Rockwell-automation 2080-LC50 Getting Started with Motion Control Usin Manual de usuario descargar pdf (Pagina 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.

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Rockwell-automation 2080-LC50 Getting Started with Motion Control Usin Manual de usuario Pagina 76