Communication With Modbus - ABB A43 User Manual

Communication with Modbus

9 Communication with Modbus

This chapter describes the mapping from meter data to Modbus and how to read
Overview
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
Reading Event logs ......................................................................................................... 139
9.8.1
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
A43/A44
User Manual
98 2CMC48001M0201
Revision: C