Using Modbus Protocol
™
with the ALTUS
Net Oil Computer
Instruction Manual
November 2000
Using Modbus Protocol
™
with the ALTUS
Net Oil Computer
Instruction Manual
November 2000
For technical assistance, telephone the Micro Motion Customer
Service Department:
•In the United States, telephone 1 (800) 522-6277, 24 hours
•Outside the United States, telephone (303) 530-8400, 24 hours
•In Europe, telephone +31 (0) 318 549 443
•In Asia, telephone (65) 770-8155
Copyright © 2000 Micro Motion, Inc. A l l rig h ts reserved.
ALTUS is a trademark of Micro Motion , Inc.
Modbus is a registered trademark of Modicon , Inc.
Hastelloy is a registered trademark of Haynes International, Inc.
Monel is a registered trademark of Inco Alloys International, Inc.
Inconel is a registered trademark of Inco Alloys Inte rnational, Inc.
Teflon is a registered tradem ark of E.I. Du Pont de Nemours an d C om pany.
Halar is a registered tradem ark of Allied Chemical Corporation.
Tefzel is a registered trademark of E.I. Du Pont de Nemours and Com pany.
Contents
1 Using the NOC Screen . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Changing the communication parameters . . . . . . . . . . 1
Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Other communication parameters . . . . . . . . . . . . . . . . 2
2 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2 Mode of operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.3 Units of measurement . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.4 Well data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.5 Transient bubble remediation. . . . . . . . . . . . . . . . . . . . 6
3 Continuous Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Viewing well performance data . . . . . . . . . . . . . . . . . . . 9
3.3 Pausing and resuming production measurements. . . . 9
3.4 Resetting production measurements . . . . . . . . . . . . . 10
4 Well Test Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Conducting a well test . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3 Viewing a well test in progress . . . . . . . . . . . . . . . . . . 11
4.4 Viewing well test archives . . . . . . . . . . . . . . . . . . . . . . 11
5 Density Determination . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2 Determining the water density at
reference temperature . . . . . . . . . . . . . . . . . . . . . . 13
Measuring the water density and temperature . . . . . 13
Manually entering the water density
and temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3 Measuring the wet oil density and temperature . . . . 16
5.4 Entering the water cut of the oil . . . . . . . . . . . . . . . . . 18
5.5 Determining the dry oil density at
reference temperature . . . . . . . . . . . . . . . . . . . . . . 18
Using Modbus Protocol with the ALTUS Net Oil Computer
v
Contents
continued
6 Calibration and Trim . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2 Auto zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Diagnosing zeroing failure . . . . . . . . . . . . . . . . . . . . . . 20
6.3 Density calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Preparing the sensor for density calibration . . . . . . . 20
Low-density calibration . . . . . . . . . . . . . . . . . . . . . . . . 21
High-density calibration . . . . . . . . . . . . . . . . . . . . . . . 22
6.4 Temperature calibration . . . . . . . . . . . . . . . . . . . . . . . 23
6.5 Output trim. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7 Modbus Mapping Assignments . . . . . . . . . . . . . . . . . . . 25
Read/write coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Read-only discrete inputs. . . . . . . . . . . . . . . . . . . . . . . 27
Floating point register pairs . . . . . . . . . . . . . . . . . . . . 28
Input registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Holding registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
ASCII character strings . . . . . . . . . . . . . . . . . . . . . . . . 39
Integer codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Timecode reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
vi
Using Modbus Prot ocol with the ALTUS Net Oil Co m put er
1 Using the NOC Screen
1.1 Overview
1.2 Changing the communication parameters
Protocol
Configuration
Digital Comm
Protocol
Protocol
None
Modbus RTU
Modbus ASCII
This section describes how to use the screen of the
Series 3000 NOC to set up communication
parameters. For detailed screen use instructions,
refer to the ALTUS Net Oil Computer Manual.
You can change the following communication
parameters:
• Protocol
•Baud rate
•Parity
• Data bits
• Stop bits
• Slave address
• Byte order
To change the protocol:
1. Select
2. Select
3. Select
4. Select
5. Press
Configuration
Digital Comm
Protocol
.
Modbus RTU
EXIT
.
.
.
Modbus ASCII
or
.
SEL HELP EXIT
Using Modbus Protocol with the ALTUS Net Oil Computer
1
Using the NOC Screen
continued
Other communication parameters
Configuration
Digital Comm
Configuration
Configuration
Baud Rate ↓
1200
Parity
Odd
Data Bits
8
Stop Bits
1
CHG HELP EXIT
Table 1-1. Communication parameter values
To change all other communication parameters:
1. Select
2. Select
3. Select
Communication
Digital Comm
Configuration
.
.
.
4. Highlight the parameter you want to change
and press
CHG
. The possible values for each
parameter are listed in Table 1-1.
5. Press
EXIT
.
Parameter Values
Baud rate 1200, 2400, 4800, 9600, 19200, 38400
Parity None, Odd, Even
Data bits 7, 8
Stop bits 0, 1
Slave address 1–15, 32–47, 64–79, or 96–110
Byte order 1-2-3-4
3-4-1-2
2-1-4-3
4-3-2-1
2
Using Modbus Prot ocol with the ALTUS Net Oil Co m put er
2 Configuration
2.1 Overview
2.2 Mode of operation
The procedures in this section will enable you to configure the
following Series 3000 NOC parameters:
• Mode of operation
• Units of measurement
•Well data
• Transient bubble remediation
The NOC operates in either continuous mode or well test mode.
To view the current mode of operation, examine discrete
input 10259. If the discrete input is ON, the NOC is in continuous
mode. If the discrete input is OFF, the NOC is in well test mode.
To change the mode of operation:
1. If you want to set the mode of operation to continuous mode, then
set coil 00285 to ON.
2. If you want to set the mode of operation to well test mode, then set
coil 00286 to ON.
For Modbus procedures in continuous mode, refer to Continuous
Mode, page 9. For Modbus procedures in well test mode, refer to
Well Test Mode, page 11.
Table 2-1. Modbus addresses for mode of operation
Address Address Type Description Values
1 0259 Read-only
discrete input
0 0285 Read/write coil Enable continuous run mode ON, changes the mode of
0 0286 Read/write coil Enable well test mode ON, changes the mode of
Using Modbus Protocol with the ALTUS Net Oil Computer
NOC is in continuous mode • ON, the NOC is in
continuous mode
•OFF, the NOC is in well-test
mode
operation to
operation to
continuous
well test
3
Configuration
continued
2.3 Units of measurement
You can use Modbus protocol to select the temperature units the
NOC will use for measuring net oil and net water.
To set the temperature units of measurement, set holding
register 41705 to the desired units integer code. For integer codes,
refer to Temperature Unit Codes, page 42
Table 2-2. Modbus addresses for units of measurement
Address Address Type Description Values
4 1705 Holding register Reference temperature index Integer code for one of the four
possible temperature units
2.4 Well data
Using Modbus protocol, you can set oil and water densities and
deviations for a well.
The well which will be affected by changing the parameters below
depends on the mode in which the NOC is operating:
• If the NOC is operating in continuous mode, the parameters below
will affect the current well.
• If the NOC is operating in well test mode, you must select the well
you want to configure before changing the parameters below. Set
holding register 41701 to the number of the well you want to
configure.
You can set the following well data parameters:
• Well name (well test mode only)
• Oil density
•Water density
• Purge time (well test mode only)
• Oil deviation
• Water deviation
• Oil density averaging duration
• Water density averaging duration
Well name
You can only change the well name while the NOC is in well test
mode. The well name can be up to 16 characters long. To set the well
name, enter the name across ASCII character registers
52306–52313. Each ASCII character register can hold 2 characters.
