Rockwell Automation 2080-LC50 Getting Started with Motion Control Using a Simulated Axis - Manual (Page 76)

66 Publication 2080-QS001A-EN-E - January 2013
Chapter 5 Execute Your Motion Control Function Blocks
Execute MC_MoveVelocity and MC_Halt
The MC_MoveVelocity function block commands a never ending axis to move at a specified velocity until the hard or soft
limit is reached.
Before execution, the MC_MoveVelocity program should appear as shown.
TIP Velocity can be a signed value. Users are advised to use positive velocity.
Direction input for the MC_MoveVelocity function block can be used to define the direction of the move
(that is, negative velocity x negative direction = positive velocity).
TIP For MC_MoveVelocity, direction input value can be 1 (positive direction), 0 (current direction) or -1
(negative direction).
For any other value, only the sign is taken into consideration. For example, -3 denotes negative direction,
+2 denotes positive direction, and so on.
For MC_MoveVelocity, the resulting sign of the product value derived from velocity x direction decides the
motion direction, if the value is not 0. For example, if velocity x direction = +300, then direction is positive.