Comtrol IO-Link Master EIP-4 - Manual (Page 10)

10 - Chapter 1. EtherNet/IP Interface IO-Link Master EtherNet/IP Reference Manual: 2000589 Rev. A
Data Transfer Methods
1.2. Data Transfer Methods
The IO-Link Master provides a selection of process data transfer methods and a number of options to
customize the process data handling.
• 1.2.1. Receive Process Data Methods
• 1.2.2. Transmit Process Data Methods on Page 11
1.2.1. Receive Process Data Methods
The IO-Link Master supports the following receive process data methods:
• 1.2.1.1. Polling-PLC Requests Data
• 1.2.1.2. Write-to-Tag/File-IO-Link Master Writes Data Directly Into PLC Memory
• 1.2.1.3. Class 1 Connection (Input Only)-PLC and IO-Link Master Utilize an I/O Connection
1.2.1.1. Polling-PLC Requests Data
Also called Slave-Mode for some industrial protocols, the polling method requires the controller to request
data from the IO-Link Master via messages. The IO-Link Master does not respond until it receives a request
for data.
1.2.1.2. Write-to-Tag/File-IO-Link Master Writes Data Directly Into PLC Memory
Also called Master-Mode for some industrial protocols, the Write-to-Tag/File method requires the IO-Link
Master to send messages that write data directly into a tag or file on the PLC. The IO-Link Master sends
changed data to the PLC immediately and, optionally, can be configured to also send “heartbeat” update
messages at a regular time interval.