Transmit process data methods, Plc-writes – Comtrol IO-Link Master EIP-4 User Manual
Page 11
IO-Link Master EtherNet/IP Reference Manual: 2000589 Rev. A
Chapter 1. EtherNet/IP Interface - 11
Class 1 Connection (Input Only)-PLC and IO-Link Master Utilize an I/O Connection
1.2.1.3. Class 1 Connection (Input Only)-PLC and IO-Link Master Utilize an I/O Connection
Also called I/O Mode for some industrial protocols, the Class 1 connection method requires the IO-Link
Master and PLC to connect to each via an I/O connection. For EtherNet/IP, a connection over UDP must first
be created. Once the connection is established, the IO-Link Master continually sends input data to the PLC at
a PLC configurable rate.
1.2.2. Transmit Process Data Methods
The IO-Link Master supports the following transmit process data methods:
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1.2.2.2. Read-from-Tag/File-IO-Link Master Reads Data from PLC Memory
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1.2.2.3. Class 1 Connection (Input and Output)-PLC and IO-Link Master Utilize an I/O Connection
1.2.2.1. PLC-Writes
Also called Slave-Mode for some industrial protocols, the PLC-Writes method requires the PLC to send data
to the IO-Link Master via write messages.
1.2.2.2. Read-from-Tag/File-IO-Link Master Reads Data from PLC Memory
Also called Master-Mode for some industrial protocols, the Read-from-Tag/File method requires the IO-Link
Master to read data from a tag or file on the PLC. In this method, the IO-Link Master requests data from the
PLC at configurable time intervals.