

deviation

Usually, the difference between setpoint

and process variable. More generally, a

departure from a desired or expected

value or pattern.

deviation alarm

An alarm that signals a specified amount

of difference exists between two

monitored values; usually the process

variable and the setpoint. In PROVOXr

systems, th e A alarm is the deviation

alarm.

device

A piece of electronic hardware that

performs one or more prescribed

functions.

device information

Information specific to a device, which is

then specific to a tag number (once a tag

number is assigned to the device).

Device information is usually composed

of the information found on a standard

data sheet. Device information is also

referred to as device specific information.

device-specific co mmands

HART protocol commands that provide

functions that are unique to a particular

smart field device. These commands

access information required for setup and

calibration, and information about the

construction of the device.

See Common-Practice Commands.

device specific in f o rmation

Information associated with the specific

instrument (e.g., manufacturer, model

number, and so on).

device status byte

The HART protocol specifies that each

smart field device will provide an 8-bit

byte indicating integrity of the smart field

device when it is requested by a host

device. The device status byte is returned

with every response message.

DEVSTAT

Acronym: Device Status

1. This remote detail display parameter

(DDP) a ttribute, 235:DEVSTAT, allows

the device status b yte to be displayed as

a bit pattern.

2. The DEVSTAT instruction in a function

sequence table (FST) step enables the

user to access the device status byte and

the alerts byte.

See Device Status Byte.

DH

Acronym: Data Historian

DH co n figuration parameter

Attributes of SDFs and HDFs, for

example, OLD RCRD, NEW RDRD and

OCC.

DI

Acronym: Discrete Input

diagnostics

One or more programs in a computer or

microprocessor that can detect and

pinpoint a configuration error or a

hardware fault. Also, the utility or

functionality such programs add to a

product.

DIAGS

Abbreviation: Diagnostics

dialog box

A window containing information or a

prompt for input. A Dialog Box may

provide an indication of the current state

of work in progress, ask a question, issue

a warning, or draw attention to an error.

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