Oil density
To set the oil density for the well, set floating-point register pair
21675–21676 to the known oil density, in g/cc, at reference
temperature. If you perform a density determination, the oil density
from the density determination will be automatically placed into
these registers (see Density Determination, page 13).
4
Using Modbus Prot ocol with the ALTUS Net Oil Co m put er
Configuration
continued
Water density
To set the water density for the well, set floating-point register pair
21679–21680 to the known water density, in g/cc, at reference
conditions. If you perform a density determination, the water
density from the density determination will be automatically placed
into these registers (see Density Determination, page 13).
Purge time
You can only set the purge time for the well while the NOC is in well
test mode. To set the purge time, set holding register 41693 to the
amount of time that the NOC will allow the separator contents from
the previous test to purge.
Oil deviation
To set the oil deviation, set floating-point register pair 21677–21678
to the maximum oil density deviation, in g/cc, that will be allowed
during density determination. Oil densities that fall outside of this
deviation limit will cause the NOC to restart the density
determination.
Water deviation
To set the water deviation, set floating-point register pair
21681–21682 to the maximum water density deviation, in g/cc, that
will be allowed during density determination. Water densities that
fall outside of this deviation limit will cause the NOC to restart the
density determination.
Oil density averaging duration
To set the oil averaging duration, set holding register 41691 to the
length of time you want the oil density to be averaged during
density determination (see Density Determination, page 13).
Water density averaging duration
To set the water averaging duration, set holding register 41692 to
the length of time you want the produced water density to be
averaged during density determination (see Density Determination,
page 13).
Using Modbus Protocol with the ALTUS Net Oil Computer
5
Configuration
continued
Table 2-3. Modbus addresses for well data
Address Address Type Description Values
5 2306
5 2307
5 2308
5 2309
5 2310
5 2311
5 2312
5 2313
2 1675
2 1676
2 1677
2 1678
2 1679
2 1680
2 1681
2 1682
4 1691 Holding register Time during which live oil density will be
4 1692 Holding register Time during which produced water density
4 1693 Holding register Purge time for the NOC to allow the
ASCII character
string
Floating-point
register pair
Floating-point
register pair
Floating -point
register pair
Floating-point
register pair
1st pair of characters of well name
2nd pair of characters of well name
3rd pair of character of well name
4th pair of characters of well name
5th pair of characters of well name
6th pair of characters of well name
7th pair of characters of well name
8th pair of characters of well name
Density of oil at reference temperature Known density of oil, in g/cc
Maximum deviation of oil density during
density determination
Density of water at reference temperature Known density of water, in g/cc
Maximum deviation of water density during
density determination
averaged during density determination
will be averaged during density
determination
separator contents of the previous test to
purge
Any ASCII characters—the
combined strings make up the
name of the well
Limit in g/cc, beyond which
density determination will be
restarted
Limit in g/cc, beyond which
density determination will be
restarted
Length of time, in seconds
Length of time, in seconds
Length of time, in seconds
2.5 Transient bubble
remediation
6
Transient bubble remediation corrects density and water cut
readings during brief periods when gas bubbles are passing through
the sensor.
To set the transient bubble remediation:
1. Set floating-point register pair 21683–21684 to the drive gain
level, in volts, above which the NOC will indicate transient
bubbles.
2. Set holding register 41706 to the integer code for one of the
following three states (for integer codes, refer to TBR Event
Action, page 44):
• Hold last value—When transient bubbles are detected, the
NOC will hold its last good value.
• Stop well test—The NOC will stop the well test if transient
bubbles are detected.
• Alarm only—The NOC will report an alarm on discrete
output 1.
3. If you selected Hold last value in Step 2, then set holding
register 41694 to the amount of time, in seconds, that the NOC
should use before transient bubbles were detected to derive a
density value.
Using Modbus Prot ocol with the ALTUS Net Oil Co m put er
Configuration
continued
Table 2-4. Modbus addresses for transient bubble remediation
Address Address Type Description Values
2 1683
2 1684
4 1694 Holding register Action taken •0 hold last value
4 1706 Holding register Time period Time, in seconds, the NOC
Floating-point
register pair
Drive gain level Level, in volts, above which the
NOC indicates t he presence o f
transient bubbles
• 1 stop well test
• 2 alarm only
should use before detecting
transient bubbles to derive a
density value
Using Modbus Protocol with the ALTUS Net Oil Computer
7
8
Using Modbus Proto col w i th th e ALTUS Net Oil Computer
3 Continuous Mode
3.1 Overview
3.2 Viewing well performance
data
3.3 Pausing and resuming
production measurements
The procedures in this section will enable you to use the Series 3000
NOC in continuous mode to:
• View well performance data
• Pause and resume accumulated production measurements
• Reset production measurements
Well performance data include such information as test start time,
elapsed test time, flow rates, and accumulated totals. To view well
performance data, examine floating-point register pairs
21537–21822. Refer to Floating point register pairs, page 28, for
descriptions of each of the registers.
The NOC accumulates production measurements unless it is
instructed to suspend its accumulation. To pause the accumulation
of production measurements, set coil 00269 to ON. To resume the
accumulation of production measurements, set coil 00270 to ON.
While the accumulation of production measurements is paused, you
can view how long the accumulation has been paused by examining
floating-point register pair 21713–21714.
Table 3-1. Modbus addresses for pausing and resuming accumulation of production measurements
Address Address Type Description Values
0 0269 Read/write coil Pause production measurements ON, pause the accumulation
of production measurements
0 0270 Read/write coil Resume production measurements ON, resumes the
2 1713
2 1714
Floating-point
register pair
Paused time Length of time that prod uction
accumulation of production
measurements
measurements have been
paused
Using Modbus Protocol with the ALTUS Net Oil Computer
9
Continuous Mode
continued
3.4 Resetting production
measurements
You can reset any of the accumulated production measurements by
setting the associated Modbus read/write coil to ON. The production
measurements and their associated reset coil are listed in Table 3-2.
Table 3-2. Reset coils for production measurements
Production measurement Reset coil
All measurements 00271
Back flow 00272
Density 00273
Drive gain 00274
Gross flow 00275
Mass flow 00276
Net oil 00277
Net water 00278
Temperature 00279
Uncorrected gross 00280
Uncorrected oil 00281
Uncorrected water 00282
Uncorrected water cut 00283
Water cut 00284
10
Using Modbus Prot ocol with the ALTUS Net Oil Co m put er
4 Well Test Mode
4.1 Overview
4.2 Conducting a well test
The procedures in this section will enable you to:
• Conduct a well test
• View a well test in progress
• View well test archives
To conduct a well test:
1. Set holding registers 41703 and 41704 to zero.
2. Set holding registers 41701 and 41702 to the number of the well
to be tested.
3. Start the test with or without a leading purge time. The leading
purge time is defined in holding register 41693.
• To start the test with a leading purge time, set
coil 00287 to ON.
• To start the test without a leading purge time, set
coil 00289 to ON.
Note: To stop a purge, set coil 00288 to ON. To stop a test, set
coil 00290 to ON. The results of the test, even if it is stopped
before completing, will be saved to the well test archive.
4. If you started the test with a leading purge time, monitor discrete
input 10331. This discrete input will be ON while the purge is in
progress.
When the test is complete, you can review the well performance
data, the test start time, and the test elapsed time by examining
floating-point register pairs 21537–21822. Refer to Floating point
register pairs, page 28, for descriptions of individual registers.
4.3 Viewing a well test in
progress
4.4 Viewing well test archives
Using Modbus Protocol with the ALTUS Net Oil Computer
To view a well test in progress, set floating-point register pair
21703–21704 to zero and examine registers 21537–21822. Refer to
Floating point register pairs, page 28, for descriptions of individual
registers.
To view the test archive for a particular well:
1. Set holding register 41703 to the archive you want to view.
2. Set holding register 41704 to the number of the well within the
archive that you want to view.
