Rockwell Automation Publication 1766-UM001O-EN-P - September 2021 201
Appendix F MicroLogix 1400 Distributed Network Protocol
You can choose not to re-trigger the hold timer for each new event detected by
setting Status Bit S:36/12 to 1 before downloading to the controller. The default
state of this Status Bit S:36/12 is 0.
Number of Class2 Events
If the controller is configured not to initiate Unsolicited Response, this
parameter used to limit the maximum number of events which is generated
and logged into the event buffer for Class 2 events. In this case, value 0 will
disable to generate the event.
If the controller is configured to generate Unsolicited Response, and the
number of queued Class 2 events is reached to this value, Unsolicited Response
is initiated.
The valid range is 0…6013 or 0…10000.
See DNP3 10K Event Logging
on page 250. Default value is 10.
Hold Time after Class2 Events (x1 s)
This parameter is only for Unsolicited Response. The controller holds the
events during Hold Time after Class2 Events (x1 s) before initiating an
Unsolicited Response.
The valid range is 0…65535. Default value is 5.
The value of 0 indicates that responses are not delayed due to this parameter.
Note that parameters Number of Class2 Events and Hold Time after Class2
Events (x1 s) are used together so that if either one of the criteria are met, an
Unsolicited Response is transmitted.
By default, the Hold time is re-triggered for each new event detected.
You can choose not to re-trigger the hold timer for each new event detected by
setting Status Bit S:36/12 to 1 before downloading to the controller. The default
state of this Status Bit S:36/12 is 0.
Number of Class3 Events
If the controller is configured not to initiate Unsolicited Response, this
parameter used to limit the maximum number of events which is generated
and logged into the event buffer for Class 3 events. In this case, value 0 will
disable to generate the event.
If the controller is configured to generate Unsolicited Response, and the
number of queued Class 3 events is reached to this value, Unsolicited Response
is initiated.
The valid range is 0…6013 or 0…10000. See DNP3 10K Event Logging on
page 250. Default value is 10.
Hold Time after Class3 Events (x1 s)
This parameter is only for Unsolicited Response. The controller holds the
events during Hold Time after Class3 Events (x1 s) before initiating an
Unsolicited Response.
The valid range is 0…65535. Default value is 5.
The value of 0 indicates that responses are not delayed due to this parameter.
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