GE XMT868 User manual

913-326A
November 2005
GE
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
J8
J9
123
FieldbusNet(+)
FieldbusNet(–)
OptionalShield
J8
•••
123
•
•
•
J9
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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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