Rosemount 848T Uživatelský manuál stáhnout pdf (Strana 9)

Quick Installation Guide

00825-0100-4697, Rev DB

September 2011

Rosemount 848T

STEP 4 CONTINUED...

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.

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.

Table 2. AI Block Parameters

(1)

(1) Configure one AI Block for each desired measurement.

Parameter Comments

CHANNEL Choices:

1. Sensor 1 – 8

2. Differential Sensors 1 – 4

3. 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

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”

Table 3. MAI Block Parameters

Parameter Comments

CHANNEL Choices:

1. Channels 1 – 8

2. 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

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

•mA

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 19 20

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