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IO-Link Master EtherNet/IP Reference Manual: 2000589 Rev. A Chapter 2. Functionality Descriptions - 17
Chapter 2. Functionality Descriptions
This appendix discusses the following:
• 2.1. Event Handling
• 2.2. ISDU Handling on Page 21
2.1. Event Handling
The IO-Link Master event handling is designed to provide real-time updates of event codes received directly
from the IO-Link device. The IO-Link event code:
• Is included in the second 16-bit word of the Input Process Data (PDI) block.
- An active event is indicated by a non-zero value.
- Inactive or no event is indicated by a zero value.
• Two methods are provided to clear an event:
- Enable the Clear Event After Hold Time option.
• The IO-Link Master keeps, or holds, the active event code in the PDI block until the configured Active
Event Hold Time has passed.
• The IO-Link Master then clears the event code in the PDI block and waits until the Clear Event Hold
Time has passed before including another event code in the PDI block.
- Enable the Clear Event In PDO Block option.
• The IO-Link Master monitors the PDO block received from the PLC.
• The IO-Link Master expects the first entry of the PDO block to indicate an event code to be cleared.
• If there is an active event code in the PDI block and the PDO block both contain the same event
code, the event code is cleared in the PDI block.
• The IO-Link Master then clears event code in the PDI block and waits until the Clear Event Hold
Time has passed before including another event code in the PDI block.
• The two methods can be used separately or together to control clearing of events.
The next subsections illustrate the event clearing process for the various event configurations.