IAI America XSEL Ethernet - Manual (Page 16)

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A hierarchy of the functions provided by the X-SEL Ethernet option is shown below.
Functions are selected by parameters. Additionally, the network environment parameters must be set.
EXCEPTION status invalid
EXCEPTION status (upper two digits of the error number) valid
Client (PC software connection enabled)
Server
Client
Server
EtherNet/IP
Message communication
IAI protocol B/TCP
Adapter (equivalent to a slave)
Transmission by SEL program (4 channels)
Ethernet option
Remote I/O
Server (slave unit)
Modbus/TCP