A-1
Modbus TCP
AC30V series Variable Speed Drive
Appendix A:
Modbus TCP
Introduction
The AC30V built-in Ethernet includes a Modbus TCP server. The Modbus registers are mapped to the AC30V 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 AC30V 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 AC30V drives.
To allow Modbus TCP connections to the AC30V, the parameter
0939 Maximum Connections
must be set to a value greater than zero.
MODBUS REGISTER MAPPING SUMMARY
The AC30V 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 AC30 parameter values.
00257 - 00528
00257 - 00528
Reserved area.
Do not write into this register range.
00529 - onwards
00529 - onwards
Fixed mapping to AC30V parameter values.