Floating-point register pairs 21537–21822 will show well
performance data for the specified well test. Refer to Floating point
register pairs, page 28, for descriptions of individual registers.
11
12
Using Modbus Proto col w i th th e ALTUS Net Oil Computer
5 Density Determination
5.1 Overview
5.2 Determining the water density at reference
temperature
Measuring the water density and temperature
Density determination involves the following
procedures:
• Determining the water density at reference
temperature
• Measuring the wet oil density and temperature
• Entering the water cut of the oil
• Determining the dry oil density at reference
temperature
The water density at reference temperature can
be determined by either of the following
procedures:
• Measuring the water density and temperature
• Manually entering the water density and
temperature
To measure the water density and temperature:
1. Switch in the well to be determined, making
sure the production fluid from the previous
well has been completely purged.
2. Switch out the well that is connected to the test
separator.
3. Close the outlet valve downstream from the
sensor. Wait for the phases to separate in the
separator. The separation usually requires
5–15 minutes. See Figure 5-1, page 14.
4. Open the outlet valve to allow the free water
accumulated in the separator to flow through
the sensor.
5. Monitor the density and temperature,
watching for the readings to stabilize.
6. Set coil 00323 to ON to start the density and
temperature average.
7. Monitor discrete input 10331. This discrete
input will be ON when the density calculation
is completed.
8. Examine floating-point register pairs
21831–21832 and 21833–21834 to review the
calculated results.
9. Set coil 00325 to ON to save the results.
Using Modbus Protocol with the ALTUS Net Oil Computer
13
Density Determination
continued
Figure 5-1. Stratification with no flow
Oil
Emulsion layer
Water
Sensor
Outlet valv e
Table 5-1. Modbus addresses for water density measurement
Address Address Type Description Values
0 0323 Read/write coil Start water density measurement ON, start water density
1 0331 Discrete input Density operation complete flag ON, density operation
2 1831
2 1832
2 1833
2 1834
0 0325 Read/write coil Save results from calculated water density
Manually entering the water density and
temperature
Floating point
register pair
Floating point
register pair
Container for density used in density determination
calculations
Container for temperature used in density
determination calculations
measurement
If the separator does not contain enough water to
determine a stable flowing density, use the
manual entry method to determine water density
and temperature.
To determine water density by manually entering
density and temperature values:
1. Switch in the well to be determined, making
sure that the production fluid from the
previous well has been completely purged.
2. Switch out the well that is connected to the test
separator.
3. Close the outlet valve downstream from the
sensor. Wait for the phases to separate in the
separator. The separation usually requires 5 to
15 minutes. See Figure 5-2, page 15.
4. Take a water sample from the bottom of the
test separator or the water trap. See
Figure 5-2, page 15.
measurement
finished
Density result of calculation
Temperature result of
calculation
ON, save the calculation
results
14
Using Modbus Prot ocol with the ALTUS Net Oil Co m put er
Density Determination
continued
5. Place a lid on the sample container and allow
the sample to cool to near-ambient
temperature.
6. Use a hygrometer to measure the water density
and a thermometer to measure the water
temperature.
7. Enter the density of the water sample in
floating-point register pair 21831–21832.
8. Enter the temperature of the water sample in
floating-point register pair 21833–21834.
9. Enter density of the water sample in
floating-point register pair 21839–21840.
10. Set coil 00320 to ON to start the density
calculation.
11. Examine floating-point register pair
21839–21840 to view the result of the
calculation.
12. Set coil 00321 to ON to save the result of the
calculation.
Figure 5-2. Taking a water sample from the separator
Oil
Oil
Emulsion layer
Water
Water sample container
Sensor
Outlet valve
Using Modbus Protocol with the ALTUS Net Oil Computer
15
Density Determination
continued
Table 5-2. Modbus addresses for manually determining water density
Address Address Type Description Values
2 1831
2 1832
2 1833
2 1834
0 0320 Read/write coil Calculate water density from manually
2 1839
2 1840
0 0321 Read/write coil Saves results from calculated water
Floating point
register pair
Floating point
register pair
Floating point
register pair
Container for density used in density
determination calculations
Container for temperature used in
density determination calculations
entered values
Container for results from manual
water density calculation
density
Known density of water sample
Known temperature of water sample
ON, start density calculation
Water density at reference
temperature
ON, save calculation result
5.3 Measuring the wet oil density and
temperature
To measure the wet oil density and temperature:
1. Allow the fluid level in the separator to drop by
continuing to drain water from the bottom of
the stratified separator, through the outlet
valve.
2. Monitor the density until it stabilizes at a
density value that indicates oil is flowing
through the sensor.
3. Set coil 00326 to ON to start the oil density
calculation.
4. Monitor discrete input 10331. This discrete
input will be ON when the density calculation
is completed.
5. While oil density and temperature are being
averaged, take a sample for use in entering the
water cut. See Figure 5-3, page 17.
Note: As an alternative, the reading from a
water cut probe can be averaged while the oil
density and temperature are being averaged.
6. Examine floating-point register pair
21831–21832 to view the density calculation
result.
7. Examine floating-point register pair
21833–21834 to view the temperature
calculation result.
8. Set coil 00328 to ON to save the results of the
calculation.
16
Note: The NOC will not begin using the most
recently averaged oil density until a water
cut value has been entered as instructed
under Entering the water cut, page 18.
Using Modbus Prot ocol with the ALTUS Net Oil Co m put er
Density Determination
continued
Figure 5-3. Taking an oil sample
Oil pad
Outlet valve
Sensor
Oil sample for use in
measuring water cut
Table 5-3. Modbus addresses for measuring wet oil density
Address Address Type Description Va lues
0 0326 Read/write coil Start oil density measurement ON, start density and
1 0331 Discrete input Density operation complete flag ON, density operation
2 1831
2 1832
2 1833
2 1834
0 0328 Read/write coil Save intermediate results from oil density
Floating-point
register pair
Floating-point
register pair
Container fo r dens ity used in den si ty
determination calculations
Container for temperature used in density
determination calculations
determination measurement
temperature calculation
finished
Density result of the
calculation
Tempe rature result of the
calculation
ON, save the calculation
results
Changing the density internal damping in
floating-point register pair 20193–20194 from its
default of 1.7 seconds may adversely change the
operation of the density determination routines.
It is advised to leave the density internal damping at the
default value when performing a density determination.
Using Modbus Protocol with the ALTUS Net Oil Computer
CAUTION
17
Density Determination
continued
5.4 Entering the water cut of the oil
After the average oil density has been saved, enter
the water cut of the oil.
To enter the water cut of the oil:
1. Use a standard procedure (centrifuge,
distillation, Karl-Fischer) to measure the water
cut in volume percent from the sample taken
during oil density determination. See Step 5,
page 16.
Note: As an alternative, enter the average
water cut probe reading determined during
oil density determination.
2. Enter the water cut percentage in
floating-point register pair 21835–21836.
Table 5-4. Modbus addresses for entering the water cut
Address Address Type Description Values
2 1835
2 1836
Floating -point
register pair
Container for water cut percentage used in
density determination calculations
Measured water cut in
volume percent
5.5 Determining the dry oil density at reference
temperature
To determine the dry oil density at reference
temperature:
1. Set coil 00329 to ON to start the calculation.
2. Examine floating-point register pair
21855–21856 to view the results of the
calculation.
3. Set coil 00330 to ON to save the oil density at
reference temperature.
Table 5-5. Modbus addresses for determining dry oil density
Address Address Type Description Values
0 0329 Read/write coil Calculate actual oil density at reference from
oil density measurement and user supplied
water cut
2 1855
2 1856
0 0330 Read/write coil Save actual oil density at reference ON, save calculation
Floating -point
register pair
Results from calculation of oil density at
reference
ON, calculate actual oil
density at reference
Density result of the
calculation
results
18
Using Modbus Prot ocol with the ALTUS Net Oil Co m put er
6 Calibration and Trim
6.1 Overview
6.2 Auto zero
Calibration and trim involve the following three
procedures:
•Auto zero
• Density calibration
• Temperature calibration
• Output trim
Auto zero establishes sensor zero by measuring
the offset of the flow signal during zero flow
conditions.
