Download Technical Description - SMA Cluster Controller Modbus® Interface

SMA Solar Technology AG
Table of Contents
Table of Contents
1
2
3
Information on this Document ................................................................. 5
Safety .......................................................................................................... 8
2.1
2.2
2.3
2.4
Intended Use ...............................................................................................................8
Skills of Qualified Persons .........................................................................................8
Safety Precautions ......................................................................................................8
Information on Data Security ....................................................................................9
Product Description .................................................................................10
3.1
3.2
3.3
3.4
3.5
Modbus Protocol ..................................................................................................... 10
SMA Modbus Profile .............................................................................................. 10
User-Defined Modbus Profile ................................................................................. 10
PV System Topology................................................................................................ 10
Addressing and Data Transmission in the Modbus Protocol............................. 13
3.5.1
3.5.2
3.5.3
3.5.4
3.5.5
Unit IDs .................................................................................................................13
Assignment of the Modbus Register to Unit IDs .................................................13
Modbus Register Address, Register Width and Data Block .............................14
Address Range for Modbus Register..................................................................14
Data Transmission ................................................................................................14
3.7.1
3.7.2
3.7.3
3.7.4
SMA Data Types and NaN Values....................................................................16
16-Bit Integer Values ...........................................................................................16
32-Bit Integer Values ...........................................................................................16
64-Bit Integer Values ...........................................................................................17
3.6 Reading and Writing of Data ................................................................................ 15
3.7 SMA Data Types ..................................................................................................... 16
3.8 SMA Data Formats .................................................................................................. 17
4
Commissioning and Configuration .......................................................19
4.1 Commissioning Steps and Requirements .............................................................. 19
4.2 Information on Changing Unit IDs ........................................................................ 19
4.3 Changing Unit IDs via the Gateway..................................................................... 20
4.3.1
4.3.2
Reading out the Gateway ...................................................................................20
Changing a Unit ID in the Gateway ...................................................................21
4.4.1
Overview ..............................................................................................................22
4.4 Changing Unit IDs via the XML File usrplant.xml ................................................ 22
Technical Description
ClusterController_Modbus-TB-en-15
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