200 Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
Appendix F MicroLogix 1400 Distributed Network Protocol
The valid range is 0…32767. Default value is 0. As long as it is set for greater
than 0, the NEED_TIME Internal Indication (IIN1.4) bit are set at startup and
then after every Time Synchronization Interval minutes.
When the parameter Enable Time Synchronization On Start Up Only is
Disabled (Unchecked) and the parameter Time Synchronization Interval
(x1 mins) is configured to 0, IIN1.4 bit is never turned on.
Max Response Size
The controller sends Application Layer frame to fit in Max Response Size. If
the Response packet size is larger than this value, the controller fragments the
Response packet.
The valid range is 27…2048 in bytes. Default value is 2048.
Confirmation Timeout (x1 ms)
When Enable Confirmation is enabled, the controller waits for Application
Layer Confirmation until the Confirmation Timeout (x1 ms) has expired.
The valid range is 100…65535 in 1 ms increments. Default value is 10000.
Number of Retries
This parameter is only for Unsolicited Response. If this value has the
maximum which is 65535, it means infinite retries of the Unsolicited Response.
The valid range is 0…65535. Default value is 0.
Number of Class1 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 1 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 1 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 Class1 Events (x1 s)
This parameter is only for Unsolicited Response. The controller holds the
events during Hold Time after Class1 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 Class1 Events and Hold Time after Class1
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.
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