To perform the zero procedure:
1. Fill the sensor completely.
2. Close the shutoff valve downstream from the
sensor. Flow through the sensor must be
completely stopped to enable accurate zeroing.
3. If possible, shut off mechanical noise sources
such as motors, pumps, and valves.
4. Examine floating-point register pair
20233–20234 to view the current zero values.
5. Set holding register 40136 to the desired
maximum zero time.
6. Set coil 00005 to ON to start the auto zero
calculation.
7. Monitor bit 14 of input register 30126. This bit
will be ON while the auto zero calculation is in
progress.
Using Modbus Protocol with the ALTUS Net Oil Computer
Note: To abort the auto zero calculation, set
coil 00005 to OFF.
19
Calibration and Trim
continued
8. Examine bits 8–10 of input register 30126 to
determine success or failure of the auto zero
calculation. For each bit, a value of zero
indicates success.
9. Examine floating-point register pair
20233–20234 to view the new zero values.
Table 6-1. Modbus addresses for auto zero
Address Address Type Description Values
2 0233
2 0234
4 0136 Holding register Maximum zero time Longest time to keep trying the
0 0005 Read/write coil Perform flow meter zeroing ON, starts the auto zero
3 0126 Input register Container for transmitter alarm codes •Bit #8 Calibration failure
Floating-point
register pair
Container for the flow signal offset at zero
flow
Results of the auto zero
calculation
auto zero calculation
calculation
•Bit #9 Zero too low
•Bit #10 Zero too high
Diagnosing zeroing failure
6.3 Density calibration
Preparing the sensor for density calibration
The following are the most common sources of
zeroing failure:
• Flow of fluid through sensor during zeroing
• Flow tubes not completely filled with fluid
during zeroing
• Mechanical noise from equipment such as
motors, pumps, or valves
• Inappropriate zero time or standard deviation
Modbus protocol can be used for performing a
two-point density calibration in the field. The
procedure includes a low-density calibration and a
high-density calibration. Before performing the
low-density or high-density calibration, you must
prepare the sensor for calibration.
To prepare the sensor for density calibration:
1. Use produced water to flush the flow line.
2. Remove the sensor from the flow line.
3. Drain the fluid from the sensor.
4. Rinse the sensor tubes with toluene at least
twice, then rinse the tubes with acetone at
least twice. Use another oil solvent if toluene or
acetone is not available.
20
Using Modbus Prot ocol with the ALTUS Net Oil Co m put er
Calibration and Trim
continued
5. Use compressed air to blow the sensor dry until
residual acetone or other solvent has been
completely evaporated.
6. If sensor wiring was disconnected at step 2,
reconnect the wiring and cycle power off, then
on.
7. Wait approximately 5 minutes for the sensor
flow tubes to achieve the ambient air
temperature.
Low-density calibration
To perform the low-density calibration:
1. Fill the sensor with a low-density material
(e.g., air).
2. If possible, shut off the flow. Otherwise, pump
the material through the sensor at the lowest
flow rate allowed by the process.
3. Use any established method to derive an
accurate density, in g/cc, for the fluid at line
conditions.
4. Enter the fluid density in floating-point
register pair 20155–20156.
5. Set coil 00013 to ON to start the density
calculation.
6. Monitor bit 14 of input register 30126. This bit
will be ON while the density calculation is
occurring.
7. Examine bit 8 of input register 30126 to
determine whether the calibration failed or
succeeded. A value of zero indicates success.
Table 6-2. Modbus addresses for low-density calibration
Address Address Type Description Values
2 0155
2 0156
0 0013 Read/write coil Perform low-density calibration ON, start density calculation
3 0126 Input register Container for transmitter alarm codes •Bit #8 Calibration failure
Floating-point
register pair
Container for density for low-density
calibration (g/cc)
Known density of the low-density
fluid
• Bit #14 Zeroing in progress
Using Modbus Protocol with the ALTUS Net Oil Computer
21
Calibration and Trim
continued
High-density calibration
To perform the high-density calibration:
1. Fill the sensor with a high-density fluid
(e.g., water).
2. If possible, shut off the flow. Otherwise, pump
the fluid through the sensor at the slowest flow
rate allowed by the process.
Note: To ensure stable density, make sure the
fluid in the flow tubes remains completely
free of gas bubbles during the calibration.
3. Use any established method to derive an
accurate density, in g/cc, for the fluid at line
conditions.
4. Enter the fluid density in floating-point
register pair 20157–20158.
5. Set coil 00014 to ON to start the density
calculation.
6. Monitor bit 14 of input register 30126. This bit
will be ON while the density calculation is
occurring.
7. Examine bit 8 of input register 30126 to
determine whether the calibration failed or
succeeded. A value of zero indicates success.
8. Examine floating-point register pairs
20155–20156, 20157–20158, 20159–20160, and
20161–20162 for the results of the density
calculation.
Table 6-3. Modbus addresses for high-density calibration
Address Address Type Description Values
0 0014 Read/write coil Perform high-density calibration ON, start density calculation
3 0126 Input register Container for transmitter alarm codes •Bit #8 Calibration failure
2 0155
2 0156
2 0157
2 0158
2 0159
2 0160
2 0161
2 0162
Floating -point
register pair
Floating-point
register pair
Floating-point
register pair
Floating-point
register pair
Density for low-density calibration (g/cc) Known density of low-density
Density for high-density calibration (g/cc) Known density of high-density
Density calibration constant 1 (µsec) Results of density calculation
Density calibration constant 2 (µsec) Results of density calculation
• Bit #14 Zeroing in progress
fluid
fluid
22
Using Modbus Prot ocol with the ALTUS Net Oil Co m put er
Calibration and Trim
continued
6.4 Temperature calibration
Table 6-4. Modbus addresses for temperature calibration
Modbus protocol can be used for performing a
temperature calibration in the field.
To perform a temperature calibration:
1. Fill the sensor with a low-temperature fluid
and allow the sensor to achieve thermal
equilibrium.
2. Set floating-point register pair 20151–20152 to
the temperature of the low-temperature fluid.
3. Set coil 00015 to ON to perform the
temperature offset calculation.
4. Fill the sensor with a high-temperature fluid
and allow the sensor to achieve thermal
equilibrium.
5. Set floating-point register pair 20151–20152 to
the temperature of the high-temperature fluid.
6. Set coil 00016 to ON to perform the
temperature slope calculation.
7. Examine floating-point register pairs
20411–20412 and 20413–20414 for the results
of the temperature calibration.
Address Address Type Description Values
2 0151
2 0152
0 0015 Read/write coil Perform low-temperature calibration ON, start temperature
0 0016 Read/write coil Perform high-temperature calibration ON, start temperature
6.5 Output trim
Floating-point
register pair
Container for temp erature f or te mperatu re
calibration
Output trim adjusts the transmitter’s
Known temperature of the
process fluid
calculation
calculation
digital-to-analog converter to match primary and
secondary milliamp outputs with a specific
reference standard, receiver, or readout device.
To perform a milliamp output trim:
1. Set floating-point register pair 20143–20144 to
the 4.0 mA point.
2. Set coil 00010 to ON to fix the mA output.
3. Enter the mA reference reading in
floating-point register pair 20143–20144.
4. Set coil 00006 to ON to trim the output.
5. Set floating-point register pair 20143–20144 to
the 20.0 mA point.
