Clear all data from the module buffer at once, Propagate a signal from input pin to ethernet – Rockwell Automation 1732E-OB8M8SR EtherNet/IP Dual Port 8-Point SOE Input and Scheduled Output Modules UM User Manual
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Rockwell Automation Publication 1732E-UM003B-EN-E - March 2014
Chapter 10 Use the Sequence of Events Input and Scheduled Output Modules
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Clear All Data From the Module 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 buffers, all of the module input tags return to 0.
To reset events in the module 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 timestamp 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 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 it takes the module to acquire a timestamp
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 acquires the
"firmware delay time" after the input changes state at the module
microprocessor. The input filter simply delays 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.