Rockwell Automation Publication 520-UM001I-EN-E - July 2016 209
Appendix D
Velocity StepLogic, Basic Logic and Timer/
Counter Functions
Four PowerFlex 520-series logic functions provide the capability to program
simple logic functions without a separate controller.
• Velocity StepLogic™ Function (specific to PowerFlex 525 drives only)
Steps through up to eight preset speeds based on programmed logic.
Programmed logic can include conditions that need to be met from digital
inputs programmed as “Logic In 1” and “Logic In 2” before stepping from
one preset speed to the next. A timer is available for each of the eight steps
and is used to program a time delay before stepping from one preset speed
to the next. The status of a digital output can also be controlled based on
the step being executed.
• Basic Logic Function (specific to PowerFlex 525 drives only)
Up to two digital inputs can be programmed as “Logic In 1” and/or “Logic
In 2”. A digital output can be programmed to change state based on the
condition of one or both inputs based on basic logic functions such as
AND, OR, NOR. The basic logic functions can be used with or without
StepLogic.
• Timer Function
A digital input can be programmed for “Timer Start”. A digital output can
be programmed as a “Timer Out” with an output level programmed to the
desired time. When the timer reaches the time programmed into the
output level the output will change state. The timer can be reset with a
digital input programmed as “Reset Timer”.
• Counter Function
A digital input can be programmed for “Counter In”. A digital output can
be programmed as “Counter Out” with an output level programmed to the
desired number of counts. When the counter reaches the count
programmed into the output level the output will change state. The
counter can be reset with a digital input programmed as “Reset Counter”.
Use the Wizard in Connected Components Workbench to simplify setup instead
of manually configuring the parameters.
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