6. Set coil 00010 to ON to fix the mA output.
Using Modbus Protocol with the ALTUS Net Oil Computer
23
Calibration and Trim
continued
7. Enter the mA reference reading in
floating-point register pair 20143–20144.
8. Set coil 00007 to ON to trim the output.
9. Set floating-point register pair 20143–20144
to 0.0.
10. Set coil 00010 to ON to release the mA output.
You can trim the secondary mA output by
substituting the Modbus addresses listed in
Table 6-5.
Table 6-5. Substitution mA trim registers
If the address for the primary mA output is: Use this address for the secondary mA output:
20143–20144 20145–20146
00010 00011
00006 00008
00007 00009
Table 6-6. Modbus addresses for output trim
Address Address Type Description Values
2 0143
2 0144
0 0010 Read/write coil Fix current l evel from primary mA output ON, fix mA output
0 0006 Read/write coil Tr im primary mA output at 4.0 mA ON, trim mA output
0 0007 Read/write coil Tr im primary mA output at 20.0 mA ON, trim mA outpu t
Floating-point
register pair
Fixed current for primar y mA output test
(milliamps)
Value at 4.0 mA or 20.0 mA
24
Using Modbus Prot ocol with the ALTUS Net Oil Co m put er
7 Modbus Mapping Assignments
Read/write coils
Address Description
0 0003 Reset all totalizers
0 0004 Reset all inventories
0 0005 Perform flowmeter zeroing
0 0006 Trim primary mA output at 4 mA
0 0007 Trim primary mA output at 20 mA
0 0008 Trim secondary mA output at 4 m A
0 0009 Trim secondary mA output at 20 m A
0 0010 F ix current level from primary mA output
0 0011 F ix current level from secondary mA output
0 0012 Fi x fre quency from frequency/pul se output
0 0013 Perform low-density calibration
0 0014 Perform high-d ensity calibration
0 0015 Perform temperature offset calibration
0 0016 Perform temperature slope calibration
0 0018 Perform third-point density (FD) calibration
0 0056 Reset mass total
0 0057 Reset line volume (gross vo lume) total
0 0150 Enable C oriolis
0 0151 Enable sensor alarms
Using Modbus Protocol with the ALTUS Net Oil Computer
25
Modbus Mapping Assignments
continued
Read/write coils (continued)
Address Description
0 0269 Pause production measurements
0 0270 Resume production meas ur em ents
0 0271 Reset all production measurements
0 0272 Reset back flow
0 0273 Reset density
0 0274 Reset drive gain
0 0275 Reset gross flow
0 0276 Reset mass flow
0 0277 R eset net oil rate (min/max/ avg)
0 0278 Reset net water cut (min/max/avg)
0 0279 Reset temperature
0 0280 Reset uncorrected gross
0 0281 Reset uncorrected oil
0 0282 R eset uncorrected water
0 0283 R eset uncorrected water cu t
0 0284 Reset water cut
0 0285 Enable continuous run mode
0 0286 Enable well test mode
0 0287 Start purge
0 0288 Stop purge
0 0289 Start well test
0 0290 Stop well test
0 0295 Start determination of oil density
0 0296 St op determination of oi l dens i ty
0 0297 St art determination of produced water density
0 0298 St op determination of pr oduced water density
0 0320 C al culate water density from m anual l y en te red values
0 0321 Save results from calculated water density
0 0322 Reset density determination volume total
0 0323 S t art water density determinatio n m easurement
0 0324 Abort water density determination m easurement
0 0325 Save results from water den si ty det ermination meas ur em ent
0 0326 St art oil density de te rmination measurement
0 0327 Abort oil densit y det ermination meas ur em ent
0 0328 Save interm ediate results from old den si ty det ermination meas ur em ent
0 0329 C al culate actual oil density at reference from oil density mea su rement and user supplied water cut
0 0330 Save actual oil dens i ty at reference
26
Using Modbus Protoco l wit h th e AL TU S Net O il Co m put er
Modbus Mapping Assignments
continued
Read-only discrete inputs
Address Description
1 0021 (E )EPROM checksum failure
1 0022 RAM diagnostic failure
1 0023 Real-time interrupt failure
1 0024 Sensor failure
1 0025 Temperature sensor failure
1 0026 Flowmeter zeroing failure
1 0027 Undefined
1 0028 Transmitter initializing/warming up
1 0029 Primary variable out of range
1 0030 N on-primary variable out of range
1 0031 Milliamp output(s) saturated
1 0032 Milliamp output(s) fixed
1 0033 Watchdog timer error
1 0034 Power reset occurred
1 0035 Undefined
1 0036 Transmitter electronics failure
1 0259 NO C i s in continuous mode
1 0260 NOC is in pause mode
1 0300 Configuration memory initialized; NOC not configured
1 0301 N O C configuration corru pt ed
1 0302 NOC configuration mismatched
1 0303 NOC configuration invalid
1 0304 Temperature out of range
1 0305 Density out of range (slug flow) warni ng
1 0306 Density out of range (slug flow) alarm
1 0307 Continuous-mode measurements paused for more than 15 minutes
1 0308 Transient bubbles in sensor (TBR) warning
1 0309 Transient bubbles in sensor (TBR) alarm
1 0310 D ensity calculation erro r
1 0311 Purge in prog ress
1 0331 Density operation complete flag (ON = finished)
Using Modbus Protocol with the ALTUS Net Oil Computer
27
Modbus Mapping Assignments
continued
Floating point register pairs
Address Description
2 0141 0142 Sl ug duration (seconds)
2 0143 0144 Fi xed current for primary mA output tes t (m ill iamps)
2 0145 0146 Fi xed current for secondary mA output test (mi lliam ps)
2 0147 0148 Fi xed frequency for frequency/output test (Hertz)
2 0151 0152 Temperature for temperature offset/slop e cali brat i ons
2 0155 0156 Density for low-density calibration (g/cc)
2 0157 0158 Density for high-density cal ib ratio n (g/cc)
2 0159 0160 Density calibration constant 1 (µsec)
2 0161 0162 Density calibration constant 2 (µsec)
2 0163 0164 D ensity temperature coeffici ent
2 0165 0166 H i gh m as s f low lim it of sensor
2 0167 0168 H i gh t em p erat ur e l imi t of sensor
2 0169 0170 High density limit of sensor (g/cc)
2 0171 0172 H i gh volume flow lim i t of se nsor
2 0173 0174 Low mass flow limit of sensor
2 0175 0176 Low tem perature limit of sensor
2 0177 0178 Low density limit of senso r (g /c c)
2 0179 0180 Low volume fl ow limit of sensor
2 0181 0182 Mass flow minimum range
2 0183 0184 Temperature minimum range
2 0185 0186 D ensity minimum range
2 0187 0188 Volume flow minimum range
2 0189 0190 Fl ow rate inte rnal damping (sec onds)
2 0191 0192 Temperature internal damping (seconds)
2 0193 0194 D ensity internal damping (seconds)
2 0195 0196 M ass flow cutoff for frequency/pulse output
2 0197 0198 Volume flow cutoff for frequency/pulse output
2 0199 0200 Sl ug flow high-density limit (g/cc)
2 0201 0202 Sl ug flow low-density limit (g/cc)
2 0203 0204 Primary mA output present current (mi l lia m ps)
2 0205 0206 Added damping on prim ary mA output (sec onds)
2 0207 0208 Fl ow cu toff for pri m ary mA output
2 0209 0210 Primary variable at 20 m A/High current level for primary mA event
2 0211 0212 Primary variable at 4 mA/Low cur re nt level for primary m A event
2 0213 0214 Secondary mA output present current (milliamps)
2 0215 0216 Added damping on seconda ry mA output (seco nds)
2 0217 0218 Fl ow cu toff for secondary mA output
2 0219 0220 Secondary variable at 20 mA/ hi gh cur re nt level for secondary m A event
2 0221 0222 Secondary variable at 4 mA/ l ow cur re nt level for secondary m A event
2 0223 0224 Frequency setpoint or number of pulse s (Hz)
2 0225 0226 Fl ow rate or total re pr esented by frequency or number of pulses
2 0227 0228 Frequency pulse width (milliseconds)
2 0229 0230 Frequency/pul se output present frequency (H z)
28
Using Modbus Protoco l wit h th e AL TU S Net O il Co m put er
