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Appendix A
CIP Objects
424
Attribute Semantics
Enabled Instances
The following bit-coding scheme is used to identify active static AC
measurement instances. Three bytes are used to describe active instances for
each subchannel.
Byte
Bit
Description
1
0...7
AC measurement instances 1...8
0. disabled
1: enabled
2
0...7
Reserved for full multiplexing
3
0...7
Reserved for full multiplexing
Disabled instances return error 0x08 (Service Not supported) when disabled
instances are addressed with common services.
Source Selection
For the overall AC measurement A, the source is fixed (the level assessment is
made after the user configured low and high pass filters). For the overall AC
measurement B, the source is variable.
Index
Source
1
Pre-Filter - before the user configured low pass filter
2
Mid-Filter - after the user configured low pass filter
Source selection for the overall AC measurement B configures the dual path
processing capability for that channel, so that:
• in an integrating configuration, both acceleration and velocity overalls
are available
• or in a non-integrating configuration to have both band pass filtered and
wide band data available.
AC Units
Actual selection of AC engineering units are 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).
Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
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