428 Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Appendix A CIP Objects
Output Enable
Transducer disabled status overrules enabled channel processing setup.
DC Units
Actual selection of DC engineering units is a subset of the master engineering
units list. The selection is based on active measurement application for the
applicable measurement channel (related to sensor type and signal processing).
Rod Drop Configuration
Rod-drop processing is assessed in parallel to normal DC measurements. Rod
drop units of measurement is the same as the configured DC Measurement
units.
Instance must be active and rod-drop function must be enabled to obtain
access to the rod-drop measurement value.
Trigger Source
The following section explains the rod-drop functionality in more detail:
• The rod-drop functionality is enabled / disabled by virtue of the selected
channel application type. If the rod drop application has been selected,
then for the configuration to be legitimate, an appropriate tacho source
must be selected. If the rod drop application is not selected, then the
setting of the trigger source is irrelevant. For example, in those
circumstances, 0x00/Off can be used but does not have to be used.
• The rod-drop measurement is made every revolution. except in the case
where the configured measurement range encompasses the trigger point
itself. In that situation, the measurement is made every other revolution.
• The rod-drop measurement is only applicable at speeds greater than 10
rpm. Below 10 rpm the measurement defaults to a normal DC
measurement (although the configured rod-drop TC not the DC TC
still apply). This measurement also provides a means by which rod drop
'mode' is exited if the tacho pulses suddenly stop.
Option Description
0x00 Rod-drop disabled
0x01 Tacho/Speed 0
0x02 Tacho/Speed 01
Higher Values Reserved
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