Rockwell Automation 1732E-IB16M12SOEDR EtherNet/IP ArmorBlock supporting Sequence of Events - Manual (Page 75)

Publication 1732E-UM002A-EN-P - March 2010
Using the Module 67
Clear All Data From the
Module’s Buffer At Once If necessary, you can reset the events in the module, in effect clearing all data
from previously timestamped transitions. In other words, when all data is
cleared from the module’s buffers, all of the module’s input tags return to 0.
To reset events in the module’s buffer, transition the O.ResetEvents tag to 1 as
described below:
• If the bit = 0, change the bit to 1.
• If the bit = 1, change the bit to 0, wait for at least one RPI, and change
the bit to 1.
Once the data is cleared, the module begins timestamping input transitions
again and storing them in its on-board buffer.
Propagate a Signal From
Input Pin to EtherNet The module receives a signal at its input pin and processes it internally before
sending the input and time stamp data to the controller at the Requested
Packet Interval (RPI) via EtherNet.
When you operate the module, you must account for signal propagation delays
that exist during internal processing. Some of these delays are inherent to the
module and others are controlled by temperature and input voltage.
During processing, the following delays exist:
• hardware delay – The time it takes an input signal to propagate from the
module’s input pin to its microprocessor. This time varies according to
input transition type (OFF to ON/ON to OFF), input voltage and
temperature.
• firmware delay time – The time is takes the module to acquire a time
stamp once its microprocessor receives the input signal.
• input filter delay – user-configurable number from 0…16 ms. The input
filter does not affect when the timestamp is acquired. It is acquired the
"firmware delay time" after the input changes state at the module's
microprocessor. The input filter simply delay's the amount of time the
input must be in a certain state before input is considered valid and the
timestamp data will be sent to the controller.
• RPI – Once the timestamp is acquired by the microprocessor and the
input is filtered, the input and timestamp data is sent to the controller at
the next RPI.