9.8 Modbus TCP
Modbus is an internaonally approved, asynchronous, serial communicaon protocol,
designed for commercial and industrial automaon applicaons.
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Detailed informaon on the Modbus can be found on the web page of the internaonal
Modbus Organizaon, USA, who also further develop the Modbus protocol: hp://
www.modbus.org
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Informaon about the dimensioning of a Modbus network can be found in the congura-
on document for the inverter.
Precondions
Control unit (CU) of the inverter is equipped with Modbus TCP.
9.8.1 Introducon
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The process of data transmission disnguishes between three dierent operang modes:
Modbus ASCII, Modbus RTU and Modbus TCP/IP. This chapter describes the Modbus
TCP/IP operang mode.
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The Modbus protocol is based on a master/slave architecture where the inverter always
works as slave.
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In the Modbus TCP/IP network, a master can only address one slave at a me. However,
several masters can be available in the network.
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Only a master can iniate the Modbus communicaon.
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No direct communicaon takes place between the slaves.
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The network opon supports the baud rates 10 Mbps (10 BaseT) and 100 Mbps
(100 BaseT). The baud rate in the network is automacally detected.
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The inverter supports the funcon codes 3, 6, 16 (0x10) and 23 (0x17).
Conguring the network
Modbus TCP
Introducon
348
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