KROHNE MFC 400 Modbus - Manual (Page 2)

CONTENTS
2 www.krohne.com 05/2013 - 4002525102 - AD Modbus MFC 400 R02 en
MFC 400
1 General information 4
1.1 Scope of the document..................................................................................................... 4
1.2 Scope of delivery............................................................................................................... 4
1.3 Modbus protocol interface ............................................................................................... 4
2 Technical data 5
2.1 General technical data ..................................................................................................... 5
2.2 Technical data of the Modbus interface (acc. to EIA/TIA standards) .............................. 5
3 Electrical connections 6
3.1 Modbus connection........................................................................................................... 6
3.2 Connection to Modbus bus ............................................................................................... 6
4 Establish RS485 connection 7
5 Modbus protocol 8
5.1 RTU frame format............................................................................................................. 8
5.2 Data representation ......................................................................................................... 9
5.2.1 8-bit values.............................................................................................................................. 9
5.2.2 16-bit values............................................................................................................................ 9
5.2.3 32-bit values............................................................................................................................ 9
5.2.4 64-bit values.......................................................................................................................... 10
5.3 Modbus Register Addresses .......................................................................................... 11
5.4 Supported Function Codes ............................................................................................. 11
5.5 Error messages .............................................................................................................. 11
5.6 Device identification ....................................................................................................... 12
5.7 Diagnostics ..................................................................................................................... 13
5.8 Parameters..................................................................................................................... 13
5.8.1 Device Control....................................................................................................................... 14
5.8.2 Device Status......................................................................................................................... 15
5.8.3 Measurement values ............................................................................................................ 16
5.8.4 Measurement Status compliant with NAMUR NE 107 ......................................................... 16
5.8.5 Auxiliary Values..................................................................................................................... 17
5.8.6 Totaliser ................................................................................................................................ 17
5.8.7 Zero Calibration .................................................................................................................... 20
5.8.8 Density Calibration Coefficients ........................................................................................... 21
5.8.9 Density Configuration ........................................................................................................... 21
5.8.10 Filters .................................................................................................................................. 22
5.8.11 System Control.................................................................................................................... 22
5.8.12 Calibration Coefficients ...................................................................................................... 23
5.8.13 Modbus RS485 Communication Settings ........................................................................... 24
5.8.14 NAMUR NE 107 Variable Event Group(s)............................................................................ 25
5.8.15 Concentration 1................................................................................................................... 26
5.8.16 Concentration 2................................................................................................................... 27