102 Rockwell Automation Publication 2080-UM004C-EN-E - March 2015
Appendix B Quickstart
Execute the Function Block
Operation Sequence
• A rising edge of FBEN causes the function block to start initializing steps.
When Initialized is done, Output Initialized changes to TRUE.
• You can start the feedback process (Start counting) after Initialized is
TRUE. A rising edge of Start will trigger the feedback process.
Please note that if you want to get positioning information, you need to do
following steps to ensure that position information is in sync:
a. Initialize the RA_FDBKAxis function block.
b. Home the PTO axis to be monitored.
c. Once home is done, start the feedback process.
• You can stop/pause the process and clear the MaxDPos and MaxDSpd by
giving a rising edge of Stop. If you want to disable the function block, you
need set it to Stop state first.
• If FBEN is True and you start the feedback process from previous Stop
state, the function block will not be re-initialized. It will resume count
from previous accumulator value.
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