438 Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Appendix A CIP Objects
Behavior
In general,
• You can configure up to four tracking filters per channel.
• They can be configured to track any particular order, including non-
integer values.
• The filter has a constant Q behavior, so it changes or adapts to speed.
• Any combination of the two tacho inputs can be used across a channel.
Some restrictions / special considerations do apply for specific measurements
and applications.
For Aeroderivative application types (80 and 83) the following fixed
assignment must be configured:
• order 0 set to T0 and 1x
• order 1 set to T1 and 1x
This assignment provides fixed (5 Hz) bandwidth tracking filters for the gas
generator 1x and power turbine 1x. It is not necessary to configure the Mode or
Filter Definition parameters specially to achieve this result.
The Not-1X measurement setting implements:
• order 0 at 1x (either tacho can be used)
• configure the order and the overall (0) to use the same measurement
units
The Not-1X measurement then provides the difference between the Overall
(1) measurement and the first order result.
The Not 1X measurement data is presented in the same detection type as the
order measurement, it does not rely on the overall (1) being configured
similarly.
The Not-1X measurement can if desired provide a ‘Not-2x’ indication, by
simply changing the order configuration of the first tracking filter on any
particular channel. The 'Not-1X' is calculated whenever the first tracking filter
is enabled, irrespective whether it is configured for order 1 (1x).
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