6 Modbus/TCP interface
The frequency inverter can be controlled by a PLC or another master device via an Ethernet interfaces
using the Modbus/TCP protocol.
When a Modbus/TCP or Modbus/TCP-2P communication module is used, you can also access the fre-
quency inverter using the VPlus software via Ethernet. VPlus can be used in parallel with a PLC with
Modbus/TCP communication.
This document does not provide basic information about Ethernet interfaces. Basic
knowledge of the Modbus/TCP protocol and Ethernet interfaces is required.
In some sections, setting and display options via the PC software VPlus are described as
an alternative to the control unit. In this case, VPlus communicates with the frequency
inverter via a serial interface or a direct Ethernet connection.
WARNING
With Modbus/TCP communication, controllers can access all parameters of the fre-
quency inverter.
Changing parameters the function of which is unknown can result in malfunction
frequency inverter and dangerous situations in the plant.
When values are to be written cyclically at a high repetition rate, no entries shall be
made in the EEPROM, as this only allows a limited number of write cycles (approx. 1
million cycles). If the number of permissible write cycles is exceeded, the EEPROM w
be damaged. See chapter 8.1 “Handling of datasets / cyclic writing of parameters”.
10/13
ACU
Modbus/TCP 21
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