KROHNE UFC 400 Modbus EN - Manual (Page 2)

CONTENTS
2 www.krohne.com 05/2013 - 4002744801 - AD Modbus UFC 400 R01 en
UFC 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......................................................................................................................... 14
5.8.3 Measurement values ............................................................................................................ 15
5.8.4 Measurement Status compliant with NAMUR NE 107 ......................................................... 15
5.8.5 Auxiliary Values..................................................................................................................... 16
5.8.6 Totaliser ................................................................................................................................ 17
5.8.7 Zero Calibration .................................................................................................................... 19
5.8.8 Process Input Parameters.................................................................................................... 20
5.8.9 Modbus RS485 Communication Settings ............................................................................. 21
5.8.10 NAMUR NE 107 Variable Event Group(s)............................................................................ 22
6 Application sequences 23
6.1 Saving and restoring the configuration setting ............................................................. 23
6.2 Zero Calibration.............................................................................................................. 24