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Reference Manual

00809-0200-4801, Rev CA

July 2010

A-9

Rosemount 3051S

ANALOG INPUT (AI)

FUNCTION BLOCK

The Analog Input (AI) function block processes field device measurements

and makes them available to other function blocks. The output value from the

AI block is in engineering units and contains a status indicating the quality of

the measurement. The measuring device may have several measurements or

derived values available in different channels. Use the channel number to

define the variable that the AI block processes.

The AI block supports alarming, signal scaling, signal filtering, signal status

calculation, mode control, and simulation. In Automatic mode, the block’s

output parameter (OUT) reflects the process variable (PV) value and status.

In Manual mode, OUT may be set manually. The Manual mode is reflected on

the output status. A discrete output (OUT_D) is provided to indicate whether a

selected alarm condition is active. Alarm detection is based on the OUT value

and user specified alarm limits. Figure A-1 illustrates the internal components

of the AI function block, and Table A-3 lists the AI block parameters and their

units of measure, descriptions, and index numbers.

XD_

Scale

OUT_

Scale

Range Range

Manual

Auto

OOS

Standard

Deviation

Calculation

Alarm

Direction

OUT

OUT_D

ALM_SEL

ALARM_HYS

HI_HI LIM

HI_LIM

LO_LO LIM

LO_LIM

Status

Calc.

PV_FTIME

Direct

Indirect

Cutoff

Indirect

Filter

Channel

1 2 ... 114 115 116 117 118 119 120 121 122 123 124 ... 239 240

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