Modbus Mapping Assignments
continued
Floating point register pairs (continued)
Address Description
2 0231 0232 Fl owmet er zeroing standard deviation
2 0233 0234 Pr esent flow signal offset at zero flow
2 0245 0246 1 (E)EPROM checksum failure
2 RAM diagnostic failure
4 Sensor failure
8 Temperature sensor failu re
16 Inpu t overrange
32 Frequency/pulse output saturated
64 Transmitter not conf igured
128 Real-time interrupt failure
256 Primary mA out put saturated
512 Secondary mA out put saturated
1024 Primary mA output fixed
2048 Secondary m A out put fixed
4096 Density overrange
8192 Calibration failure
16384 Zero value too low
32768 Zero value too high
65536 Transmit te r el ec t ronics failure
131072 Flowmeter zeroing in progress
262144 Slug flow
524288 Power reset occurred
1048576 Undefined
2097152 Transmit te r i ni tializing/warming up
2 0247 0248 Mass flow rate
2 0249 0250 D ensity
2 0251 0252 Temperature
2 0253 0254 Volume flow rate
2 0259 0260 M ass total
2 0261 0262 Volume total
2 0263 0264 M ass inventory
2 0265 0266 Volume inventory
2 0277 0278 D ensity for FD calibration (g/cc)
2 0279 0280 M ass rate factor
2 0281 0282 Volume rate factor
2 0283 0284 D ensity rate factor
2 0285 0286 Raw tube frequency (Hz)
2 0291 0292 D rive gain
2 0293 0294 Mass flow live zero flow
Using Modbus Protocol with the ALTUS Net Oil Computer
29
Modbus Mapping Assignments
continued
Floating point register pairs (continued)
Address Description
2 0303 0304 Fl owing density constant
2 0407 0408 Fl ow ca libra tion factor
2 0409 0410 Temperature coefficient for flow
2 0411 0412 Temperature calibration slope
2 0413 0414 Temperature calibration offset
2 1101 1102 Frequency output pulses/unit
2 1103 1104 Frequency output units/pulse
2 1109 1110 Primary mA fault setting value
2 1111 1112 Secondary mA fault setting value
2 1537 1538 Actual back flow rate
2 1539 1540 Act ual density
2 1541 1542 Act ual drive gain
2 1543 1544 Act ual gross flow rate
2 1545 1546 Act ual mass flow rate
2 1547 1548 Actual net oil flow rate
2 1549 1550 Actual net water flow rate
2 1551 1552 Act ual temperature
2 1553 1554 Actual uncorrected net oil flow rate
2 1555 1556 Actual uncorrected net water cut
2 1557 1558 Actual water cut
2 1567 1568 Average back flow rate
2 1569 1570 Average density
2 1571 1572 Average drive gain
2 1573 1574 Average gross flow rate
2 1575 1576 Average mass flow rate
2 1577 1578 Average net oil flow rate
2 1579 1580 Average net water flow rate
2 1581 1582 Average temperature
2 1583 1584 Average uncorrected net oil flow rate
2 1585 1586 Average uncorrected net water cut
2 1587 1588 Average water cut
2 1597 1598 Maximum back flow rate
2 1599 1600 Maximum density
2 1601 1602 Maximum drive gain
2 1603 1604 Maximum gross flow rate
2 1605 1606 Maximum mass flow rate
2 1607 1608 Maximum net oil flow rate
2 1609 1610 Maximum net water flow rate
2 1611 1612 Maximum temperatu re
2 1613 1614 Maximum uncorre ct ed net oil flow rate
2 1615 1616 Maximum uncorrected net water cut
2 1617 1618 Maximum water cut
30
Using Modbus Protoco l wit h th e AL TU S Net O il Co m put er
Modbus Mapping Assignments
continued
Floating point register pairs (continued)
Address Description
2 1627 1628 Minimum back flow rate
2 1629 1630 M i ni mum density
2 1631 1632 M i ni mum drive gain
2 1633 1634 Minimum gross flow rate
2 1635 1636 Minimum mass flow rate
2 1637 1638 Minimum net oil flow rate
2 1639 1640 Minimum net water flow rate
2 1641 1642 M i ni mum t em perature
2 1643 1644 M i ni mum uncorrected net oil flow rate
2 1645 1646 M i ni mum uncorrected net water cut
2 1647 1648 M i ni mum water cut
2 1657 1658 G ro ss volume total
2 1659 1660 M ass total
2 1661 1662 N et oi l volume total
2 1663 1664 Net water volume total
2 1665 1666 U ncorrected oil volume total
2 1675 1676 Density of oil at reference temperature
2 1677 1678 M aximum deviation of oil density during density determi nat i on
2 1679 1680 Density of water at reference tem p erat ure
2 1681 1682 M aximum deviation of water density during density determi nat i on
2 1683 1684 Drive gain threshold for TBR (volts)
2 1711 1712 Well test elapsed time
2 1713 1714 Well test pau sed time
2 1715 1716 Well test purge time remaining
2 1725 1726 Ti m e and date of last production me asurement reset
2 1727 1728 Ti m e and date last well test was stopped
2 1729 1730 Ti m e and date last well test was started
2 1741 1742 Ti m e and date maximum back flow was achieved
2 1743 1744 Ti m e and date maximum density was ach ieved
2 1745 1746 Ti m e and date maximum drive gain was achieved
2 1747 1748 Time and date maximum gross flow rate was achieved
2 1749 1750 Ti m e and date maximum mass flow rate was ach ieved
2 1751 1752 Ti m e and date maximum net oil flow rate was achieved
2 1753 1754 Time and date maximum net water flow rate was achieved
2 1755 1756 Ti m e and date maximum temperatur e was ac hi eved
2 1757 1758 Ti m e and date maximum uncorr ect ed net oil flow rate was achieved
2 1759 1760 Ti m e and date maximum uncorr ect ed water cut was achieved
2 1761 1762 Ti m e and date maximum water cut was achieved
2 1771 1772 Ti m e and date minimum back flow was achieved
2 1773 1774 Ti m e and date minimum density was achi eved
2 1775 1776 Ti m e and date minimum drive gain was achieved
2 1777 1778 Ti m e and date minimum gross flow rate was achieved
2 1779 1780 Ti m e and date minimum mass flow rate was achieved
2 1781 1782 Ti m e and date minimum net oil flow rate was achieved
2 1783 1784 Time and date minimu m net water f l ow rate was achi eved
2 1785 1786 Ti m e and date minimum temperatur e was achieved
2 1787 1788 Time and date minimu m uncorrected net oil flow rate was ach ieved
2 1789 1790 Time and date minimu m uncorrected water cut was achieved
2 1791 1792 Time and date minimu m water cut was achieved
Using Modbus Protocol with the ALTUS Net Oil Computer
31
Modbus Mapping Assignments
continued
Floating point register pairs (continued)
Address Description
2 1801 1802 Ti m e and date back flow was reset
2 1803 1804 Ti m e and date density was reset
2 1805 1806 Ti m e and date drive gain was reset
2 1807 1808 Ti m e and date gross flow rate was reset
2 1809 1810 Time and date mass fl ow rate was reset
2 1811 1812 Time and date net oil flow rate was reset
2 1813 1814 Time and date net water flow rate was reset
2 1815 1816 Ti m e and date temperature was reset
2 1817 1818 Ti m e and date uncorrected net oil flow rate was res et
2 1819 1820 Ti m e and date uncorrected water cut was reset
2 1821 1822 Ti m e and date water cut was reset
2 1831 1832 C ontainer for density used in density determination calculat io ns
2 1833 1834 C ontainer for temperature used in density determination calcul ati ons
2 1835 1836 Container for w ater cut percentage used in densi ty determinatio n calculations
2 1839 1840 R esults from calculated water dens ity operation
2 1843 1844 R esults from last water density determination meas urement
2 1847 1848 Current water density at r eference
2 1851 1852 Current oil density at reference
2 1855 1856 R esults from calculation of oil density at reference
2 1859 1860 D ensity determina tion volume total
32
Using Modbus Protoco l wit h th e AL TU S Net O il Co m put er
Modbus Mapping Assignments
continued
Input registers
Address Description
3 0001 Bit #0 (E)EPROM checksum failure
Bit #1 Undefined
Bit #2 Sensor failure
Bit #3 Temperature sensor failure
Bit #4 Input overrange
Bit #5 Frequency/pulse output saturated
