Sierra 241-VTP, 240-VTP instruction manual Register Definitions

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Series 24-HP Instruction Manual

Appendix E MODBUS Commands

there is an informal register numbering convention derived from the original (now obsolete) Modicon Modbus protocol specification, and used by many vendors of Modbus capable products.

Registers

Usage

Valid Function Codes

 

 

 

 

00001–09999

Read/write bits ("coils")

01

(read coils) 05 (write single coil)

 

 

15

(write multiple coils)

 

 

 

 

10001–19999

Read-only bits ("discrete inputs")

02

(read discrete inputs)

30001–39999

Read-only 16 bit registers ("input regis-

03

(read holding registers) 04 (read

 

ters"), IEEE 754 floating point register

input registers)

 

pairs, arbitrary length strings encoded as

 

 

 

two ASCII characters per 16-bit register

 

 

 

 

 

 

40001–49999

Read/write 16-bit registers ("holding regis-

03

(read holding registers) 06 (write

 

ters"), IEEE 754 floating point register

single register) 16 (write multiple

 

pairs, arbitrary length strings encoded as

registers)

 

two ASCII characters per 16-bit register

 

 

 

 

 

 

Each range of register numbers maps to a unique range of ad- dresses that are determined by the function code and the register number. The address is equal to the least significant four digits of the register number minus one, as shown in the following table.

Registers

Function Codes

Data Type and Address Range

 

 

 

00001-09999

01, 05, 15

Read/write bits 0000-9998

 

 

 

10001-19999

02

Read-only bits 0000-9999

 

 

 

30001-39999

03, 04

Read-only 16-bit registers 0000-9998

40001-49999

03, 06, 16

Read/write 16-bit registers 0000-9998

 

 

 

Register Definitions

The meter serial number and those variables that are commonly monitored (mass, volume and energy flow rates, total, pressure, temperature, density, viscosity, Reynolds number, and diagnostic variables such as frequency, velocity, gain, amplitude and filter set- ting) are accessible via the Modbus protocol. Long integer and floating point numbers are accessed as pairs of 16-bit registers in the register order selected in the Modbus Order menu. Floating point numbers are formatted as single precision IEEE 754 floating point values.

The flow rate, temperature, pressure, and density variables may be accessed as either the flow meter internal base units or in the user-programmed display units, which is determined by the pro-

IM-24-HP

E-3

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Contents Models 240-VT, 240-VTP, 241-VT, 241-VTP Copyright Sierra Instruments Customer NoticeTable of Contents Troubleshooting and Repair Tables FiguresTable of Contents Introduction Using This ManualInnova-MassMulti-Parameter Vortex Mass Flow Meters Technical Assistance Receipt of System ComponentsVelocity Measurement How the Innova-Mass Vortex Mass Flow Meter OperatesVortex Frequency Sensing Vortex Shedding FrequencyGas Liquid Flow Velocity RangeReynolds Number Range for the Innova-Mass Temperature MeasurementPressure Measurement Flow Meter ConfigurationsFlow Meter Electronics Installation Overview InstallationFlow Meter Installation Requirements Unobstructed Flow Requirements Flange Bolt Specifications Series 240 In-Line Flow Meter InstallationWafer-Style Flow Meter Installation Wafer-Style Flow Meter InstallationFlange-Style Flow Meter Installation Flange-Style Flow Meter InstallationMounting Position Series 241 Insertion Flow Meter InstallationIsolation Valve Selection Cold Tap Guidelines Flow Hot Tap GuidelinesUse the Correct Insertion Formula Flow Meter InsertionExample Installing Flow Meters with a Compression ConnectionInsertion Procedure for Meters with a Compression Connection Example 1 Flange Style Meters Installing Flow Meters with a Packing Gland ConnectionExample 2 NPT Style Meters Flow Meter with Permanent Insertion Tool 10. Flow Meter with Removable Insertion Tool 11. Insertion Calculation Meters without Insertion Tool Installation Display/Keypad Adjustment All Meters Adjusting Meter Orientation13. Enclosure Viewing Adjustment Enclosure Adjustment Series 240 OnlyInput Power Connections Wiring ConnectionsAC Power Wiring DC Power Wiring16. Load Resistance Versus Input Voltage MA Output ConnectionsPulse Output Connections 20. Isolated Pulse Output with External Power Supply 23. Isolated Alarm Output with External Power Supply Alarm Output Connections25. Isolated Alarm Output Using Meter Provided Power Supply Remote Electronics WiringOptional Energy EMS Input Electronics Wiring Optional Input Electronics WiringPage Flow Meter Display/Keypad Operating InstructionsSierra Start-Up Run Mode ScreensProgramming the Flow Meter Using the Setup MenusTimeConstSec Xxxx Output MenuFirst, set the desired units of measurement Example for Setting an OutputDisplay Menu Example for Changing a Run Mode Display ItemExample for Setting an Alarm Alarms MenuTotalizer #1 Menu Example for Setting the TotalizerTotalizer #2 Menu Energy Menu For EMS Energy Meters Only ConfigurationFluid Menu Units Menu Time & Date Menu Example for Setting the TimeDiagnostics Menu Calibration Menu Password Menu Hidden Diagnostics Menus Troubleshooting and RepairColumn One Hidden Diagnostics Values IM-24-HP A2D Ref. Resistor = Factory Use Only Analog Output Calibration Troubleshooting the Flow Meter Symptom Output at no Flow Symptom No Output Symptom Meter Displays Temperature Fault Electronics Assembly Replacement All Meters Pressure Sensor Replacement Appendix a Product Specifications Appendix a Specifications Appendix a Specifications Cnpt IP66, Nema Page C D Appendix B GlossaryK L S T Page Calculations for Steam T & P Appendix C Fluid CalculationsDensity ViscosityDensity for real gases is calculated from the equation Calculations for Gas Real Gas and Other GasCalculations for Liquid Page PV AO Appendix D Hart Commands with DD MenuPV AO PV LRV URV Appendix D Hart Commands without DD MenuApplicable Flow Meter Models Appendix E Modbus CommunicationModbus Order Register Definitions Appendix E Modbus Commands Following registers contain the display units strings Control Register Definitions Examples An attempt to read registers that don’t exist 8C 3A CRC not the correct CRC EJS-02-06-07 Appendix E Modbus Commands