Fieldbuses A-1
AC30 series Variable Speed Inverter
Chapter A: Fieldbuses
Modbus TCP
Introduction
The inverters built-in Ethernet includes a Modbus TCP server. The Modbus registers are mapped to the inverters parameters. Up to 3
simultaneous connections to Modbus clients are possible. TCP port 502 is used.
Making a connection to the Ethernet and setting an IP address on the inverter is described in Chapter 12 (Ethernet). If the Modbus TCP is used
as part of a process control it is recommended a dedicated network be used with fixed IP addresses for the inverter.
To allow Modbus TCP connections to the inverter, the parameter 0939 Maximum Connections must be set to a value greater than zero.
Modbus Register Mapping Summary
The inverter parameters are mapped to the Holding Registers and Input Registers, either as a fixed mapping or as a user-defined mapping.
There is no mapping to Coils or Discrete Inputs.
Holding Register Address Input Register Address Description
00001 - 00256 00001 - 00256 User-defined mapping to the inverter parameter values.
00257 - 00528 00257 - 00528 Reserved area.
Do not write into this register range.
00529 - onwards 00529 - onwards Fixed mapping to the inverter parameter values.
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