Bit #6 Transm i tte r not configured
Bit #7 Real-time interrupt failure
Bit #8 Milliamp output(s) saturated
Bit #9 Milliamp output(s) fixed
Bit #10 Density overrange
Bit #11 Calibrati on failure
Bit #12 Transmitter electronics failure
Bit #13 Slug flow
Bit #14 Transmitter initializing/warming up
Bit #15 Power reset occurred
3 0002 M ass flow rate scaled integer
3 0003 Density scaled integer
3 0004 Temperature scaled integer
3 0005 Volume flow rate scaled integer
3 0008 Mass total scaled integer
3 0009 Volume total scaled integer
3 0010 M as s inventor y scaled integer
3 0011 Volume inventory scaled integer
3 0125 Bi t #0 Primary mA output saturated
Bit #1 Secondary mA output saturated
Bit #2 Primary mA output fixed
Bit #3 Secondary mA output fixed
Bit #4 Density overrange
Bit #5 Drive gain overrange
Bit #6 Undefined
Bit #7 Undefined
Bit #8 (E)EPROM checksum failure
Bit #9 RAM diagnostic failure
Bit #10 Sensor failure
Bit #11 Temperature sensor failure
Bit #12 Input overrange
Bit #13 Frequency/pul se output saturated
Bit #14 Transmitter not configured
Bit #15 Real-time interrupt failure
Using Modbus Protocol with the ALTUS Net Oil Computer
33
Modbus Mapping Assignments
continued
Input registers (continued)
Address Description
3 0126 Bit #0 Undefined
Bit #1 Power reset occurred
Bit #2 Undefined
Bit #3 Undefined
Bit #4 Undefined
Bit #5 Undefined
Bit #6 Undefined
Bit #7 Undefined
Bit #8 Calibration failure
Bit #9 Zero value too low
Bit #10 Zero value too high
Bit #11 Undefined
Bit #12 Transmitter electronics failure
Bit #13 Undefined
Bit #14 Flowmeter zeroing in progress
Bit #15 Slug flow
3 0419 Bit #0 (E)EPROM checksum erro r
Bit #1 RAM test error
Bit #2 Real-time interrupt failure
Bit #3 Sensor not responding
Bit #4 Temperature sensor out of range
Bit #5 Calibration failure
Bit #6 Undefined
Bit #7 Transmitter initializing/warming up
Bit #8 Undefined
Bit #9 Undefined
Bit #10 Undefined
Bit #11 Undefined
Bit #12 Undefined
Bit #13 Undefined
Bit #14 Undefined
Bit #15 Undefined
34
Using Modbus Protoco l wit h th e AL TU S Net O il Co m put er
Modbus Mapping Assignments
continued
Input registers (continued)
Address Description
3 0420 Bi t #0 Primary mA output saturated
Bit #1 Secondary mA output saturated
Bit #2 Primary mA output fixed
Bit #3 Secondary mA output fixed
Bit #4 Density overrange
Bit #5 Drive overrrange
Bit #6 Undefined
Bit #7 Undefined
Bit #8 (E)EPROM checksum failure
Bit #9 RAM diagnostic failure
Bit #10 Senso r not responding
Bit #11 Temperature sensor failure
Bit #12 Input overrange
Bit #13 Frequency/pul se output saturated
Bit #14 Transmitter not configured
Bit #15 Real-time interrupt failure
3 0421 Bit #0 Undefined
Bit #1 Power reset occurred
Bit #2 Transmitter initializing/warming up
Bit #3 Undefined
Bit #4 Undefined
Bit #5 Undefined
Bit #6 Undefined
Bit #7 Undefined
Bit #8 Calibration failure
Bit #9 Zero value too low
Bit #10 Zero value too high
Bit #11 Undefined
Bit #12 Transmitter electronics failure
Bit #13 Undefined
Bit #14 Calibrati on i n pr ogress
Bit #15 Slug flow
Using Modbus Protocol with the ALTUS Net Oil Computer
35
Modbus Mapping Assignments
continued
Input registers (continued)
Address Description
3 0423 Bit #0 Undefined
Bit #1 Undefined
Bit #2 Frequency output fixed
Bit #3 Undefined
Bit #4 Undefined
Bit #5 Undefined
Bit #6 Undefined
Bit #7 Undefined
Bit #8 Undefined
Bit #9 Undefined
Bit #10 Undefined
Bit #11 Undefined
Bit #12 Undefined
Bit #13 Undefined
Bit #14 Undefined
Bit #15 Undefined
3 1837 Timecode when de nsity determina ti on perfo rmed (hi gh order register of 4-byte integer)
3 1838 Ti m ec ode when density determination performed (low order register of 4-byte integer)
3 1841 T imecode for last calculated water den si ty operation (high order regist er of 4-byte integer)
3 1842 T imecode for last calculated water den si ty operation (low order register of 4- byte in te ger )
3 1845 T imecode for last water density determination mea sur em ent (high order regist er of 4 -byte int eger)
3 1846 T imecode for last water density determination mea sur em ent (low order register of 4-byte integer)
3 1849 T imecode for current water density at re f. (high or der register of 4-byte integer)
3 1850 Timecode for current water density at ref. (low order register of 4-byte integer)
3 1853 Timecode for current oil density at ref. (high order register of 4-byte integer)
3 1854 T imecode for current oil density at re f. (low order re gi st er of 4-byte int eger)
3 1857 Timecode for last calculation of oil density at ref. (high order register of 4-byte integer)
3 1858 Timecode for last calculation of oil density at ref. (low order register of 4-byte integer)
36
Using Modbus Protoco l wit h th e AL TU S Net O il Co m put er
Modbus Mapping Assignments
continued
Holding registers
Address Description
4 0012 Primary milliamp output variable
4 0013 Secondary milliamp output variable
4 0014 Frequ e ncy/pulse outp ut variabl e
4 0016 Transmitter software revision
4 0017 F low di re ct i on (forward/backward)
4 0018 M ax imum in te ger
4 0019 Mass flow offset
4 0020 Density offset
4 0021 Temperature off set
4 0022 Volume flow offset
4 0024 Pr essure offset
4 0025 Mass total offset
4 0026 Volume total offset
4 0027 M as s inventor y offset
4 0028 Volume inventory offset
4 0029 M as s flow s cale factor
4 0030 D ensity scale factor
4 0031 Temperature scale factor
4 0032 Volume flow scale factor
4 0034 Pr essure scale factor
4 0035 Mass total scale factor
4 0036 Volume total scale factor
4 0037 M as s inventor y scale factor
4 0038 Volume inventory scale factor
4 0039 Mass flow rate unit
4 0040 Density unit
4 0041 Temperature unit
4 0042 Volume flow rate unit
4 0045 M as s to ta l or mass inventory unit
4 0046 Volume total or volume inventory unit
4 0120 Device type co de
4 0121 Manufacturer ID
4 0129 S ensor flange type
4 0130 Sensor flow tube construction material
4 0131 Sensor flow tube liner material
Using Modbus Protocol with the ALTUS Net Oil Computer
37
Modbus Mapping Assignments
continued
Holding registers (continued)
Address Description
4 0136 Maximum zeroing time
4 0312 Undefined
4 0313 M od bus slave address
4 0521 Floating point byte order
4 1107 Frequency/pulse output fault code
4 1108 Frequency/pulse output scaling method
4 1113 Primary milliamp output fault code
4 1114 Secondary millia m p output fault code
4 1150 C oriolis and sensor al arm timeout (mi nu t es)
4 1151 Discrete output 1 variable
4 1152 Di scr et e output 1 power source
4 1139 Undefined
4 1691 Time duration which oil density will be averaged during density determination (seconds)
4 1692 Time duration which produced water density will be averaged during density determination (seconds)
4 1693 P ur ge time for the NOC to allow the separato r contents of the previous test to purge (minutes)
4 1694 Look-back time inter val for TBR (5–30 seconds)
4 1701 Well to be configured (1–48)
4 1702 Well that is being tested (1–48)
4 1703 Te st results (0 = well currently under test, 1 = last test, 2 = next-to-last test, 3 = oldest test)
4 1704 Well within archive for test results (1–48)
4 1705 Referenc e Temperature (60 °F, 15 °C, 20 °C)
4 1706 Act i on to be ta ken on TBR event (0 = hold last value, 1 = stop well test, 2 = alarm only)
4 2305 Index of well name to configure (1–48)
38
Using Modbus Protoco l wit h th e AL TU S Net O il Co m put er
Modbus Mapping Assignments
continued
ASCII character strings
Address Description
Note
Always write character string as single-write multiple.
