ABB A43

Communication with Modbus
A43/A44 98 2CMC48001M0201
User Manual Revision: C
9 Communication with Modbus
Overview
This chapter describes the mapping from meter data to Modbus and how to read
and write to registers. The chapter contains information for all functionality and
data for the complete A series family. For single phase meters some data does not
exist, for example data for phase 2 and 3.
In this chapter The following topics are covered in this chapter:
9 Communication with Modbus................................................................................................ 98
9.1 Bus Description ........................................................................................................................ 99
9.2 About the Modbus Protocol ................................................................................................... 100
9.2.1 Function Code 3 (Read holding registers) ...................................................................... 100
9.2.2 Function Code 16 (Write multiple registers) .................................................................. 103
9.2.3 Function Code 6 (Write single register) ......................................................................... 104
9.2.3.1 Exception Responses .............................................................................................. 105
9.3 Reading and Writing to Registers ........................................................................................... 106
9.4 Mapping Tables ...................................................................................................................... 108
9.5 Historical Data ........................................................................................................................ 119
9.5.1 Quantity identifiers ........................................................................................................ 122
9.6 Previous Values ...................................................................................................................... 127
9.6.1 Reading Previous Values ................................................................................................ 129
9.7 Demand .................................................................................................................................. 132
9.7.1 Reading Demand ............................................................................................................ 134
9.8 Event logs ............................................................................................................................... 136
9.8.1 Reading Event logs ......................................................................................................... 139
9.9 Load profile ............................................................................................................................ 140
9.9.1 Reading Load profile ...................................................................................................... 142
9.10 Configuration ......................................................................................................................... 143
9.10.1 Previous values ............................................................................................................... 143
9.10.2 Demand .......................................................................................................................... 144
9.10.3 Load profile .................................................................................................................... 148
9.10.4 Alarms ............................................................................................................................ 149
9.10.5 Inputs and outputs ......................................................................................................... 153
9.10.6 Tariffs ............................................................................................................................. 156
9.10.7 Daylight Savings Time ..................................................................................................... 165
9.11 Communication examples ...................................................................................................... 168
9.11.1 Reading energy values ................................................................................................... 168
9.11.2 Reading Instrumentation values .................................................................................... 169
9.11.3 Writing parameters ........................................................................................................ 170