Cameron LEFM 200 Manuale utente
Manual No. IB0147 Rev. 08
CALDON®ULTRASONICS
LEFM®200 Modbus
User Manual
Modbus Register
Addresses and Parameters
LEFM200 Series and SoundTrack
IB0147 Rev. 08 LEFM 200 Modbus User Manual
Cameron's Measurement Systems division is a manufacturer of high quality instrumentation and
control products, selling direct from a Pittsburgh based factory to customers in the U.S. and
through agents and representatives overseas. A complete range of support services is offered. For
additional information or assistance on the application, operation or servicing of the LEFM 200
Modbus, write, call, or visit www.c-a-m.com.
Before performing maintenance procedures, system verification procedures, repair procedures,
and troubleshooting procedures, personnel should receive general training from Cameron.
Contact Cameron’s Measurement Systems division for information on training programs.
Caldon is a trademark of Cameron International Corporation (“Cameron”).
LEFM is a registered trademark of Cameron.
Modbus is a registered trademark of Modbus Organization, Inc.
Copyright © 2010 Cameron International Corporation (“Cameron”). All information
contained in this publication is confidential and proprietary property of Cameron. Any
reproduction or use of these instructions, drawings, or photographs without the express
written permission of an officer of Cameron is forbidden.
All Rights Reserved
Printed in the United States of America
Manual No. IB0147, Rev. 08
December 2010
LEFM 200 Modbus User Manual IB0147 Rev. 08
December 2010 Page i Table of Contents
TABLE OF CONTENTS
1.0 PURPOSE..................................................................................................................................1
1.1 Related Documents.....................................................................................................................1
1.2 Intended Audience......................................................................................................................1
1.3 Procedure ....................................................................................................................................1
2.0 HOLDING REGISTERS - LEFM 240C(I), LEFM 220C(I), LEFM280C(I), AND
SOUNDTRACK....................................................................................................................................3
2.1 Registers to Save the Setup.........................................................................................................3
2.2 Registers for Scaling Flow, Flow Units and Pulse Output .........................................................3
2.3 Reference Temperature and Pressure for Gross to Net Conversions and Fail State References5
2.4 Display Output Screen Format Definitions.................................................................................5
2.5 Modbus Protocol Setups.............................................................................................................6
2.6 Calculated Viscosity Setups........................................................................................................7
2.7 Calculated Density Setups ..........................................................................................................8
2.8 Password Entry ...........................................................................................................................9
2.9 Analog Inputs............................................................................................................................10
2.10 Analog Outputs.....................................................................................................................13
2.11 Display Notes........................................................................................................................16
2.12 Meter Data Summary Registers (For 101A639 Rev 07.xx.xx and later)..............................16
3.0 LEFM 210E (SINGLE PATH EXTERNAL FLOW METERS)........................................19
3.1 Registers to Save the Setup.......................................................................................................19
3.2 Registers for Scaling Flow, Flow Units and Pulse Output .......................................................19
3.3 Display Output Screen Format Definitions...............................................................................20
3.4 Modbus Protocol Setups...........................................................................................................21
3.5 Analog Inputs............................................................................................................................21
3.6 Analog Outputs.........................................................................................................................22
3.7 Display Notes............................................................................................................................23
4.0 DATA OUTPUTS – INPUT REGISTERS...........................................................................25
4.1 Path Transit and Delta Time Measurements.............................................................................25
4.2 Acoustic Data Quality...............................................................................................................26
4.3 Flow Data..................................................................................................................................29
4.4 Analog Input Values.................................................................................................................29
4.5 Setup File Information..............................................................................................................30
4.6 Fluid Property Data...................................................................................................................31
4.7 Hydraulic and Velocity Data ....................................................................................................32
4.8 Meter and Path Status Data.......................................................................................................33
4.9 Transducer Impedance Test Data..............................................................................................34
5.0 EXAMPLES ............................................................................................................................37
5.1 Polling Integer Input Registers .................................................................................................37
5.2 Polling Floating Point Registers ...............................................................................................39
IB0147 Rev. 08 LEFM 200 Modbus User Manual
Table of Contents Page ii December 2010
LEFM 200 Modbus User Manual IB0147 Rev. 8
December 2010 Page 1 Section 1
1.0 PURPOSE
This manual documents the parameters and Modbus addresses necessary for typical maintenance
of the LEFM 200 transmitter. It includes the addresses and locations of typical setup
configuration values and output data. It also defines the formats and ranges for these values.
