Engineering Units (Engunits Data Type) - Allen-Bradley 1444-TSCX02-02RB User Manual

Appendix A CIP Objects
330
Follow these steps to process one, continuous time waveform. This process
assumes that overlap samples can be communicated to the personal computer
and can be processed quickly enough.
1. Verify that the two time waveforms overlap.
Check that the ending time (Sample Time + TWF Period) of the first
TWF is greater than the sample time of the second TWF.
2. Calculate the position of the second TWF RelativeTime in the first
TWF.
This value is calculated as the difference in the TWF RelativeTime
divided by the Sample Period in Microseconds.
3. In a new buffer, copy the samples from the first TWF up to the
calculated position of the second TWF.
4. Copy the samples from the second TWF beginning at this sample
number.

Engineering Units (ENGUNITS Data Type)

The Dynamix 1444 series supports the engineering units that are listed on
448. Each unit is assigned a specific value, which is what is used to populate the
member of the configuration assembly, so is communicated to the module. In
the CIP Library, all attributes of type ENGUNITS require a value, as shown.
IMPORTANT If the engineering unit values must be set programmatically, take care to
confirm that the sensor units and subsequent converted or integrated units
are consistent with the functionality allowed and the implemented
configuration. We recommend that the desired unit entries be modeled
using the AOP first to confirm that the desired unit is allowed given the
specific configuration.
Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
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