11. Connection to other devices
11.4 Modbus TCP
11.4 Modbus TCP
Only possible with easySoft 7.
11.4.1 General
Modbus TCP is a simple communication protocol that uses a client-server architecture
in order to make it possible for measuring and control systems (server) to com-
municate with higher-level control systems (client) and vice versa. Since the protocol is
based on TCP/IP and Ethernet, any device that supports the Internet protocol suite and
features an Ethernet port can implement it.
During communications, data is written as a payload in TCP/IP packets and transmitted
this way.
Please note that the easyE4 will only assume the functionality of a lower-
level Modbus TCP server, and not the higher-level client functionality.
Modbus TCP ensures communications with devices:
l That do not necessarily have to be part of the easyE4 family of products
l That are not found in a NET group
or
l That do not implement NET
The most important functions include, but are not limited to:
l Communications at the control level
l Transmitting analog and digital values to higher-level control systems
l Platform-independent communication
l Communication with devices that are not part of the easyE4 series
easyE4 11/18 MN050009 EN www.eaton.com
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