This manual is for use with interfacing the LEFM 200 transmitter with other systems. If a user
interface is all that is required, then use the LEFMLink interface program available from
Cameron.
The parameters defined include the following:
•Flow scaling and counts factor
•Analog interface parameters
•Modbus and display interface parameters
The transmitter will accept any value in a given field (provided it is the expected format and
address, for example floating point or integer and not character). However, there are values that
produce illogical inputs. Therefore, this document defines and recommends ranges for all inputs
based on engineering analysis.
1.1 Related Documents
The LEFM 200 and SoundTrack transmitters use the Modbus protocol for serial communication:
Modicon Modbus Protocol Reference Guide (PI-MBUS-300 Rev. C) dated January 1991.
The following documents may also be useful:
Cameron LEFM280C, LEFM 240C and 220C Installation and Operation Manuals
SoundTrack Installation and Operation Manual
Cameron LEFM 210E Installation and Operation Manual
1.2 Intended Audience
The LEFM 200 flowmeters and SoundTrack Interface detectors can be customized following the
information provided in this manual. This manual is intended to be used by plant site operators,
site engineers, and supervisory personnel. This manual assumes the reader is familiar with the
terminology typically used with Modbus.
1.3 Procedure
Note: Always read a register’s value first in order to confirm its current value before it is
changed.
1. Identify the Holding Register to be changed.
2. Read the contents of the Holding Register to confirm its as-found value.
IB0147 Rev. 08 LEFM 200 Modbus User Manual
Section 1 Page 2 December 2010
3. Send Password to Register 2000. (The password expires after ~5 minutes.) The password is
typically controlled by the site manager. If the password cannot be determined, contact
Cameron’s Measurement System division to determine the as-shipped password.
4. Change the register using Modbus protocol.
5. Activate the Burn and Use Register.
The transmitter will not start using any of its new fields until the Holding Register Burn and
Use (address 170) is activated. When this register is activated (by putting a 1 into the field),
all the registers are burned into the transmitter’s memory and the device will restart using the
latest registers. This must be completed before the password expires!
LEFM 200 Modbus User Manual IB0147 Rev. 8
December 2010 Page 3 Section 2
2.0 Holding Registers - LEFM 240C(i), LEFM 220C(i),
LEFM280C(i), and SoundTrack
The following table defines the addresses for the software setup variables used by typical users.
*Other address locations not listed here were used by Cameron to customize each meter for its
manufactured dimensions.
Holding Registers are accessed from the 200 Series Electronics with Modbus Function Code 3.
Note: Integer values are limited to ±32767.
2.1 Registers to Save the Setup
Setup Variable Holding
Register Variable Definition Address* Notes
Command to use latest entries
BURN AND USE Integer 170 Activate new setup
values
Save Setup Lockout (Ci Only)
To place the transmitter in lockout mode put switches 1 -6 in the on position.
In Lockout mode – all write commands (FNC16, FNC6) to holding registers and special action
holding registers (burn and use) sent via Modbus are blocked. A Modbus error code indicating
an illegal address is returned in response. Read commands to holding and input registers (e.g.,
FNC3, FNC4) are still enabled.
2.2 Registers for Scaling Flow, Flow Units and Pulse Output
Setup Variable Holding
Register Variable
Definition Address* Notes
MINIMUM FLOW
CUTOFF Float 44 Flow rates below this value ( in
absolute value) are clamped to 0
(display and pulses) and the flow
meter’s totalizers do not update.
