RSTi-OM User Manual
Section 13
GFK-3212A
Jun 2021
Functionality Descriptions
133
13.2
Event Handling
The IOLM 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 IOLM keeps or holds, the active event code in the PDI block until the configured
Active
Event Hold Time
has passed.
•
The IOLM 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 IOLM monitors the PDO block received from the PLC.
•
The IOLM 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 IOLM 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.
•
The two methods can be used separately or together to control the clearing of events.
The next subsections illustrate the event clearing process for the various event
configurations.
13.2.1
Clear Event After Hold Time Process
Figure 94: Illustrates clearing the event after the hold time process.
`
