Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 395
CIP Objects Appendix A
Number of samples per revolution occupies the first byte, the remaining three
bytes are used for a scaled speed value (speed x 100). This format supports
speed values to 167,772.15 rpm with a resolution of two decimal places.
Example with ‘data on the wire’ of 0x 10DC7DO5:
• 0x 10 = 16 samples per revolution
• 0x 057DDC = 359,900
• RPM = 359,900/100 = 3599 rpm (60 Hz)
Whether the data is asynchronous or synchronous, it can be determined for the
identifier field with use of the following format.
Behavior
Through the object-specific service 0x4C, the data manager object gives access
to historical data (Trend and Alarm). See the normal CM object for access to
'Live' Dynamic data. Also for the Advanced CM data object for access to
dynamically configurable analysis data (such as variable FFT lines) and to the
Transient data manager object for access to stored transient event data.
CM Record Request - Recommendations for Network Side Implementation
The data is returned in multiple packets as an array of records of size
RecordSize - this data amount can be a significant depending on the extent of
the data requested. The recommended way to handle this data transfer is to
store the payload to a file for later retrieval.
Bits Description
0...1 Measurement channel (0, 1, 2, 3) from which the data originates
2 Data source (Transfer path 0 or 1)
3...4 Transfer path 0 data source (0 pre-filter, 1 mid-filter, 2 post-filter)
5...6 Transfer path 1 data mode (bit 5 = 0 asynchronous bit 5 = 1 synchronous then bit 6 indicates
which tacho was used)
7 Associated tacho source from the Normal CM Data Object
8...15 Measurement engineering units (index not CIP code)
16...31 Reserved
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