Comtrol IO-Link Master EIP-4 - Manual (Page 9)

IO-Link Master EtherNet/IP Reference Manual: 2000589 Rev. A Chapter 1. EtherNet/IP Interface - 9
Terms and Definitions
1.1.3. Terms and Definitions
This section uses the following terms and definitions.
Term Definition
Class 1
Otherwise called implicit messaging, is a method of communication
between EtherNet/IP controllers and devices that:
• Uses Ethernet UDP messages.
• Is cyclic in nature. Input and/or output data is exchanged between
the controllers and devices at regular time intervals.
Class 3
Otherwise called explicit messaging, is a method of communication
between EtherNet/IP controllers and devices that:
• Uses Ethernet TCP/IP messages.
• By itself is not cyclic in nature. The controller and devices must send
individual messages to each other.
EtherNet/IP
An Ethernet based industrial communication protocol utilized to
communicate between controllers, often times PLCS, and devices.
Ethernet TCP/IP
Standard Ethernet communications protocol utilizing socket
communication interfaces that guarantees delivery to the intended
device.
Ethernet UDP/IP
Standard Ethernet communications protocol utilizing socket
communication interfaces that does not guarantee delivery. The data
may or may get to the intended device.
IO-Link Master
IO-Link gateway that provides communication between IO-Link devices
and Ethernet protocols such as EtherNet/IP and Modbus/TCP.
Multicast
Multicast addressing involves Ethernet devices sending messages to each
other using a multicast address. Multicast addressing:
• Uses a specified IP address range designated for multicast
communication.
• Allows either one or multiple devices to receive the same messages.
Point-to-Point
Point-to-Point, otherwise called unicast, addressing involves Ethernet
devices sending messages directly to each other using their own IP
addresses. Messages are sent to only one device.
PDI data
(Process Data
Input)
Process data received from an IO-Link device or I/O interface that can be
provided to external controllers such as PLCs, HMIs, SCADA, and OPC
Servers.
PDO data
(Process Data
Output)
Process data received from external controllers such as PLCs, HMIs,
SCADA, and OPC Servers and sent to an IO-Link device or I/O interface.
Note: IO-Link devices may or may not support PDO data.
ISDU
Service Process Data Unit. Otherwise called ISDU, refers to the Service
Data units on IO-Link devices that are used for information, status and
configuration settings.
ISDU
Indexed Service Data Unit. Otherwise called ISDU, refers to the Service
Data units on IO-Link devices that are used for information, status and
configuration settings.
Class 1
Otherwise called implicit messaging, is a method of communication
between EtherNet/IP controllers and devices that:
• Uses Ethernet UDP messages.
• Is cyclic in nature. Input and/or output data is exchanged between
the controllers and devices at regular time intervals.