5
5
5
5
5
5
5
5
2306
2307
2308
2309
2310
2311
2312
2313
1st two characters of well name
2nd two characters of well name
3rd two characters of well nam e
4th two characters of well name
5th two characters of well name
6th two characters of well name
7th two characters of well name
8th two characters of well name
—Single-write multiple
Using Modbus Protocol with the ALTUS Net Oil Computer
39
Modbus Mapping Assignments
continued
Integer codes
Mass flow unit codes (hold in g register 40039)
70 Grams/second
71 Grams/minute
72 Grams/hour
73 Kilograms/second
74 Kilograms/minute
75 Kilograms/hour
76 Kilograms/day
77 Metric tons/minute
78 Metric tons/hour
79 Metric tons/day
80 Pounds/second
81 Pounds/minute
82 Pounds/hour
83 Pounds/day
84 Short tons (2000 pounds)/minute
85 Shor t tons (2000 pounds)/ho ur
86 Shor t tons (2000 pounds)/day
87 Long tons (2240 pounds)/hour
88 Long tons (2240 pounds)/day
Mass totalizer or mass inventory unit codes (holding re gi st er 40045)
60 Grams
61 Kilograms
62 Metric tons
63 Pounds
64 Shor t tons (2000 pounds)
65 Long tons (2240 pounds)
40
Using Modbus Protoco l wit h th e AL TU S Net O il Co m put er
Modbus Mapping Assignments
continued
Integer codes (continued)
Vo lu m e flow unit codes (h oldin g re gist er 4004 2)
15 Cubic feet/minute
16 U.S. gallons/minute
17 Liters/minute
18 Imperial gallons/minute
19 Cubic meters/hou r
22 U.S. gallons/second
23 Million U.S. gallons/day
24 Liters/second
26 Cubic feet/second
27 Cubic feet/day
28 Cubic meters/sec on d
29 Cubic meters/day
30 Imperial gallons/hour
31 Imperial gallons/day
130 Cubic feet/hour
131 Cubic meter s/m inute
132 Barrels/second
133 Barrels/minute
134 Barrels/hour
135 Barrels/day
136 U.S. gallons/hour
137 Imperial gall ons/second
138 Liters/hour
235 U.S. gallons/day
Vo lum e to talizer or volume inventory unit codes (holding register 40046)
40 U.S. gallons
41 Liters
42 Imperial gallons
43 Cubic meters
46 Barrels (42 U.S. gallons)
112 Cubic feet
Using Modbus Protocol with the ALTUS Net Oil Computer
41
Modbus Mapping Assignments
continued
Integer codes (continued)
Temperature unit codes (holding register 40041)
32 Degrees Celsius
33 Degrees Fahrenheit
34 Degrees Rankine
35 Degrees Kelvin
Density unit codes (holding register 40040)
91 Grams/cubic centim et er
92 Kilograms/cubic meter
93 Pounds/gallon
94 Pounds/cubic foot
96 Kilograms/liter
97 Grams/liter
98 Pounds/cubic inch
99 Shor t tons (2000 pounds)/cu bi c yard
Discrete output 1 power so urce code s (holding register 4115 2)
0 External
1 Int ernal
Discrete output 1 outpu t variable codes (holding register 41151)
251 None
54 Discrete input 1
55 Discrete input 2
97 Transient bubble remediation
72 Fault alarm
Milliamp ouput variable codes (holding register 40012 or 40013)
0 Mass flow rate
1 Temperature
3Density
5 Volume flow rate
70 Drive gain
73 Actual uncorrec t ed oi l flow
74 Actual uncorrec t ed water cut
75 Actual uncorrec t ed water flow
76 Actual uncorrec t ed gross flow
77 Actual uncorrec t ed back flow
78 Net oil flow
79 Water cut
80 Gross flow
81 Net water flow
82 Average uncorrected oil flow
83 Average uncorrected water cut
84 Average uncorrected gross flow
85 Average uncorrected water flow
86 Average back flow
87 Average net oil flow
88 Average water cut
89 Average gross flow
90 Average net water flow
42
Using Modbus Protoco l wit h th e AL TU S Net O il Co m put er
Modbus Mapping Assignments
continued
Integer codes (continued)
Flow direction codes (holding register 40017)
0 Forward flow on ly
1 Backward flow only
Frequency/pulse output variable codes (holding register 40014)
0 Mass flow rate
5 Volume flow rate
57 Frequency Input
73 Actual uncorrec t ed oi l flow
75 Actual uncorrec t ed water flow
77 Actual uncorrec t ed back flow
78 Net oil flow
80 Gross flow
81 Net water flow
Frequency/pulse output scaling method codes (holding regist er 41108)
0 Frequency=flow
1 Pul ses/unit
2 Units/pulse
Sensor flange type codes (holding register 40129)
0ANSI 150
1ANSI 300
2ANSI 600
5PN 40
7 JIS 10K
8 JIS 20K
9ANSI 900
10 Sanitary cl am p
11 Union
12 PN 100
250 Reserved
251 None
252 Unknown
253 Special
254 Reserved
255 Reserved
Flow tube construction material codes (holding regi st er 40130)
3Hastelloy
4 Monel
5Tantalum
6 Titanium
19 316L stainless steel
23 Inconel
252 Unknown
253 Special
®
C-22
®
®
Using Modbus Protocol with the ALTUS Net Oil Computer
43
Modbus Mapping Assignments
continued
Integer codes (continued)
Flow tube liner material codes (holding register 40131)
16 Tefzel
251 None/other
Fault output codes (holding register 40007 or 40013)
0Upscale
1 D ownscale
2 Last measured value
3 Int ernal zero
Reference temperature index table (register 417 05):
060 °F
115 °C
220 °C
TBR event action ta ble (r egister 41706):
0 Hol d l ast value
1 Stop well test
2 Alarm only
®
Timecode reference
All timecodes are in second s referenced to 01 January 1998.
44
Using Modbus Protoco l wit h th e AL TU S Net O il Co m put er
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