UNITS CONVERSION
(converts default cubic feet
to other units)
Float 52 Typically delivered in customer
requested units:
Typical Units:
0.178095238 converts to barrels
2.8317E-02 converts to cubic meters
IB0147 Rev. 08 LEFM 200 Modbus User Manual
Section 2 Page 4 December 2010
Setup Variable Holding
Register Variable
Definition Address* Notes
FLOW RATE TIME UNITS
(converts flow rates from per
second to other time units)
Float 54 Typically delivered in customer
requested units (standard is 3600 for
flow per hour other choices are 1 for
per second 60 for per minute)
NETORGROSS Integer 50 0 = GROSS FLOW, Rate & Total
1 = NET FLOW, Rate & Total
Net Reference Temperature Float 1114 Reference Temperature in
Temperature Units used to Calculate
Net Flow.
Use the units that the system was
delivered in (e.g., degF or degC)
Net Reference Pressure Float 1116 Reference Pressure in Pressure Units
used to Calculate Net Flow.
Use the units that the system was
delivered in. The units maybe one of
the following:
Kg/cm2,
PSIG,
bar,
kPa
Kfactor Float 98 See LEFM 240C/220C Installation,
Operation, and Maintenance manual
for table of pulses per unit volume.
When changing to a non-standard k-
factor the desired flow range must
produce an output between these
values:
Minimum Frequency = 3 Hz
Maximum Frequency = 10 kHz
Force a Frequency Output Integer 802 0 = Normal Operation
Any other value outputs a pulse
output at a frequency equal to the
value entered.
LEFM 200 Modbus User Manual IB0147 Rev. 8
December 2010 Page 5 Section 2
Setup Variable Holding
Register Variable
Definition Address* Notes
Totalizer Wrap-around Value Float 100 Absolute value at which totalizers
wraparound.
For example if this register = 1000.0,
then the totalizers would wrap around
back to 0 after 999.9.
2.3 Reference Temperature and Pressure for Gross to Net Conversions and
Fail State References
Setup Variable Holding
Register Variable
Definition Address* Notes
Use External
Temperature Integer 1118 0 = Use INPUT1 for Fluid Temp
1 = Use INPUT3 for Fluid Temp
Use External Density Integer 1119 0 = Use LEFM Calculated Density for
Gross to Net conversion
1 = Use INPUT4 for Density for Gross to
Net conversion
A/I Failure Default
Temperature Float 1120 Temperature used by meter if the
Temperature input fails
A/I Failure Default
Pressure Float 1122 Pressure used by meter if the Pressure
input fails
2.4 Display Output Screen Format Definitions
Setup Variable Holding Register Variable
Definition Address* Notes
FLOW FIELD WIDTH Integer 776 See Display Notes below
(page 16)
FLOW DECIMAL PRECISION Integer 777 See Display Notes below
(page 16)
DEGREES FIELD WIDTH Integer 778 See Display Notes below
(page 16)
DEGREES DECIMAL PRECISION Integer 779 See Display Notes below
(page 16)
TOTALIZER1 FIELD WIDTH Integer 780 See Display Notes below
(page 16)
IB0147 Rev. 08 LEFM 200 Modbus User Manual
Section 2 Page 6 December 2010
Setup Variable Holding Register Variable
Definition Address* Notes
TOTALIZER 1 DECIMAL
PRECISION Integer 781 See Display Notes below
(page 16)
TOTALIZER 2 FIELD WIDTH Integer 782 See Display Notes below
(page 16)
TOTALIZER 2 DECIMAL
PRECISION Integer 783 See Display Notes below
(page 16)
FLOWUNITS Integer 784 See Display Notes below
(page 16)
TOTUNITS Integer 785 See Display Notes below
(page 16)
2.5 Modbus Protocol Setups
Setup Variable
Holding Register Variable
Definition Address* Notes
Modbus Register
Update Period Integer 168 Period (in seconds) that Modbus registers
are updated.
240C/220C Note:
Value typically set to 5 seconds.
Values less than 4 may adversely
affect meter operation.
SoundTrack Note:
Value typically set to 1 second.
Modbus
Communications
Protocol
Integer 787 Communication Protocol Modbus RTU = 0
(Standard) Modbus ASCII = 1
Modbus Address Integer 788 Modbus address (default as delivered is
MODADDRESS = 1)
Modbus Baud Rate Unsigned
Integer 789 Allows different BAUD rates:
Choices
9600
19200
38400
It is noted, that if DIP Switch 2 is ENABLED on startup, the following occur:
Modbus address defaults to “1”
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