Krohne OPTISONIC V6 Modbus User Manual

2011-07-19 OPTISONIC_V6_Modbus_6.doc 1/29 KROHNE CT Products OPTISONIC V6 Modbus manual Protocol description & set-up Liab

2011-07-19 OPTISONIC_V6_Modbus_6.doc 10/29 KROHNE CT Products Registers 1-16 are addressed as 0-15. The value to be written is specified in the da

2011-07-19 OPTISONIC_V6_Modbus_6.doc 11/29 KROHNE CT Products Example An example of a request for slave device 17 to pre-set two registers startin

2011-07-19 OPTISONIC_V6_Modbus_6.doc 12/29 KROHNE CT Products 6 HANDLING OF LARGE DATA TYPES The standard Modbus specification does not explain h

2011-07-19 OPTISONIC_V6_Modbus_6.doc 13/29 KROHNE CT Products 6.2 Long integer (32 bit), Transmit Sequence Example Long integer value 305419896 (

2011-07-19 OPTISONIC_V6_Modbus_6.doc 14/29 KROHNE CT Products The IEEE 754 standard specifies a binary64 as having: • Sign bit: 1 bit • Exponent

2011-07-19 OPTISONIC_V6_Modbus_6.doc 15/29 KROHNE CT Products 7 DEFAULT SETTINGS By means of a number of parameters the Modbus communication link

2011-07-19 OPTISONIC_V6_Modbus_6.doc 16/29 KROHNE CT Products 8 MODBUS REGISTER MAPPING Registers are mapped to specific address ranges according

2011-07-19 OPTISONIC_V6_Modbus_6.doc 17/29 KROHNE CT Products 8.2 Holding Registers (read/write): Integer (16-bit); address range 3500-3999 Param

2011-07-19 OPTISONIC_V6_Modbus_6.doc 18/29 KROHNE CT Products Parameter / Variable (short description) Register Name Bit Bit Name Explanation Re

2011-07-19 OPTISONIC_V6_Modbus_6.doc 19/29 KROHNE CT Products Parameter / Variable (short description) Register Name Bit Bit Name Explanation Re

2011-07-19 OPTISONIC_V6_Modbus_6.doc 2/29 KROHNE CT Products TABLE OF CONTENTS 1 INTRODUCTION ...

2011-07-19 OPTISONIC_V6_Modbus_6.doc 20/29 KROHNE CT Products Parameter / Variable (short description) Register Name Bit Bit Name Explanation Re

2011-07-19 OPTISONIC_V6_Modbus_6.doc 21/29 KROHNE CT Products Parameter / Variable (short description) Name Explanation Relative address Absolute

2011-07-19 OPTISONIC_V6_Modbus_6.doc 22/29 KROHNE CT Products 8.7 Input Registers (read-only): Float (32-bit floating-point), address range 7000-

2011-07-19 OPTISONIC_V6_Modbus_6.doc 23/29 KROHNE CT Products Measured / entered process parameters Parameter / Variable (short description) Name

2011-07-19 OPTISONIC_V6_Modbus_6.doc 24/29 KROHNE CT Products Parameter / Variable (short description) Name Explanation Relative address Absolute

2011-07-19 OPTISONIC_V6_Modbus_6.doc 25/29 KROHNE CT Products Parameter / Variable (short description) Name Explanation Relative address Absolute

2011-07-19 OPTISONIC_V6_Modbus_6.doc 26/29 KROHNE CT Products Flowmeter configuration Parameter / Variable (short description) Name Explanation R

2011-07-19 OPTISONIC_V6_Modbus_6.doc 27/29 KROHNE CT Products Parameter / Variable (short description) Name Explanation Relative address Absolute

2011-07-19 OPTISONIC_V6_Modbus_6.doc 28/29 KROHNE CT Products Override control Parameter / Variable (short description) Name Explanation Relative

2011-07-19 OPTISONIC_V6_Modbus_6.doc 29/29 KROHNE CT Products 8.10 Holding Registers (read/write): Long long (64-bit integer), address range 8500

2011-07-19 OPTISONIC_V6_Modbus_6.doc 3/29 KROHNE CT Products 1 INTRODUCTION Scope This manual describes how to use the Modbus protocol with the O

2011-07-19 OPTISONIC_V6_Modbus_6.doc 4/29 KROHNE CT Products 2 PHYSICAL COMMUNICATION LAYER The Modbus over serial line protocol is a master-slav

2011-07-19 OPTISONIC_V6_Modbus_6.doc 5/29 KROHNE CT Products 3 SERIAL TRANSMISSION FORMAT Two transmission modes are defined for a Modbus data co

2011-07-19 OPTISONIC_V6_Modbus_6.doc 6/29 KROHNE CT Products 4 MODBUS MESSAGE FRAMING ASCII mode In ASCII mode a message starts with a colon char

2011-07-19 OPTISONIC_V6_Modbus_6.doc 7/29 KROHNE CT Products 4.4 Error Checking Methods Two error checking methods are defined for the Modbus pro

2011-07-19 OPTISONIC_V6_Modbus_6.doc 8/29 KROHNE CT Products 5 SUPPORTED FUNCTIONS A number of functions is available to perform operations on va

2011-07-19 OPTISONIC_V6_Modbus_6.doc 9/29 KROHNE CT Products 5.3 Function 03: READ HOLDING REGISTERS Function 03 reads the contents of 1 to 125 c