ELAP MEM440-Bus, Инструкция по эксплуатации

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MEM-BUS
EtherNet/IP™ ENCODER
Instruction Manual
ENIP_Manual_ENG 17/07/2018
5
EtherNetIP uses TCP/IP ( T ransmission C ontrol P rotocol) and UDP/IP ( U ser D atagram P rotocol) for
communication.
Implicit messaging is used for real-time communication between a programmable logic controller (PLC) and
the encoder in EtherNet/IP. With implicit messaging a connection is established between exactly two
devices within the CIP™ protocol to transfer, for example, I/O data such as position and velocity from the
encoder to the PLC. Implicit messaging uses UDP/IP via port 2222. As a result, a fast data rate is used.
Explicit messaging is used in EtherNet/IP for communication that does not need to take place in real time; it
is used, for example, to transfer parameters from the PLC to the encoder. Explicit messaging uses TCP/IP.
Devices that originate or use data on the network have factory-assigned media access control (MAC)
addresses for unique identification. The MAC address (MAC ID) consists of 6 bytes. The first three bytes
identify the manufacturer. The last three bytes are unique to the device.
The MAC address of ELAP MEM-BUS encoders is 60-D7-E3-1x-xx-xx.
EtherNet/IP is based on the standard Ethernet frame, which consists of the Ethernet header, the Ethernet
data, and the Ethernet trailer. The MAC IDs of the receiver (destination address) and of the source (source
address) are contained in the Ethernet header.
The Ethernet data field consists of several nested protocols:

The IP datagram is transported in the user data of the Ethernet data field.

The TCP segment or the UDP datagram is transported in the user data of the IP datagram.

The CIP™ protocol is transported in the user data of the TCP segment or the UDP datagram.
CIP™ is a message-based protocol that implements a relative path to send a message from the “producing”
device to the “consuming” devices. The producing device contains the path information that steers the
message along the proper route to reach its consumers. Because the producing device holds this
information, the other devices along the path simply pass it, without any need to store it.