Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 473
CIP Objects Appendix A
The identifier structure contains coded information recording the source
(pertaining to filters), mode (asynchronous or synchronous), related tacho
source, and engineering units for the data. If the mode is indicated as being
synchronous, the SamplePeriodInSecs field contains the number of samples per
revolution.
Behavior
Through the Object-specific service 0x4C, the Normal CM Object gives access
to 'Live' Dynamic data. See the Data Manager Object for access to historical
data (Trend and Alarm). See the Advanced CM Data Object for access to
dynamically configurable analysis data (variable FFT lines, and so on) and the
Transient Data Manager Object for access to stored transient event data.
In general this object supports multi-user access, however, the live data option
is single user only. In such a case, error code 13 is returned to any subsequent
requestor [eLiveMeasurementInProgress] and that software must resubmit the
request.
Table 211 - Tacho (eTACHO)
Byte Offset
Within
Structure
Structure Member Data
Type
Description
0 TimestampNanoSec UDINT Sub-second accuracy.
4 TimestampSec UDINT Seconds since 1970.
8Reserved REAL
12 Reserved DWORD
16 Reserved UDINT
20 ByteCount UDINT The size of the following array in bytes.
24 TimingArray UDINT The array of tacho time values (24 bit, micro-second
counter).
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