Rosemount 848T Manual do Utilizador descarregar pdf (Página 12)

January 2015

Quick Start Guide

Multiple analog input (MAI) function block

The MAI block processes up to eight field device measurements and makes the

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

engineering units and contains a status indicating the quality of the

measurements. Use the channel number to define the variables that the MAI

block processes. At a minimum, verify the parameters of the MAI block in Table 3.

Note

To make changes to the MAI 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.

Input Selector (ISEL) function block

The ISEL block processes up to eight field device measurements and makes the

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

engineering units and contains a status indicating the quality of the

measurements. Use the select type to define the selection method the ISEL block

processes. At a minimum, verify the parameters of the ISEL block in Ta bl e 4.

Note

To make changes to the MAI 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 3. MAI Block Parameters

Parameter Comments

CHANNEL

Choices:

Channels 1 – 8

Custom Settings (see Rosemount 848T Reference Manual for more information).

L_TYPE For most measurements, set to “DIRECT”

XD_SCALE

Set 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

Table 4. ISEL Block Parameters

Parameter Comments

IN_(1, 2, 3, 4, 5, 6, 7, 8) A connection input from another block

SELECT_TYPE

Specifies input selection method. Methods available include: First

Good, Minimum, Maximum, Middle, Average, or Hot Backup

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