GE XMT868 User manual

913-326A

November 2005

Sensing

Network Connection and

Factory Reset

Fieldbus network connections are made at J8, pins 1 and 2 (see Figure 1

below). Optionally, a shield can be connected to J8 pin 3, depending on

the network wiring.

No connections are made to J9 under normal operation. If it is desired to

reset the network board to factory defaults:

1. Connect a jumper between J9 pin 2 and J9 pin 3.

2. Power cycle the instrument.

3. Ten seconds after the power has been restored to the unit, remove the

jumper to return the network board to normal operation.

Figure 1: Model XMT868 Rear View - Network Connection and Factory Reset

Foundation Fieldbus Communications for the XMT868

123

FieldbusNet(+)

FieldbusNet(–)

OptionalShield

•••

123

•

RTN

FactoryReset

N/C

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November 2005

Foundation Fieldbus

Communications

Foundation Fieldbus provides a means of communicating with the XMT

flowmeter. The patent numbers which apply are 5,909,363 and 6,424,872.

This Foundation Fieldbus device supports 2 Analog Input (AI) blocks,

which can be configured to supply the following measurements on the

network.

Table 1: Available Measurements

Description Units Description Units Description Units

Ch1 Velocity ft/s or m/s* Ch2 Totalizer Time seconds Ch1 Power POWER_U

Ch1 Volumetric VOL_U Ch2 Error Value none Ch1 +Energy ENERGY_U

Ch1 +Totals TOT_U Ch2 SSUP none Ch1 –Energy ENERGY_U

Ch1 -Totals TOT_U Ch2 SSDN none Ch1 TempS Deg F or C*

Ch1 Tot Digits** none Ch2 SNDSP ft/s or m/s* Ch1 TempR Deg F or C*

Ch1 Totalizer Time seconds Avg Velocity ft/s or m/s* Ch1 TS-TR Deg F or C*

Ch1 Error Value none Avg Volumetric VOL_U Ch1 DELTH Btu/lb J/gm

Ch1 SSUP none Avg +Totals TOT_U Ch2 Power POWER_U

Ch1 SSDN none Avg -Totals TOT_U Ch2 +Energy ENERGY_U

Ch1 SNDSP ft/s or m/s* Avg Tot Digits** none Ch2 –Energy ENERGY_U

Ch2 Velocity ft/s or m/s* Avg Totalizer Time seconds Ch2 TempS Deg F or C*

Ch2 Volumetric VOL_U Avg Error Value none Ch2 TempR Deg F or C*

Ch2 +Totals TOT_U Avg SSUP none Ch2 TS-TR Deg F or C*

Ch2 –Totals TOT_U Avg SSDN none Ch2 DELTH Btu/lb J/gm

Ch 2 Tot Digits** none Avg SNDSP ft/s or m/s*

*Metric or English units are determined by the setup of the XMT868 flow meter.

**Totalizer digits are available for informational purposes only. Respective totals are automatically scaled by

the Tot Digits value selected in the XMT flow meter setup.

VOL_U, TOT_U, POWER_U and ENERGY_U are determined by the units chosen for these measurements in the

setup for the XMT868 flow meter. See the instrument User's Manual for the setup of these parameters.

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November 2005

Configuration Utility

Setup

The following is an example setup using National Instruments

Configuration Utility v3.1.

Figure 2 below shows the Configuration Utility with an XMT868 flow

meter on the network (GE Flow-XMT).

Figure 2: Configuration Utility Setup Example

Note: The following procedures assume that the device has been placed

in the OOS (out-of-service) mode before executing.

Selecting the Desired

Measurements

To set the measurement unit for each AI:

1. Double click on the FLOW Transducer Block (in the tree under

GEFlow-XMT).

2. Select the Others tab and open the drop down list for the

PRIMARY_SELECTOR and SECONDARY_SELECTOR (see Figure 3 on

page 4).

3. Choose the unit from the list (see Figure 3 on page 4).

This unit will correspond to the unit that is available in the AI block for

network connection. The PRIMARY_SELECTOR unit will correspond to

ANALOG_INPUT_1 and the SECONDARY_SELECTOR will correspond to

ANALOG_INPUT_2.

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November 2005

Selecting the Desired

Measurements (cont.)

4. After the desired measurements have been selected for the PRIMARY

and SECONDARY SELECTOR, choose the unit system (UNIT_SELECTOR

above the PRIMARY_SELECTOR) that has been programmed in the

XMT868 (English or SI).

Figure 3: Primary Selector Drop Down List

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November 2005

Selecting Units for AI

Blocks

To select the units for the individual AI blocks:

1. Double click on the AI block for which you wish to set the units

(ANALOG_INPUT_1 or ANALOG_INPUT_2 in the tree under GEFlow-

XMT; see Figure 2 on page 3).

2. Select the Scaling tab and set the unit for the measurement based on

the XMT868 flow meter settings.

For example, if the XMT868 was set to use the metric unit system and the

PRIMARY_SELECTOR was set to use VELOCITY you would choose m/s for

the unit as shown in Figure 4 below.

Figure 4: Units Index Drop Down List

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November 2005

Resetting Instrument

Totalizers

To reset the instrument totalizers:

1. Double click on the FLOW transducer block (in the tree under GEFlow-

XMT; see Figure 2 on page 3).

2. Select the Others tab and scroll down to the CLEAR_TOTALIZERS

listing.

3. Select Clear from the drop down list box (see Figure 5 below).

4. After the totals have been reset, select Normal from the drop down list

box to resume total accumulation.

Figure 5: Clear Totalizers Drop Down List

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November 2005

Function Block

Application

Figure 6 below is an example setup using the Function Block Application

editor. The XMT868 AI blocks, along with the AO and PID of another

device on the network, are displayed. We have connected the AI_1 OUT of

the XMT868 to the CAS IN of the AO block. We have also connected the

AI_2 OUT of the XMT868 to the CAS IN of the PID block.

Figure 6: Function Block Application

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