11. Connection to other devices11.4 Modbus TCP11.4 Modbus TCPOnly possible with easySoft 7.11.4.1 GeneralModbus TCP is a simple communication protocol that uses a client-server architecturein 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 isbased on TCP/IP and Ethernet, any device that supports the Internet protocol suite andfeatures an Ethernet port can implement it.During communications, data is written as a payload in TCP/IP packets and transmittedthis 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 productsl That are not found in a NET grouporl That do not implement NETThe most important functions include, but are not limited to:l Communications at the control levell Transmitting analog and digital values to higher-level control systemsl Platform-independent communicationl Communication with devices that are not part of the easyE4 serieseasyE4 11/18 MN050009 EN www.eaton.com 545
