Rosemount 848T Manual do Utilizador descarregar pdf (Página 11)

Quick Start Guide

January 2015

Analog input (AI) function blocks

The AI block processes field device measurements and makes the outputs

available to other function blocks. The output value of the AI block is in

engineering units and contains a status indicating the quality of the

measurements. Use the channel number to define the variable that the AI block

processes. At a minimum, verify the parameters of the AI blocks in Ta bl e 2.

Note

To make changes to the AI block, the BLOCK_MODE (TARGET) must be set to OOS (out of service).

Once the changes are made, return the BLOCK_MODE TARGET to AUTO.

Table 2. AI Block Parameters

(1)

1. Configure one AI Block for each desired measurement.

Parameter Comments

CHANNEL

Choices:

Sensor 1 – 8

Differential Sensors 1 – 4

Body Temperature

L_TYPE For most measurements, set to “DIRECT”

XD_SCALE

Set the desired measurement range and units. Units must be one of the

following:

 mV

 Ohms

 °C

 °F

 °R

 K

 mA

OUT_SCALE For “DIRECT” L_TYPE, set OUT_SCALE to match XD_SCALE

HI_HI_LIM

LO_LO_LIM

HI_LIM

LO_LIM

Process alarms.

Must be within the range defined by “OUT_SCALE”

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Rosemount 848T Manual do Utilizador Página 11