ECOLAB Versatronic Modbus Beschreibung Seite 102

Table of contents
Table of contents
1 General information................................................................................................. 5
1.1 Notes on the operating instructions.................................................................... 5
1.1.1 Call up operating instructions with smartphone / tablet................................... 6
1.1.2 Copyright......................................................................................................... 7
1.1.3 Article numbers / EBS-Article numbers........................................................... 7
1.1.4 Symbols, highlights and enumerations............................................................ 7
1.2 Warranty............................................................................................................. 9
1.3 Manufacturer's service and contact address...................................................... 9
2 Safety and security................................................................................................. 10
2.1 General safety advice....................................................................................... 10
2.2 Intended Use.................................................................................................... 10
2.2.1 Unauthorised modification and manufacture of spare parts.......................... 11
2.2.2 Explosion protection....................................................................................... 11
2.3 Life span........................................................................................................... 11
2.4 Safety measures taken by the operator............................................................ 11
2.5 Workforce requirements.................................................................................... 11
2.6 Personal protection equipment (PPE).............................................................. 12
2.7 Explanation of the safety symbols used........................................................... 12
2.7.1 Personal protective equipment - PPE............................................................ 12
2.7.2 Information on hazards.................................................................................. 13
2.7.3 Environmental protection measures.............................................................. 14
2.8 Installation, maintenance and repair work........................................................ 14
3 Modbus protocol description................................................................................ 16
3.1 Master-slave principle....................................................................................... 16
3.2 Transmission media for Modbus....................................................................... 17
3.3 Structure of a Modbus telegram....................................................................... 17
3.4 Function codes................................................................................................. 17
3.4.1 Reading n words............................................................................................ 18
3.4.2 Writing one word............................................................................................ 18
3.4.3 Writing n words.............................................................................................. 19
3.5 Data types......................................................................................................... 20
3.6 Examples of data transmission......................................................................... 21
3.6.1 Integer values................................................................................................ 21
3.6.2 Float values................................................................................................... 22
3.6.3 Character strings (texts)................................................................................ 23
3.7 Checksum (CRC16).......................................................................................... 24
3.8 Error messages................................................................................................ 25
3.8.1 Modbus error codes....................................................................................... 25
3.8.2 Error messages for invalid values.................................................................. 26
3.8.3 Error codes as integer feedback values........................................................ 27
4 Interfaces................................................................................................................. 31
4.1 Location of interfaces........................................................................................ 31
4.2 Interface assignment........................................................................................ 32
4.2.1 Terminating resistors...................................................................................... 33
5 Configuring interfaces........................................................................................... 34
417102397 Rev. 1-10.2019 2