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ATV312 - How to use logic inputs for up and down speeds

How can I program the drive to use logic inputs to speed up and down the motor?

Product line:
Altivar 312  

All models, all serial numbers   

No information given

Program the following parameters
LAC= L2 or L3            Access Level
rFC= Fr2                      Ref. 2 switching
USP= LI3                     (+) speed assign.
dSP= LI4                     (-) speed assign.
Fr2= Updt                    Reference 2 Channel 
When LI3 is enabled the motor will speed up.
When LI4 is enabled the motor will slow down.  
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