Rockwell Automation Publication CC-QS034C-EN-P - March 2015 47
Appendix A
PowerFlex Compact-class User-defined Function Block
This appendix describes the available user-defined function block and the associated inputs and outputs.
RA_PFx_MODBUS_STS_CMD User-defined Function Block
This user-defined function block (UDFB) sends commands to and provides status from a PowerFlex Compact-class AC
drive using Modbus RTU messaging over RS-485. This UDFB has been tested with up to eight drives within one project.
The measured drive start/stop response times for eight drives (at 19,200 baud) in a 100 sample test varied from 40...440
milliseconds.
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