Modbus/TCP – Communication protocol 95
6
Modbus/TCP –
Communication protocol
Contents of this chapter
This chapter describes the Modbus/TCP communication protocol
for the adapter module.
Modbus/TCP
Modbus/TCP is a variant of the Modbus family of simple, vendor
neutral communication protocols intended for supervision and
control of automation equipment. Specifically, it covers the use of
Modbus messaging over TCP connection on an IP network.
The FENA adapter module acts as a Modbus/TCP server with
support for the ABB Drives and Transparent profiles. The adapter
module also supports Modbus over UDP. The only difference
between Modbus/TCP and Modbus/UDP is that in Modbus/UDP
the transport layer protocol is UDP instead of TCP.
The supported Modbus commands are listed in section
Function
codes
on page
96
. Two simultaneous Modbus/TCP connections
are supported, that is, two clients can be connected to the adapter
module at a time.
Further information on the Modbus/TCP protocol is available at
www.modbus.org
.
Summary of Contents for FENA-01
Page 4: ......
Page 20: ...20 Safety instructions ...
Page 32: ...32 Introduction to the manual ...
Page 38: ...38 Overview of the Ethernet network and the FENA 01 11 21 module ...
Page 42: ...42 Mechanical installation ...
Page 46: ...46 Electrical installation ...
Page 48: ......
Page 94: ...94 Modbus TCP Communication profiles ...
Page 106: ...106 Modbus TCP Communication protocol ...
Page 112: ...112 Modbus TCP Diagnostics ...
Page 114: ......
Page 154: ...154 EtherNet IP Start up 3 In the Select Module window select ETHERNET MODULE ...
Page 180: ...180 EtherNet IP Communication profiles ...
Page 246: ......
Page 304: ...304 PROFINET IO Start up ...
Page 374: ...374 AppendixA PROFIdriveparametersandI MrecordsofPROFINETIO ...